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GULF STANDARD GS 603/2000

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GS 561

ROAD MARKING PAINTS

TEST METHODS

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ROAD MARKING PAINTS

TEST METHODS

ICS: 87.040

Date of GSMO Board of Directors Approval : 1415(H)-06-13 (1994-11-16)

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ROAD MARKING PAINTS

TEST METHODS

1. SCOPE AND FIELD OF APPLICATION

This Gulf standard includes methods of test for road marking paints used on

asphalt and concrete surfaces.

2. COMPLEMENTARY REFERENCES

2.1. GS 452/1994 Road Marking Paints.

2.2 GS...../...... Solid Glass Beads Additive to Thermoplastic Which Used in

Road Marking.

2.3 GS 498/1994 Methods of Test for Paints and Varnishes - Preparation of Test

Panels Before Coating.

2.4 GS...../...... Methods of Test for Paints and Varnishes - Examination and

Preparation of Test Samples.

2.5 GS...../...... Methods of Test for Emulsion Paints and Varnishes.

2.6 GS...../...... Methods of Test for Paints and Varnishes - Effect of

Weathering on Paints.

2.7 GS...../...... Methods of Test for Paints and Varnishes - Resistance of

Paint Coatings to Washing and Scrubbing.

2.8 GS...../...... Methods of Test for Paints and Varnishes - Scratching Test.

3. EXAMINATION AND PREPARATION OF TEST SAMPLES

Examine and prepare test samples according to the Gulf standard mentioned in

(2.4).

4. PREPARATION OF TEST PANELS BEFORE COATING AND PAINT

OPERATION

4.1 Test panels

Prepare test panels before coating according to the Gulf standard mentioned in

(2.3),

4.2 Paint operation

The test panel shall be coated with 200 m wet thickness paint coat, using paint

knife or any suitable device. Let the paint to dry for a period of 7 days far from

direct sunlight, dust or foreign matter, at a temperature of 25 2o

C and60 5% relative humidity unless otherwise provided in the standard.

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4.3 Test conditions

Control the test under the following conditions unless otherwise provided:

Temperature (25 2o

C).

Relative humidity 60 5%.

5. APPROVED SAMPLE

For laboratory test purposes, samples shall be taken from the produced or

imported batch, the manufacturer's store or at the working area in the presence

of representatives of the supervising body, the contractor, and the manufacturer.

Samples shall be packed in clean, intact and tightly sealed containers that do not

react with the paint components. Such containers shall not be less than one litre

in size and shall carry the batch number.

6. TEST AND INSPECTION

6.1 Retention of solid glass beads

6.1.1 Principle

Glass beads shall be allowed to fall onto the paint layer before it is dry, and the

mass of beads retained shall be determined after 1 h and after 7 days.

6.1.2 Apparatus and materials

Solid glass beads, according to the Gulf standard mentioned in (2.2).

Dispenser, comprising two plates, one fixed and one movable, and two

screens for beads distribution. The plates are 3 mm in thickness, and

perforated with similar holes of 4 mm diameter (see Fig. 1).

Container, of base 70 mm x 150 mm x 40 mm.

Glass test panel, prepared as in item (4).

Suitable scrubbing brush.

Scrubbing apparatus (see fig. 2).

6.1.3 Procedure

Fix the perforated movable plate in such a way as to be under the fixed

plate with its perforations not directly under the fixed plate. Scatter a

suitable quantity (ca 4 gm) of solid glass beads (using a brush) enough to

fill the space between the two plates. Work out the dispenser by sliding

the movable plate till the holes meet together, then the sieves will

distribute the beads in a regular way.

Fix the container in the dispenser centre, put the dispenser to work again

as stated above, weigh the container to nearest mg (m1), return the beads

to the dispenser using the brush to ensure that all beads have returned tothe dispenser.

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Prepare the test plate and coat with the paint to be tested. Put the test

plate in the dispenser centre, adjust the perforated movable plate to allow

the solid glass beads, to fall freely on the coated plate, note that this step

does not consume more than 20 seconds, let stand for about one hour.

Remove the dispenser and, using the scrubbing brush, lightly brush the

paint panel. Collect any non-adherent glass beads in paint coat and weigh

the beads to the nearest milligram (m2).

Keep the painted test panel, with the adhering glass beads, at 25 2oC

and 60 5% relative humidity for 7 days.

Weigh the test panel to the nearest milligram (m3).

Fix the test panel uppermost on the scrubbing apparatus (see Fig. 2) so as

to be under the scrubbing brush. Allow the scrubbing brush to come in

toutch with the paint coating. Place a 500 gweight on the scrubbingbrush, and start the scrubbing apparatus for 100 revolutions.

Weigh the test panel to the nearest milligram (m4) and measure the total

and the brushed areas of the paint test panel to the nearest square

millimeter.

Calculate percentage of the glass beads removed by the equation:

100 x (m3 - m4) x At

Percentage of beads removed =

(m1 - m2) x As

Where:

AS is the area scrubbed by the brush.

At is the area of the beaded paint panel.

m1 is the mass (in g) of the glass beads discharged by the dispenser over the

test area.

m2 is the mass (in g) of the non-adherent glass beads.

m3 is the mass (in g) of the glass test panel before brushing.

m4 is the mass (in g) of the glass test panel after brushing.

6.2 Determination of luminance factor

Determination of luminance factor shall be according to the method described in

the Gulf standard mentioned in (2.2), provided that the test panel and the test

sample shall be prepared as in item (4).

6.3 Abrasion resistance

6.3.1 PrincipleAllow the grit to impinge on the paint coating then examine it for damage.

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Standard sand grit according to the American standard.

Funnel, with an orifice of 203.2 mm diameter and internal diameter of 91mm for the open end to which is attached a straight tube of the same

internal diameter (see Fig. 3). The tube is fitted with a shutter of an

aperture diameter 91 mm immediately below the funnel and 0.9 mm away

from the open end of the tube.

Stand, for holding the funnel and the attached tube in a vertical position.

Stand, suitable for holding the test panel at an angle of 45o to the

horizontal.

6.3.3 Procedure

Prepare the glass test panel as described in item (4).

Secure the test panel at an angle of 45o to the horizontal.

Place the funnel in the stand in such a manner that the bottom of the tube

is 25 mm from the paint film and not less than 25 mm from the edge of the

test panel.

Close the shutter and place 2 litres from the grit in the funnel.

Open the shutter fully and rapidly to allow the grit to fall down the tube in

a continuous stream and impinge the paint film, repeat this procedure.

Remove the panel after two passes of grit and examine by the naked eyeto determine whether the test panel can be seen through the paint coating.

6.4 Weathering resistance

6.4.1 Preparation of test panels

Test panels shall be used and prepared according to the Gulf standard

mentioned in (2.5), and the test shall be carried out as described in the Gulf

standard mentioned in (2.6).

6.5 Bleeding resistance

6.5.1 Principle

The paint is applied to the bitumen surface and the paint film is examined for

discolouration after 72 h.


Bitumen according to approved standards, in a quantity sufficient to fill a

metal tray to a depth of at least 6 mm.

Metal tray, of minimum size 150 x 200 mm x 6 mm. The walls of the tray

should be uniform.

Hot plate, capable of maintaining a temperature of 571 10oC.

Straightedge knife of steel with a minimum length of 200 mm.

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6.5.3 Procedure

Heat the bitumen in the metal tray on the hot plate, to 175 10oC. When

the bitumen is molten, spread it with the straightedge knife to give a

smooth surface, level with the walls of the tray.

Allow the bitumen to cool and condition at a temperature of 52 2oC for

42 h.

Secure a strip of transparent tape of 25 mm width across the bitumen

surface, approximately 25 mm from and parallel to the 200 mm side of the

metal tray.

Place two steel shims of a thickness 350 so as to make a right angle

with the tape edge with 40 mm distance between them.

With the aid of a doctor blade, apply a film of the paint across the tapeand over the bitumen surface with one pass of the blade. Allow the Paint

film to dry in a horizontal position at 25 2oC and 60 5% relative

humidity for 72 h.

Examine the paint film over bitumen and on the transparent tape.

Record the difference in colour, if any.

6.6 Resistance to petroleum materials

6.6.1 Principle

Place drops from petroleum materials (kerosene) on the paint film for 24 h, and

examine to detect any change in characteristics.

6.6.2 Materials

Kerosene, absorbent paper.

6.6.3 Procedure

Prepare two glass test panels and coate them with the paint to be

examined as described in item (4).

Allow to dry for 72 h. Place drops from kerosene, about 0.5 mm each, on

one panel and leave for 24 h.

Clean kerosene drops on the panel with the absorbent paper.

Examine the film by the naked eye for presence of blistering, breaking,

tenderness or deterioration, using the non-immersed film as a reference.

6.7 Resistance to washing with scrubbing using tap water

6.7.1 Preparation of test panels

Test panels shall be prepared and used as described in the Gulf standard

mentioned in (2.7).

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6.8 Resistance to salt solution

6.8.1 Principle

The paint to be tested shall be applied to a glass test panel which is subsequentlyimmersed in a saline solution for 24 h. The resistance of the film to scratch shall

be immediately assessed and after a recovery period, changes in other properties

shall be determined.

6.8.2 Materials

Sodium chloride solution 10% (w/w).

Absorbent paper.

6.8.3 Procedure

Prepare two glass test panels and coat with the paint to be tested as in

item 4 and allow them to dry for 72 h.

One of the test panels is immersed for 24 h, in a suitable container

containing 10% sodium chloride solution. The container shall be covered

during this period.

Remove the panel from the solution and dry with the absorbent paper.

Allow a period of 5 min then carry out the scratch test as described in the

Gulf standard mentioned in 2.8, using a load of 1 kg. Examine the paint

films for penetration to the substrate and report the results.

Allow the test panel to stand for another period of 3 h, then re-examine

the paint film by the naked eye for signs of change in colour or blistering,

using the nonimmersed test panel for comparison and report occurance of

any deterioration. Also examine the paint film for any signs of tenderness

or crispiness, using the nonimmersed test panel for comparison, and

report occurance of any deterioration.

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