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DATE OF LAST REVISION: 11/01/10

MANUFACTURERBostik, Inc.211 Boston StreetMiddleton, MA 01949-2128 USACustomer or Technical Service: 1-800-7/BOSTIKTechnical Fax: (215) 957-0716www.bostik-us.com

PRODUCT DESCRIPTIONChem-Calk 900 sealant is a one-component, architecturalgrade, polyurethane sealant capable of dynamic jointmovement totaling 50% of original joint geometry (±25%).The sealant cures to a tough, flexible rubber when exposedto moisture present in the atmosphere.Chem-Calk 900 polyurethane sealant has a consistencylike toothpaste, its physical properties will remain relativelystable over time and in varying weather conditions. Itsphysical properties are relatively unchanged over a widetemperature range, -40°F to 150°F (-40°C to 66°C).Where textured appearance is needed, please useBostik® Chem-Calk® 916.

APPLICABLE STANDARDSn ASTM C920, TYPE S, GRADE NS, CLASS 25, USE

NT, A AND M. n US Federal Specification TT-S 00230C (COMB-

NBS) for one-component sealants as Type II, ClassA, Non-Sag.

n Canadian Specification CAN/CGSB 19.13-M87.n CARB and SCAQMD Compliant.n Meets VOC Requirements for OTC Regulation.

BASIC USESn Designed for sealing expansion and control joints

in pre-cast concrete panels and metal curtainwalls; perimeter sealing of door and windowframing and other building components.

n Sealant cures to form a durable, flexible bond withmost building materials in any combinationincluding stone, masonry, ceramic, marble, wood,steel, aluminum and many plastics.

FOOD STATUSChem-Calk 900 sealant is acceptable for use inconstruction and repairs that may result in incidentalcontact with food in USDA inspected meat and poultryplants. FDA 175.105.

Chem-Calk® 900ONE-COMPONENT, POLYURETHANE ELASTOMERIC. ARCHITECTURAL GRADE

TABLE 1: CHEM-CALK® 900TYPICAL UNCURED PROPERTIES*

Property Value Test Method/Note

Tool/Work Time 70 min. Bostik Test MethodSkin Time 6 hrs. TT-S-00230C/ASTM C 679Curing Time @ 77°F 3 - 7 days Varies w/ relative humidityFlow, Sag or Slump 0.1 inch TT-S-00230C/ASTM C 639Staining None TT-S-00230C/ASTM C 510

TABLE 2: CHEM-CALK® 900TYPICAL CURED PROPERTIES*

(After 14 days cure at 77˚F and 50% RH)

Property Value Test Method/Note

Hardness (Shore A) 38 ASTM D 2240Modulus @ 100% Elongation 70 psi ASTM D 412Tensile Strength @ Break 180 psi ASTM D 412Elongation @ Break 950% ASTM D 412Adhesion Peel >35 piw TT-S-00230C/ASTM C 794Joint Movement Capability +25% TT-S-00230C/ASTM C 719UV Resistance Pass ASTM C 793* Values given above are not intended to be used in specification preparation.

FEATURES & BENEFITSn Superior Adhesion to Most Helps Maintain a Weatherseal to Common Building Materials Seal Out the Elementsn Unprimed Adhesion / Easy Gunning One-Step installation / Installer Friendlyn CARB and SCAQMD Compliant Can be used anywhere within the USA

TABLE 3: CHEM-CALK®¨ 900ASTM C-794 ADHESION-IN-PEEL

TO COMMON CONSTRUCTION SURFACES1

Surface lbs. / Inch Failure Type – %

Mill Finished Aluminum2 10 Adhesive – 100Anodized Aluminum >35 Cohesive – 100Steel2 15 Adhesive – 100Galvanized Steel >35 Cohesive – 100Stainless Steel2 11 Adhesive – 100Fiberglass 31 Cohesive – 100ABS2 16 Adhesive – 100Rigid PVC2 10 Adhesive – 100Plywood3 >35 Cohesive – 100Concrete3 >32 Cohesive – 100Brick >35 Cohesive – 100Granite >35 Cohesive – 100Marble2 >10 Adhesive – 100Limestone3 >35 Cohesive – 1001 Values given above are not intended to be used in specification preparation.2 With primer, value is >30, Cohesive—100.3 Peel values are reduced when unprimed samples are water-reduced.

T E C H N I C A L D A T A S H E E T

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APPLICATION LIMITATIONSn Construction substrates have become complex and diverse by

nature and origin. Substrate chemistries and structures caninterfere with adhesive performances of the sealant. Adhesion toSubstrate Pretest (ASP) is therefore MANDATORY to assess anyadhesion and sealing characteristics—see Adhesion toSubstrates Pretest section and see Installation Protocol section.This must be done pre-installation to avoid potential failures.Call Technical Service for more information about surfacepreparation and possible priming.

n Do not apply over damp, contaminated, loose surfaces (SeeInstallation Protocol and Surface Preparation), old sealants orother foreign substances that may impair the adhesion bond.Avoid air entrapment.

n Dampness and substrates with high moisture will triggerextensive curing of the sealant within a very short period of time.This may cause an excess of bubbling and foaming within thesealant and at the bottom of the bead.

High temperture/humidity can cause the sealant to developbubbles during the curing process.

Sealant installation is not recommended when the dew point ofthe substrate is close to ambient temperature or a moisture-vaportransmission condition is present increasing the potential forbubbling to form during cure.

Porous substrates such as, but not limited to, marble, limestoneand granite might absorb components of the Chem-Calk 900leading to staining of the substrate. ASP with sufficient agingis mandatory to assess this potential issue.

n The ultimate performance of Chem-Calk 900 depends on properjoint design and proper application with joint surfaces properlyprepared (See Installation Protocol—Joint Design section.)Bostik Chem-Calk 900 is not recommended for joints withdimension less than or greater than what is recommendedbelow. (See Installation Protocol—Joint Design section.)

n Chem-Calk® 900 must not be used to seal narrow joints, filletjoints and face nail holes.

n Smearing and feathering Chem-Calk® 900 over joints is notrecommended.

n Chem-Calk® 900 is not recommended for horizontal joints ortraffic-bearing joints where abrasion resistance is required(walkways, driveways, runways, etc.). Please refer to Chem-Calk®955-SL for this application.

n Chem-Calk 900 is not recommended for continuous immersion inwater or any other fluid. When fully cured, avoid exposure, evenincidental, to fuels, chlorinated, acid and alkaline solutions. Chem-Calk 900 is not recommended for exterior or interior sealingbelow the waterline; please refer to Bostik® 940 Fast Set formarine applications.

n Contact of Chem-Calk 900 with asphalts (i.e., back coating ofwindow flashing, etc.) and other filler compounds impregnatedwith oil, asphalt, tar, etc., may deteriorate the cohesive strengthof the substrate and ultimately compromise the seal.

n During the curing of Chem-Calk 900, do not expose to curingsilicone sealants, curing Chem-Calk® 2000 or Chem-Calk®2020, alcohol, acids or solvent-based materials.

n Compatibility to copper-based substrates (i.e., flashing) can varydue to, but not limited to, age and joint size. Please consultTechnical Service for details.

n Lower relative humidity and temperature will significantly extendthe curing time. Confined areas, deep joints and moisture barriersubstrates may also affect the full cure time and extend it bymany days.

n Until the sealant is fully cured, do not expose the sealant to anymechanical stress. Uncured sealant will not respond properly tocyclic expansion and contraction of the joint specified for thecured sealant only.

n Chem-Calk 900 is not recommended for glazing applications.Bond line strength can be affected by UV rays through the clearmaterial (glass, acrylic glass, polycarbonate, etc.)

n Chem-Calk 900 is not RTV silicone and therefore is suitable forpainting with latex based paints. Paint chemistries and flexibilitycharacteristics of the paint films over the sealant may affectwetting, adhesion and integrity of the paint layer; and it istherefore mandatory to pretest the paint or other coating overthe Chem-Calk 900 to ensure the successful compatibilitybetween the sealant and the paint/coating after a sufficientamount of time. See your paint manufacturer for specificationsand limitations and call our Technical Service for moreinformation. In general, oil-based paints are not recommendedbecause of their poor elastic properties and because of theirpotential interaction with the sealant chemistry, which maycreate non-curing conditions for the sealant. Do not paint overthe polyurethane sealant until it has fully cured.

n The surface of a Chem-Calk 900 seal when exposed to UV raysand sunlight will yellow and not retain its gloss. Thisphenomenon can occur within a few weeks after exposure. Thechange of color is limited to the surface layer of the seal andshould not compromise the sealing properties of the Chem-Calk900 if the dimensions of the joint are proper and the sealant isotherwise properly applied. In areas where color retention iscritical, please refer to Bostik® Chem-Calk® 2000 and 2020.Chem-Calk 900 may remain tacky for a few hours and attractdust and dirt from the jobsite which may affect the appearanceof the sealant. Check tack-free time to prevent dirt pickup.

INSTALLATION PROTOCOLJoint Design:In general, more joint movement can be accommodated in a thin beadof sealant than a thick bead. Chem-Calk 900 polyurethane sealantshould be no thicker than 1/2" (12.7mm) and no thinner than 1/4"(6.4mm). In joints between 1/2" and 1", the ratio of sealant width todepth should be approximately 2:1. Sealant depth in joints between1/4” and 1/2" should be 1/4" deep. Joints with dynamic movementshould not be designed in widths less than 1/4".Surface Preparation:See limitations about surface preparation. Surfaces must bestructurally clean, dry (no frost) and structurally sound, free ofcontaminants, including but not limited to dust, dirt, loose particles, tar,asphalt, rust, mill oil, etc. If substrate is painted or coated, scrape awayall loose and weakly bonded paint or coating. Any paint or coating thatcannot be removed must be tested to verify adhesion of the sealant orto determine the appropriate surface preparation if needed. (See ASPsection on next page for details.)To remove laitance and any other loose material, clean concrete,stone or other masonry materials with nonalcoholic-based solvent bywashing, grinding, sandblasting or wire brushing as necessary. Do notuse water to clean substrates. Dust must be thoroughly removed aftercleaning.

Alcohol is not compatible with polyurethanes and its use can causeirreparable damage to the sealant. If alcohol is used as a cleaningsolvent, all traces of alcohol must thoroughly be removed prior to theinstallation of the polyurethane sealant. Lastly, alcohol is notrecommended as a tooling medium.Backer Rods and Bond Breaker Tapes:Bond breakers, including but not limited to closed-cell polyethylenebacker rods, are used to control depth of the sealant bead, provide afirm tooling surface and avoid three-sided adhesion. Where the depthof joint prevents use of backer rods, a polyethylene strip or tape mustbe used as a bond breaker to prevent 3-sided adhesion. Do not primeor damage the surface of the bond breaker. Refer to instructions givenby rod and tape manufacturers for the correct backer rod and tapesize related to joint size.

Priming:In general, application of Chem-Calk 900 does not require priming thesubstrates. However, some substrates may require a Bostik primer. It isthe user’s responsibility to check adhesion of the cured sealant on typicaltest joints at the project site before and also during application asweather conditions may affect the adhesion results (See ASP section onnext page.). Refer to Bostik Primer product data sheet or call TechnicalService for proper selection and application of Bostik Primers.Tooling:Chem-Calk 900 comes ready-to-use. Cut spout or tip to desired beadsize. Apply moderate pressure to break seal inside the nozzle. Apply byusing a professional caulking gun. Use opened cartridges and sausagesthe same day they are opened. Apply Chem-Calk 900 polyurethanesealant in a continuous operation using positive pressure to the bottomof the joint to properly fill and seal the joint. When applying, avoid airentrapment and overlapping. Tool the sealant before the skin forms withadequate pressure to spread the sealant against the backup material atthe bottom and sides of the joint. A dry tool with a concave profile isrecommended for that operation. Do not use water or soapy water forthis operation. Avoid smearing and feathering of the sealant to allow fullperformance of the cured seam. Excess sealant should be dry-wiped orjoints should be properly taped.Cleaning:After dry-wiping uncured sealant from substrates and tools, remaininguncured sealant can be removed by using Xylene, Toluene or similararomatic solvents. Please refer to the MSDSs provided for these solventsbefore use. Bostik® Hand and Tool towels can also remove uncuredsealant. Cured sealant is usually very difficult to remove without alteringor damaging the surface to which the sealant has been misapplied.Cured sealant can be removed by abrasion or other mechanical means(scrapers, putty knives).Curing Time:Chem-Calk 900 is a moisture cure, polyurethane sealant. On wood,with ambient air at 50% relative humidity and at 73°F, polyurethanesealants will generally skin within four hours and cure 1/16 of an inchper day. Lower temperature and lower relative humidity willsignificantly increase the skin time and cure time of a polyurethanesealant.Painting and Coating:(Refer to bullet 15 under the Application Limitations section.)Maintenance:If the sealant becomes damaged, replace the damaged portion byremoving the old sealant completely, cleaning the surfaces andreapplying a fresh and appropriate amount of new sealant inaccordance with the directions and information contained in this datasheet.

MANDATORY ADHESION TO SUBSTRATES PRETEST— (ASP)A hand pull test must be run before the job starts and at regularintervals during the job. It must be run on the job site after the sealantis fully cured, usually within 7 to 21 days. (Adhesion may develop fullyafter at least 14 days.)The hand pull test procedure is asfollows:1. Make a knife cut horizontally from

one side of the joint to the other.2. Make two vertical cuts approximately

two inches long, at the sides of thejoint, meeting the horizontal cut atthe top of the two-inch cuts.

3. Grasp the two-inch piece of sealantfirmly between the fingers and pulldown at a 90° angle or more, and tryto pull the uncut sealant out of thejoint.

4. If adhesion is sufficient, the sealant should tear cohesively initself.

5. Sealant may be replaced by applying more sealant in the samemanner as it was originally applied. Care should be taken toensure that the new sealant is in contact with the original, andthat the original sealant surfaces are clean, so that a properbond between the new and old sealant will be obtained.

STORAGE • PACKAGING • SHELF LIFEShelf life of Chem-Calk 900 must be checked prior to using theproduct; do not use past its shelf life. Caulk past its shelf life may notperform or adhere as described by this data sheet. High temperatureand high relative humidity may reduce significantly the shelf life ofpolyurethane sealants. If you are unsure of the expiration date ofyour Bostik product, please call customer service at 1-800-7/BOSTIK(1-800-726-7845) to check if the product is still within its shelf life.

COLORSWhite Antique White Tan Med. BronzeBlack Stone Limestone Bronze

AVAILABILITYAvailable from authorized Bostik distributors. Go to www.bostik-us.comand check our distributor locator for the closest distributor in yourlocation or call customer service at 1-800-7/BOSTIK (1-800-726-7845).

HEALTH AND SAFETYPlease refer to the MSDS for First Aid Information. Most currentMSDS’s can be found on Bostik’s website at www.bostik-us.com orcall customer service at 1-800-7/BOSTIK (1-800-726-7845).

TECHNICAL SERVICETECH SERVICE phone number: 1-800-7/BOSTIK (1-800-726-7845).Field visits by Bostik personnel, Bostik manufacturer representativesor Bostik authorized distributor personnel are for the purpose ofmaking technical recommendations only and not for supervising orproviding quality control on the jobsite.

WARRANTY (LIMITED WARRANTY) — IMPORTANT NOTICEAll statements, technical information and recommendations set forthherein are based on tests which Bostik believes to be reliable.However, Bostik does not guarantee their accuracy or completeness.The buyer and/or user should conduct its own tests of this productbefore use to determine proper preparation technique and suitabilityfor proposed application. Any sales of this product shall be on termsand conditions set forth on Bostik’s order acknowledgment. Bostikwarrants that the product conforms with Bostik written specificationsand is free from defects at the time it leaves Bostik’s control. BOSTIKDISCLAIMS ALL OTHER WARRANTIES, EXPRESSED AND/OR IMPLIED,INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE. THE BUYER’S SOLE REMEDY FORNONCOMPLIANCE WITH THIS WARRANTY SHALL BE FOR THEREPLACEMENT OF THE PRODUCT OR REFUND OF THE BUYER’SPURCHASE PRICE. IN NO CASE WILL BOSTIK BE LIABLE FOR DIRECT,CONSEQUENTIAL ECONOMIC OR OTHER DAMAGES.

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APPLICATION LIMITATIONSn Construction substrates have become complex and diverse by

nature and origin. Substrate chemistries and structures caninterfere with adhesive performances of the sealant. Adhesion toSubstrate Pretest (ASP) is therefore MANDATORY to assess anyadhesion and sealing characteristics—see Adhesion toSubstrates Pretest section and see Installation Protocol section.This must be done pre-installation to avoid potential failures.Call Technical Service for more information about surfacepreparation and possible priming.

n Do not apply over damp, contaminated, loose surfaces (SeeInstallation Protocol and Surface Preparation), old sealants orother foreign substances that may impair the adhesion bond.Avoid air entrapment.

n Dampness and substrates with high moisture will triggerextensive curing of the sealant within a very short period of time.This may cause an excess of bubbling and foaming within thesealant and at the bottom of the bead.

High temperture/humidity can cause the sealant to developbubbles during the curing process.

Sealant installation is not recommended when the dew point ofthe substrate is close to ambient temperature or a moisture-vaportransmission condition is present increasing the potential forbubbling to form during cure.

Porous substrates such as, but not limited to, marble, limestoneand granite might absorb components of the Chem-Calk 900leading to staining of the substrate. ASP with sufficient agingis mandatory to assess this potential issue.

n The ultimate performance of Chem-Calk 900 depends on properjoint design and proper application with joint surfaces properlyprepared (See Installation Protocol—Joint Design section.)Bostik Chem-Calk 900 is not recommended for joints withdimension less than or greater than what is recommendedbelow. (See Installation Protocol—Joint Design section.)

n Chem-Calk® 900 must not be used to seal narrow joints, filletjoints and face nail holes.

n Smearing and feathering Chem-Calk® 900 over joints is notrecommended.

n Chem-Calk® 900 is not recommended for horizontal joints ortraffic-bearing joints where abrasion resistance is required(walkways, driveways, runways, etc.). Please refer to Chem-Calk®955-SL for this application.

n Chem-Calk 900 is not recommended for continuous immersion inwater or any other fluid. When fully cured, avoid exposure, evenincidental, to fuels, chlorinated, acid and alkaline solutions. Chem-Calk 900 is not recommended for exterior or interior sealingbelow the waterline; please refer to Bostik® 940 Fast Set formarine applications.

n Contact of Chem-Calk 900 with asphalts (i.e., back coating ofwindow flashing, etc.) and other filler compounds impregnatedwith oil, asphalt, tar, etc., may deteriorate the cohesive strengthof the substrate and ultimately compromise the seal.

n During the curing of Chem-Calk 900, do not expose to curingsilicone sealants, curing Chem-Calk® 2000 or Chem-Calk®2020, alcohol, acids or solvent-based materials.

n Compatibility to copper-based substrates (i.e., flashing) can varydue to, but not limited to, age and joint size. Please consultTechnical Service for details.

n Lower relative humidity and temperature will significantly extendthe curing time. Confined areas, deep joints and moisture barriersubstrates may also affect the full cure time and extend it bymany days.

n Until the sealant is fully cured, do not expose the sealant to anymechanical stress. Uncured sealant will not respond properly tocyclic expansion and contraction of the joint specified for thecured sealant only.

n Chem-Calk 900 is not recommended for glazing applications.Bond line strength can be affected by UV rays through the clearmaterial (glass, acrylic glass, polycarbonate, etc.)

n Chem-Calk 900 is not RTV silicone and therefore is suitable forpainting with latex based paints. Paint chemistries and flexibilitycharacteristics of the paint films over the sealant may affectwetting, adhesion and integrity of the paint layer; and it istherefore mandatory to pretest the paint or other coating overthe Chem-Calk 900 to ensure the successful compatibilitybetween the sealant and the paint/coating after a sufficientamount of time. See your paint manufacturer for specificationsand limitations and call our Technical Service for moreinformation. In general, oil-based paints are not recommendedbecause of their poor elastic properties and because of theirpotential interaction with the sealant chemistry, which maycreate non-curing conditions for the sealant. Do not paint overthe polyurethane sealant until it has fully cured.

n The surface of a Chem-Calk 900 seal when exposed to UV raysand sunlight will yellow and not retain its gloss. Thisphenomenon can occur within a few weeks after exposure. Thechange of color is limited to the surface layer of the seal andshould not compromise the sealing properties of the Chem-Calk900 if the dimensions of the joint are proper and the sealant isotherwise properly applied. In areas where color retention iscritical, please refer to Bostik® Chem-Calk® 2000 and 2020.Chem-Calk 900 may remain tacky for a few hours and attractdust and dirt from the jobsite which may affect the appearanceof the sealant. Check tack-free time to prevent dirt pickup.

INSTALLATION PROTOCOLJoint Design:In general, more joint movement can be accommodated in a thin beadof sealant than a thick bead. Chem-Calk 900 polyurethane sealantshould be no thicker than 1/2" (12.7mm) and no thinner than 1/4"(6.4mm). In joints between 1/2" and 1", the ratio of sealant width todepth should be approximately 2:1. Sealant depth in joints between1/4” and 1/2" should be 1/4" deep. Joints with dynamic movementshould not be designed in widths less than 1/4".Surface Preparation:See limitations about surface preparation. Surfaces must bestructurally clean, dry (no frost) and structurally sound, free ofcontaminants, including but not limited to dust, dirt, loose particles, tar,asphalt, rust, mill oil, etc. If substrate is painted or coated, scrape awayall loose and weakly bonded paint or coating. Any paint or coating thatcannot be removed must be tested to verify adhesion of the sealant orto determine the appropriate surface preparation if needed. (See ASPsection on next page for details.)To remove laitance and any other loose material, clean concrete,stone or other masonry materials with nonalcoholic-based solvent bywashing, grinding, sandblasting or wire brushing as necessary. Do notuse water to clean substrates. Dust must be thoroughly removed aftercleaning.

Alcohol is not compatible with polyurethanes and its use can causeirreparable damage to the sealant. If alcohol is used as a cleaningsolvent, all traces of alcohol must thoroughly be removed prior to theinstallation of the polyurethane sealant. Lastly, alcohol is notrecommended as a tooling medium.Backer Rods and Bond Breaker Tapes:Bond breakers, including but not limited to closed-cell polyethylenebacker rods, are used to control depth of the sealant bead, provide afirm tooling surface and avoid three-sided adhesion. Where the depthof joint prevents use of backer rods, a polyethylene strip or tape mustbe used as a bond breaker to prevent 3-sided adhesion. Do not primeor damage the surface of the bond breaker. Refer to instructions givenby rod and tape manufacturers for the correct backer rod and tapesize related to joint size.

Priming:In general, application of Chem-Calk 900 does not require priming thesubstrates. However, some substrates may require a Bostik primer. It isthe user’s responsibility to check adhesion of the cured sealant on typicaltest joints at the project site before and also during application asweather conditions may affect the adhesion results (See ASP section onnext page.). Refer to Bostik Primer product data sheet or call TechnicalService for proper selection and application of Bostik Primers.Tooling:Chem-Calk 900 comes ready-to-use. Cut spout or tip to desired beadsize. Apply moderate pressure to break seal inside the nozzle. Apply byusing a professional caulking gun. Use opened cartridges and sausagesthe same day they are opened. Apply Chem-Calk 900 polyurethanesealant in a continuous operation using positive pressure to the bottomof the joint to properly fill and seal the joint. When applying, avoid airentrapment and overlapping. Tool the sealant before the skin forms withadequate pressure to spread the sealant against the backup material atthe bottom and sides of the joint. A dry tool with a concave profile isrecommended for that operation. Do not use water or soapy water forthis operation. Avoid smearing and feathering of the sealant to allow fullperformance of the cured seam. Excess sealant should be dry-wiped orjoints should be properly taped.Cleaning:After dry-wiping uncured sealant from substrates and tools, remaininguncured sealant can be removed by using Xylene, Toluene or similararomatic solvents. Please refer to the MSDSs provided for these solventsbefore use. Bostik® Hand and Tool towels can also remove uncuredsealant. Cured sealant is usually very difficult to remove without alteringor damaging the surface to which the sealant has been misapplied.Cured sealant can be removed by abrasion or other mechanical means(scrapers, putty knives).Curing Time:Chem-Calk 900 is a moisture cure, polyurethane sealant. On wood,with ambient air at 50% relative humidity and at 73°F, polyurethanesealants will generally skin within four hours and cure 1/16 of an inchper day. Lower temperature and lower relative humidity willsignificantly increase the skin time and cure time of a polyurethanesealant.Painting and Coating:(Refer to bullet 15 under the Application Limitations section.)Maintenance:If the sealant becomes damaged, replace the damaged portion byremoving the old sealant completely, cleaning the surfaces andreapplying a fresh and appropriate amount of new sealant inaccordance with the directions and information contained in this datasheet.

MANDATORY ADHESION TO SUBSTRATES PRETEST— (ASP)A hand pull test must be run before the job starts and at regularintervals during the job. It must be run on the job site after the sealantis fully cured, usually within 7 to 21 days. (Adhesion may develop fullyafter at least 14 days.)The hand pull test procedure is asfollows:1. Make a knife cut horizontally from

one side of the joint to the other.2. Make two vertical cuts approximately

two inches long, at the sides of thejoint, meeting the horizontal cut atthe top of the two-inch cuts.

3. Grasp the two-inch piece of sealantfirmly between the fingers and pulldown at a 90° angle or more, and tryto pull the uncut sealant out of thejoint.

4. If adhesion is sufficient, the sealant should tear cohesively initself.

5. Sealant may be replaced by applying more sealant in the samemanner as it was originally applied. Care should be taken toensure that the new sealant is in contact with the original, andthat the original sealant surfaces are clean, so that a properbond between the new and old sealant will be obtained.

STORAGE • PACKAGING • SHELF LIFEShelf life of Chem-Calk 900 must be checked prior to using theproduct; do not use past its shelf life. Caulk past its shelf life may notperform or adhere as described by this data sheet. High temperatureand high relative humidity may reduce significantly the shelf life ofpolyurethane sealants. If you are unsure of the expiration date ofyour Bostik product, please call customer service at 1-800-7/BOSTIK(1-800-726-7845) to check if the product is still within its shelf life.

COLORSWhite Antique White Tan Med. BronzeBlack Stone Limestone Bronze

AVAILABILITYAvailable from authorized Bostik distributors. Go to www.bostik-us.comand check our distributor locator for the closest distributor in yourlocation or call customer service at 1-800-7/BOSTIK (1-800-726-7845).

HEALTH AND SAFETYPlease refer to the MSDS for First Aid Information. Most currentMSDS’s can be found on Bostik’s website at www.bostik-us.com orcall customer service at 1-800-7/BOSTIK (1-800-726-7845).

TECHNICAL SERVICETECH SERVICE phone number: 1-800-7/BOSTIK (1-800-726-7845).Field visits by Bostik personnel, Bostik manufacturer representativesor Bostik authorized distributor personnel are for the purpose ofmaking technical recommendations only and not for supervising orproviding quality control on the jobsite.

WARRANTY (LIMITED WARRANTY) — IMPORTANT NOTICEAll statements, technical information and recommendations set forthherein are based on tests which Bostik believes to be reliable.However, Bostik does not guarantee their accuracy or completeness.The buyer and/or user should conduct its own tests of this productbefore use to determine proper preparation technique and suitabilityfor proposed application. Any sales of this product shall be on termsand conditions set forth on Bostik’s order acknowledgment. Bostikwarrants that the product conforms with Bostik written specificationsand is free from defects at the time it leaves Bostik’s control. BOSTIKDISCLAIMS ALL OTHER WARRANTIES, EXPRESSED AND/OR IMPLIED,INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE. THE BUYER’S SOLE REMEDY FORNONCOMPLIANCE WITH THIS WARRANTY SHALL BE FOR THEREPLACEMENT OF THE PRODUCT OR REFUND OF THE BUYER’SPURCHASE PRICE. IN NO CASE WILL BOSTIK BE LIABLE FOR DIRECT,CONSEQUENTIAL ECONOMIC OR OTHER DAMAGES.

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DATE OF LAST REVISION: 11/01/10

MANUFACTURERBostik, Inc.211 Boston StreetMiddleton, MA 01949-2128 USACustomer or Technical Service: 1-800-7/BOSTIKTechnical Fax: (215) 957-0716www.bostik-us.com

PRODUCT DESCRIPTIONChem-Calk 900 sealant is a one-component, architecturalgrade, polyurethane sealant capable of dynamic jointmovement totaling 50% of original joint geometry (±25%).The sealant cures to a tough, flexible rubber when exposedto moisture present in the atmosphere.Chem-Calk 900 polyurethane sealant has a consistencylike toothpaste, its physical properties will remain relativelystable over time and in varying weather conditions. Itsphysical properties are relatively unchanged over a widetemperature range, -40°F to 150°F (-40°C to 66°C).Where textured appearance is needed, please useBostik® Chem-Calk® 916.

APPLICABLE STANDARDSn ASTM C920, TYPE S, GRADE NS, CLASS 25, USE

NT, A AND M. n US Federal Specification TT-S 00230C (COMB-

NBS) for one-component sealants as Type II, ClassA, Non-Sag.

n Canadian Specification CAN/CGSB 19.13-M87.n CARB and SCAQMD Compliant.n Meets VOC Requirements for OTC Regulation.

BASIC USESn Designed for sealing expansion and control joints

in pre-cast concrete panels and metal curtainwalls; perimeter sealing of door and windowframing and other building components.

n Sealant cures to form a durable, flexible bond withmost building materials in any combinationincluding stone, masonry, ceramic, marble, wood,steel, aluminum and many plastics.

FOOD STATUSChem-Calk 900 sealant is acceptable for use inconstruction and repairs that may result in incidentalcontact with food in USDA inspected meat and poultryplants. FDA 175.105.

Chem-Calk® 900ONE-COMPONENT, POLYURETHANE ELASTOMERIC. ARCHITECTURAL GRADE

TABLE 1: CHEM-CALK® 900TYPICAL UNCURED PROPERTIES*

Property Value Test Method/Note

Tool/Work Time 70 min. Bostik Test MethodSkin Time 6 hrs. TT-S-00230C/ASTM C 679Curing Time @ 77°F 3 - 7 days Varies w/ relative humidityFlow, Sag or Slump 0.1 inch TT-S-00230C/ASTM C 639Staining None TT-S-00230C/ASTM C 510

TABLE 2: CHEM-CALK® 900TYPICAL CURED PROPERTIES*

(After 14 days cure at 77˚F and 50% RH)

Property Value Test Method/Note

Hardness (Shore A) 38 ASTM D 2240Modulus @ 100% Elongation 70 psi ASTM D 412Tensile Strength @ Break 180 psi ASTM D 412Elongation @ Break 950% ASTM D 412Adhesion Peel >35 piw TT-S-00230C/ASTM C 794Joint Movement Capability +25% TT-S-00230C/ASTM C 719UV Resistance Pass ASTM C 793* Values given above are not intended to be used in specification preparation.

FEATURES & BENEFITSn Superior Adhesion to Most Helps Maintain a Weatherseal to Common Building Materials Seal Out the Elementsn Unprimed Adhesion / Easy Gunning One-Step installation / Installer Friendlyn CARB and SCAQMD Compliant Can be used anywhere within the USA

TABLE 3: CHEM-CALK®¨ 900ASTM C-794 ADHESION-IN-PEEL

TO COMMON CONSTRUCTION SURFACES1

Surface lbs. / Inch Failure Type – %

Mill Finished Aluminum2 10 Adhesive – 100Anodized Aluminum >35 Cohesive – 100Steel2 15 Adhesive – 100Galvanized Steel >35 Cohesive – 100Stainless Steel2 11 Adhesive – 100Fiberglass 31 Cohesive – 100ABS2 16 Adhesive – 100Rigid PVC2 10 Adhesive – 100Plywood3 >35 Cohesive – 100Concrete3 >32 Cohesive – 100Brick >35 Cohesive – 100Granite >35 Cohesive – 100Marble2 >10 Adhesive – 100Limestone3 >35 Cohesive – 1001 Values given above are not intended to be used in specification preparation.2 With primer, value is >30, Cohesive—100.3 Peel values are reduced when unprimed samples are water-reduced.

T E C H N I C A L D A T A S H E E T

C1