HUAMEI FUMED SILICA PROFILE(1)

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2 Henan Huamei Chemical Co.,Ltd www.chinafumedsilica.com

ContentsIntroduction to HMFSIL 3Applications & Performance Benefits 4Product Range Overview 6Application & Selection Guide 8Packaging & Storage 10HMFTechnical Centre 11

Pyrogenic FumedSilica by

Henan Huamei Chemical Co.,Ltd

Henan Huamei Cinda Industrial Co.,Ltd



HMFSIL–Pyrogenic Fumed Silica by ICV

HMFSIL is an amorphous, anhydrous colloidalsilicon dioxide (pyrogenic fumed silica) that findsapplication in various industrial systems becauseof its small particle size, large BET surface area,spherical morphology, high surface activity andpurity.

HMFSIL has various performance benefits and isused as an anti-caking (free-flow) agent inpowder systems, thickening and thixotropic agentin liquid systems and as a reinforcing filler. Itfinds use in industries as diverse as food,pharmaceuticals, cosmetics, paints & coatings,inks, adhesives, unsaturated polyester resins andelastomers.

Chemistry of Fumed Silica

Fumed Silica (or Pyrogenic Silica) is a white, fluffy powderof amorphous structure. According to surface chemistry,fumed silica is classified as hydrophilic (untreated) andhydrophobic (treated) fumed silica.

Hydrophilic fumed silica is generally manufactured by theflame hydrolysis of volatile chlorosilanes (silicontetrachloride ) in an oxyhydrogen flame.

Hydrophobic fumed silica is produced by reactinghydrophilic fumed silica with hexamethyldisilazane. Thisgives the fumed silica hydrophobicity necessary forvarious applications and functionalities where waterrepellency is important.

Burner Molecules Proto-particles

Primaryparticles

Aggregates Agglomerates

SiO 2 SiO 2

SiO 2 SiO 2

Reaction at > 1500ºCSiCl4+ 2H2 + O2 SiO2 + 4HCI

Preparation of fumed silica in the flame


PERFORMANCEANDFUNCTIONALBENEFITSTypical Application Areas

HTV / RTV – Silicone Rubber SiliconesealantsAdhesivesUnsaturated Polyester Resins PVCCompoundsPaints & Coatings Printing inks &pigmentsCosmetics and personal carePharmaceuticalsFood (Spices and vegetable powders)Greases

Rheology Control & Thixotropy

HMFSIL is used in various applicationsto provide viscosity control andthixotropic behavior. HMFSIL performsbest in non- polar liquids in which thesilica aggregates link together intochains through hydrogen bonding. Theresulting 3-dimensional structure can bebroken down by subjecting the systemto mechanical stress through stirring orshaking. In a state of rest, HMFSILparticles link-up again, restoringviscosity.

In polar and semi-polar liquids(hydrogen bonded system) hydrophilicfumed silica has a less pronouncedthickening effect.

Reinforcement

HMFSIL is used to providereinforcement and improve mechanicalproperties like tensile strength,elongation at break and tear resistancein elastomers, sealants, adhesives, HTV& RTV silicone rubber, mouldingcompounds and cable insulations.

Free flow and anti caking properties

HMFSIL is used in hydroscopic powders,resins and adhesives that experiencecaking and lumping. The nano-sizedHMFSIL particles form a layer of silicaaround the powder particles, reducingfrictional forces and developing a ballbearing effect. HMFSIL is used toimprove fre e f lo w in fo o d p o wd e r s ,f i re extinguisher powders, PVC mater-batches, resins and other powders.

Anti-settling, dispersion & grinding andsag resistance

HMFSIL p re ve n t s o r d e la ys th esedimentation of solids in liquid systemssuch as pigmented coatings or resinscontaining fillers where sedimentationbecomes unavoidable. HMFSIL particlesloosen the solid s tructure, makingremixing easy.

In unsaturated polyester resins and gelcoats, HMFSIL prevents the draining orsagging of the resin when applied tovertical surfaces.

PERFORMANCEANDFUNCTIONALBENEFITSHMFSIL finds special application inchemical mechanical polishing (CMP)due to its scratch and abrasionresistance when dry grinding ordispersing solids in liquids and sizereduction application.HMFSILencapsulates fragment particles andhence prevents theirre - agglo meration .

Adsorbency & Carrier Application

HMFSILl can adsorb gaseous, liquidand even solid materials in dissolvedform. This is due to its high specificsurface area. By carrying significantamounts of liquid, it converts liquids andpastes into free flowing powders,facilitating dosing and handling.

Electric & Thermal Insulation

HMFSIL has very low solid state thermalconductivity due to the small particlesize and spaces between the particles –its high purity also makes it an excellentelectrical insulator. It is also s table athigh temperatures.

All these properties make HMFSIL avery useful additive in application asdiverse as elastomers.

Electrostatic Charge Effect

HMFSIL particles acquire a negativecharge due to the slightly acidic silanolgroups on the surface. This findsapplication in printer and copier tonerswhere the powder must be negativelycharged to adhere to the positive roller.In other powders, HMFSIL can reducethe tendency to acquire a negativecharge and hence avoid undesirableproperties in plastic powders.


PRODUCT RANGEOVERVIEWHYDROPHILIC FUMED SILICA HYDROPHOBIC FUMED SILICA

TypicaI Properties & Test Method/Grade UnitHMFSIL100

HMFSIL150

HMFSIL200

HMFSIL 300 HMFSIL380

HMFSILB120

HMFSILB170

HMFSILB200

BET Surface Area DIN EN ISO 9277ƒDIN66132

m2ƒg 100±25 150±25 200±25 300±25 380±25 120±20 170±25 200±25

Average primary particle size nm. 20 14 12 07 07 16 12 07

pH value in 4% dispersion DIN EN ISO 787ƒ9 (inwater: methanol = 1:1)

− 3.7 − 4.7 6.0 − 7.5 6.0 − 7.5 5.5 − 7.5

Loss on drying, ex−works (2 hours @ 105 ºC) DINEN ISO 787ƒ2 Wt% < 1.0 < 1.5 < 1.5 < 1.5 < 2.0 < 1.0 < 1.0 < 0.5

Loss on ignition 2 hours @ 1000 ºC based onmaterial dried for 2 hours 105 ºC DIN EN ISO

3262−19Wt% < 1.0 < 1.0 < 1.0 < 2.0 < 2.5 < 1.0 < 1.0 < 1.0

Sieve residue (45 µm) DIN EN ISO 787−18 % < 0.05 _ _ _

SiO2 content based on material heated at 1000 ºCfor two hours DIN 51757 Wt% > 99.8 > 99.8

Tamped density based on material dried for 2hours @ 105 ºC DIN EN ISO 787ƒ11 g ƒ L 25 − 60 40 − 60

Carbon content based on material dried for 2hours @ 105 ºC

Wt% < 0.2 1.5−2.5 1.5−2.5 >1.8

AI2O3 content Wt% < 0.05 < 0.05

TIO2 content Wt% < 0.03 < 0.03

Fe2O3 content Wt% < 0.003 < 0.003

Surface treatment (Hydrophobic character)Not Treated Hexamethyldisilazane


55 m2ƒg 380 m2ƒg

Undensed Densed

Quality Designations

All product numbers in the HMFSIL rangeare available in the following three grades:

Industrial: This is a multi-purpose gradethat finds applications in technicalapplications like sealants & adhesives,composites & unsaturated polyester resins,PVC and various other industrial

Optimizing performance parameters of dispersionsas related to:Surface Area

Easy Wetting Difficult

Easy Dispersion Difficult

Low Thixotropy High

Low Reinforcement High

applications where quality is not the primeparameter and the performance benefitsare to be desired.

Low Transparency

BuIk Density

High

Standard: The standard grade of HMFSILfinds applications in more demandingindustries like cosmetics & personal careproducts, food products andpharmaceutical applications.

Slow Wetting Fast

Easy Dispersion Difficult

High Thixotropy Low

Pharmaceutical: The highest grade is Low Surface Area 380 m2ƒg

manufactured in strict accordance withstringent regulations and tested to complywith most pharmacopeia worldwide. Thepharmaceutical grade has identicalapplication properties as the standardgrade but undergoes many additional teststo conform to pharmacopeial requirements.

Low Hydrophobicity High

High Moisture pick−up Low

High Rubber plasticity Low

High Silicone rubber crepe hardening Low

High Reinforcement Low


APPLICATION AND SELECTION GUIDEIndustry Segment Primary Performance Benefits Application Areas Suggested Grade(s)

RecommendedAddition (mlm%)

Silicone Sealants,Silicone Rubbers& Elastomers

Reinforcement, thixotropy, sagresistance ,rheoIogy, controI , dispersabiIity and free fIow improvement

RTV Silicone Sealants 100, 150, B120, B170 3.0 - 30.0RTV Silicone Rubber 100, 150, B120, B170 3.0 - 30.0HTV Silicone Rubber 100, 150, B170 15.0 - 50.0

Polyurethanes & Polysulfides 150, 200, B170 3.0 - 25.0Acrylates 150, B170 0.5 - 1.5

Natural & Synthetic Rubbers 200, B170 5.0 - 40.0Silicone Elastomers 100, 150, 200, 300 3.0 - 35.0

Paints & Coatings Thickening, thixotropy, free f Iowimprovement and anti-settIing

Polyester Paints 200, 300, 380 0.5 - 2.5Polyester Gel Coats 200, 300, 380 2.0 - 3.0

Epoxy Resins & Polyurethane Coatings B170, B200 1.0 - 4.5Alkyd Resin Coats 200, 300, 380, B120 0.5 - 5.0Acrylic Resin Coats 200, 300, 380 0.3 - 2.5Powder Coatings 150, 200, B170 0.5 - 5.0Zinc Rich Paints B120, B170, B200 0.5 - 2.0

UnsaturatedPolyester Resins

Thickening, thixotropy, rheo I ogycontroI and anti-sedimentation

Laminating Resins 200 0.8 - 1.5Gel Coats 200, 300 2.0 - 3.0Putties 200 0.5 - 1.0

Casting Resins & Grouting Mixtures 200 0.5 - 2.0Vinyl Ester Resins (Polar) B120 0.5 - 3.0

PVC & PVCCompounds

Thickening , thixotropy, anti -sedimentation, anti- sticking, free fIow

improvement and anti - bIocking

Plastisols & Organosols 200, 300, 380 0.3 - 2.5Plasticized PVC Compounds 200, 300 0.1 - 1.0

Cable Compounds 300, 380 1.0 - 3.0Membranes, films and sheets 200, 300, B170 0.1 - 1.0

Printing Inks &Pigments

Thickening , thixotropy, anti -settIing , improved briIIiance &contrast, gIoss and water

absorption

Relief (letterpress & flexographic) Printing 200 0.5 - 2.5Intaglio (Gravure) Printing 200 0.5 - 2.0

Planographics (offset & lithographic) B120, B170 0.5 - 2.0Porous (screen) Printing 200, 380 1.0 - 10.0


Industry Segment Primary Performance Benefits Application Areas SuggestedGrade(s)

RecommendedAddition (mlm%)

Adhesives &Insulating Gels

T h i c k e n i n g ,t h i x o t r o p y,a nt i - sett I ing, sag resistance, extrusiorate, rheoIogy controI and adhesio

Polychloropropene based 200 0.8 - 5.0n Epoxy Resins - Polyurethane & Cyanoacrylate 200, B120, B170 1.0 - 2.0

n basedimprovement Insulating Gels/Glues for Cable & Splice Fillings 200, B120, B170 5.0 - 10.0

Pharmaceuticals

Free flow improvement, processingaid, reducing tablet hardness, weight& content uniformity and reduced

powder segregation. For creams andlotions, it provides thickening, anti-

settling and heat stability.

Pharmaceutical Tableting 200Powders 200

Gels, Creams, Lotions and Ointments 200

Cosmetics &Personal Care

Thickening, thixotropy, free flow andanti-settling

Toothpaste 150, 200 1.5 - 5.0Ointments & Creams 150, 200 2.0 - 10.0

Powders 200, B170 0.1 - 2.0Aerosols 200 0.1 - 3.0

Suspensions 150, 200 0.2 - 3.0Rheology & viscosity control,

temperature stability, adsorbency andhydrophobicity improver.

Anti-perspirant Gels/Sticks 150, 200, B120 0.5 - 5.0Lipsticks & Nail Polishes 150, 200, B120 1.5 - 5.0

Fragrances 200 1.5 - 5.0Hair Care Products 150, 200 1.5 - 5.0

Food & Nutrition Free flow improvement, anti-cakingagent and improves storage life

Powdered Spices 200Powdered Food 200 0.5 - 3.0

Vegetable Powders 200

MiscellaneousIndustrial

Applications

Thickening, thixotropy,free flowenhancement, adhesion

improvement

Fire Extinguishing Powder B120Cable Gel 300, 380

Transparent Shoe SoleAccumulators (Battery Acids) 200 2.0 - 6.0

Note: these figures are intended as a guide and should not be used in preparing specifications.


Packaging & Delivery

HMFSIL is packed in multi layer, kraft paperbags containing lO kg each. The bags aredelivered on pallets which are shrinkwrapped with a polyethylene film. HMFSILis delivered by road or sea as boxcontainers with the following configurations:20’ GP – 1.8 MT, 1-pallets, 180 kg / pallet40’ GP – 3.6 MT, 20 pallets, 180 kg / pallet40’ HQ – 4.0 MT, 20 pallets,200kg / pallet

Storage and stability

HMFSIL remains chemically stable formany years under appropriate storageconditions. However, contact withhydrofluoric acid or any highly alkalinesubstance must be prevented becausethese types of material react with silicondioxide.

HMFSIL also does not degrade with time.Hydrophilic grades of HMFSIL will adsorbmoisture and other vapors. However anyadsorption of water is reversible. Theremay be a slight increase in moisturecontent over time depending on ambienttemperature and re la t ive humidityconditions. Adsorbed moisture can beremoved by vacuum drying or heating thefumed silica.

During longer storage times, slightcompaction may take place, particularly inlower layers of a pallet. The tamped densitymay increase slightly, also leading to astructural change.It is therefore recommended that :HMFSIL must be stored in a clean, dry areaaway from humidity and volatile substancesand at ambient temperatures.HMFSIL should be used within 2 years ofthe production date as bags may startdeteriorating beyond this time period andchanges in properties may be expected.

Global availability

Huamei has a rapidly expanding globalpresence and the HMFSIL range is currentlyavailable across all continents.Huamei optimizes logistics and we try ourbest to ship from locations closest to you toreduce lead times and shipping costs.

we maintains its presence through a networkof subsidiary offices and reliable channelpartners in a number of countries. Pleasevisit our website to obtain information aboutan office or distributor in your area.


HMF INNOVATIONCENTRE

To fulfill the requirements of the diverse industrialsectors where HMFSIL finds applications, it mustconform to the requirements of the various industrialsectors. Hence, ICV sells a wide range of fumed silicasto fulfill the requirement of each sector. The globaltechnical teams work in close coordination andcollaboration with our customers worldwide to findcustomer requirements and develop products accordingto customers’ exacting requirements. Each productionsite acts as an innovation centre geared to meet thechallenges of regional demands and specific customerrequirements. For the most demanding application, wecan customize specifications as per your requirementsand develop a grade tailored to your needs.

To find out more

General Inquiry : [email protected] Assistance: [email protected]


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HUAMEI FUMED SILICA PROFILE(1)