BUREAU OF INDIAN STANDARDS. Draft Indian Standard EPOXY NON-SKID PAINT(BASE AND HARDNER)

Transcription

1 FOR BIS USE ONLY DOC:CHD 20 (1933)C December 2012 BUREAU OF INDIAN STANDARDS Draft Indian Standard EPOXY NON-SKID PAINT(BASE AND HARDNER) (Not to be reproduced without the permission of BIS or used as STANDARD) Last date for receipt of comments is FOREWARD (Formal clauses will be added later on) 1 SCOPE. 1.1 This specification relates to epoxy non-skid paint used for providing skid resistance coating on decks of ships and other platforms where non-skidding properties are required. It also possesses adequate resistance to thermal shocks generated from different sources. 1.2 The mixed paint shall be suitable for application by brushing to provide a uniform coating with rough texture. The paint will be applied as two/three coat system to steel deck or platform which has been suitably prepared by abrasive blasting and coated with an approved epoxy primer. 2. REFERENCES 2.1 The standards listed in Annex A contain provisions which through reference in this text, constitute provisions of and necessary adjuncts to this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated in Annex A. 3 TERMINOLOGY 3.1 For the purpose of this standard, the definitions given in IS:1303 shall apply. 4 REQUIREMENTS 4.1 Composition The epoxy non-skid paint comprises of two components, base and hardner, to be mixed in ration 19:1 by volume. The base component consists of blends of epoxy resins suitably pigmented and mixed with abrasive materials. The catalyst shall be based on polyamide resins In mixed paint, the total non-volatile vehicle content shall not be less than 12 percent and pigment including abrasive materials shall be percent by weight when examined as per method prescribed in IS 101 (Part 8/Sec 2). 4.2 Mass Mass of the material shall be Checked by dividing the weight of the paint in the drum by the volume of the paint in the drum. 1

2 4.2.2 Draw about 500 ml sample from the drum using suitable sampling equipment. Mass of the material shall also be checked by the method prescribed in IS 101(Part 1/Sec 7). The mass/lit should be within 10% of the mass/lit obtained by the method as in above. 4.3 Keeping Quality Base and Hardner when stored in original containers under normal conditions and examined by method described in IS 101 (Part 6 / Sec 2) shall retain the properties described in this specification for a minimum period of twelve months from the date of manufacture. The mixed paint prepared using stored components shall also fulfill all the requirements of this specification. 4.4 Epoxy non-skid paint shall also comply with the requirements given in Table 1. Sl. No Table 1 Requirements of Epoxy Non-Skid paint (Clause 4.3) Characteristics Requirement Method of Test As Per IS 101 ANNEX 1. Preliminary examination The base and curing agent each shall be in such a condition that stirring Part 1/ Sec 2 easily produces a homogenous material and on mixing gives a paint suitable for application by brushing. 2. Application properties Suitable for application by brush Part 1/ Sec 4 3. Drying time (max.) Part 3/ Sec 1 (a) Surface dry (b) Hard dry 2 hrs 6 hrs 4. Colour Dark admiralty grey to shade no. 632, Black, White of IS 5 5. Finish Paint on drying shall produce hard film of satisfactory uniform finish and texture 6. Flexibility and adhesion (Bend test) To pass the test Part 4/ Sec 2 Part 3/ Sec 4 7. Impact test To pass the test C 8. Flash point, min 25 0 C Part 1/ Sec 6 9. Pot life, hrs. min 8 D 10. Total abrasive content (% weight of the abrasive materials) 11. Resistance to Sea water (4 weeks) To pass the test 12. Resistance to Kerosene No softening or deterioration of paint film 13. Resistance to abrasion, loss in wt. For 600 Not more than 60 B E F G H 2

3 strokes, mg. 14. Resistance to thermal shock 15. Resistance to accelerated weathering 16. Non-skid property (a) Co-efficient of static friction, Minimum (b)co-efficient of sliding friction, Minimum Coating shall not show any cracking or loss of adhesion The paint film shall not show appreciable change in colour, cracking or loss of adhesion Dry Wet Oily J K L 5 PACKING AND MARKING 5.1 Packing The materials shall be packed as mentioned in succeeding clauses The base should be packed in mild steel cylindrical drums of 10 litre capacity conforming to grade B2 of IS:2552 for steel drums (Galvanised and ungalvanised). Drums shall be fitted with 100 mm inner plug and capseal closures. Drums shall be provided with a strap handle in the centre of the top not projecting beyond the top rim of the drum. Base should be packed upto a certain level keeping necessary allowance to mix specified proportion of hardner in the base drum to make 10 litres of epoxy non-skid paint The hardner for the paint shall be packed in mild steel cylindrical drums of suitable capacity conforming to grade B2 of IS:2552 fitted with 100 mm inner plug and capseal closure and shall be fitted with strap handle. 5.2 Marking Each drum/tin shall be legibly marked by paint (and not by loose stickers which are likely to come off) as under: (i) (ii) (iii) (iv) (v) vi) vii) Nomenclature of the stores indicating base and hardner. Manufacturer name and his recognised trade mark, if any. Mixing ratio of base and hardner by volume. Quantity of individual component (base or hardner) and finished paint after mixing in litres. Net and gross weight of drums/tins Batch number or Lot number in code or otherwise; Month and year of manufacture; BIS Certification Marking The container may also be marked with the Standard Mark The use of the Standard Mark is governed by the provisions of Bureau of Indian Standards & Act, 1986 and the Rules and Regulations made there under. The details of conditions under which the licence for the use of the Standard Mark may be granted to manufacturers or producers maybe obtained from the Bureau of Indian Standards. 3

4 6 SAMPLING 6.1 The epoxy non-skid paint is filled with pigments and abrasives and requires precautions during sampling. The procedure for sampling is as follows: 6.2 Examine the conditions of all the drums containing base and select the drum at random for sampling. The drum must be rolled forward and backward to ensure mixing of all ingredients of paint. 6.3 Samples are to be drawn separately from each batch offered as per procedure given for base and as per IS: 101 (Part 1/Sec 1) for catalyst. 7 TEST METHODS 7.1 Tests shall be conducted as per test methods stipulated in IS 101 and appendices mentioned in Table Quality of Reagents Unless specified otherwise, pure chemicals and distilled water (conforming to IS: ) shall be employed in tests. NOTE - Pure chemicals shall mean chemical that do not contain impurities which affect the results of analysis. A N N E X (Clause 2) A IS No. IS: IS 101 (Part 1/ Sec 1) : 1986 Sec 2) : 1987 Sec 4) : 1987 Sec 6) : 1987 Sec 7) : 1987 (Part 3/ Sec 1) : 1986 Sec 2) : 1989 Sec 4) : 1987 (Part 5/ Sec 2) : 1988 Sec 3) : 1988 (Part 6/ Sec 2) : 1989 (Part 8 Sec 2) :1990 IS 170:2004 IS: IS 1070 : 1992 LIST OF REFERRED INDIAN STANDARDS Title Colours for Ready mixed paint and enamels. Methods of sampling and test for paints, varnishes and related products: Part 1 Test on liquid paints (general and physical), Sec 1 Sampling (third revision) Sec 2 Preliminary examination and preparation of samples for testing (3rd revision). Sec 4 Brushing test (third revision) Sec 6 Flash point (third revision) Sec 7 (third revision) Part 3 Test on paint film formation, Sec 1 Drying time (third revision) Sec 2 Film Thickness (third revision) Sec 4 Finish (third revision) Part 5 Mechanical tests on paint films Sec 2 Flexibility and adhesion tests (third revision) Sec 3 Impact resistance (falling weight) (third revision) Part 6 Durability test on paint films Sec 1 Keeping properties (third revision) Part 8 Tests for pigments and other solid Sec 2 Pigments and Non Volatile matter (third revision) Acetone - Specification(fourth revision) Specification for cold rolled low carbon steel sheets And strips (third revision) Reagent grade Water (third revision) 4

5 IS 1303 : 1983 IS: IS: IS: BS: IS: Glossary of terms relating to paint (second revision) Methods for Dry Sieving. Steel drums (galvanised and ungalvanised) (second revision) Chilled iron shots and grits for use in foundries Chloroprene rubber compounds Specification for Methyl iso-butyl Ketone (first revision) B-0 GENERAL A N N E X B (Table 1, Sl No 6) FLEXIBILITY AND ADHESION B-0.1 This method prescribes determination of flexibility and adhesion of the paint system by Bend Test method. B-0.2 This is an empirical test for assessing the resistance of a coating of paint to cracking and/ or detachment from a metal substrate when subjected to bending round a cylindrical mandrel. B-1 APPARATUS B-1.1 As prescribed in 2.2.1, and of IS 101(part 5/Sec 2). Ensure that the diameter of the cylindrical mandrel shall be of 25 mm. B-2 TEST PANELS B-2.1 Material and dimension - The test panel shall be of rectangular tinned steel plate of size approximately 100 mm x 50 mm. The other details shall be as precribed in 3.1 of IS 101(Part 1/Sec 3). This plate then to be prepard as burnished tinplate panels by the method as prescribed in 3.3, & of IS 101(Part1/ Sec 3). B-2.2 Apply two coats of epoxy non-skid paint on the panel by brushing. A coating interval of 24 hrs, should be maintained between each coat. Ensure the direction of laying off marks shall be parallel to the longer side of the panel. The panels shall be dried for 7 days under standard atmospheric conditions and test shall be carried out as soon as possible after that. B-3 PROCEDURE B-3.1 The test shall be carried out at 27 ± 2 C and 65 ± 5 percent relative humidity, unless otherwise specified. During the time of testing, warming the test panel by undue handling shall be avoided. B-3.2 The test shall be carried out on two separate test panels separately. Fully open the apparatus, fitted with the 25 mm diameter mandrel, and insert the panel so that it may subsequently be bent with the coated side outwards. Close the apparatus evenly without jerking, over a period of 1 to 2 s, thus bending the panel over the mandrel through 180. Note A piece of thin paper may be inserted over the coated surface between the panel holder and the bending piece to prevent the coating being scratched during the bending operation. B-4 EXAMINATION OF THE TEST PANEL B-4.1 Examine the test panel coating immediately after bending without removing the panel from the apparatus. Use normal corrected vision or, by agreement, a lens of 10 magnification, and examine the coating for cracking and/or detachment from the panel, ignoring the surface of 5

6 the coating less than 10 mm from the edge of the panel. The material shall be deemed as pass when the paint film shall not show signs of cracking or loss of adhesion. Note 1 If a lens is used, it is essential to mention this fact in the test report and to avoid misleading comparisons with results obtained using normal vision only. Note 2 If the results between the two test panels differ, additional test shall be made. C-0 SCOPE A N N E X C (Table 1, Sl No 7) DETERMINATION OF IMPACT RESISTANCE C-0.1 This method prescribes determination of resistance of impact on paint films, using a free falling ball. C-1 APPARATUS C-1.1 As prescribed in 3.1 of IS 101(part 5/Sec 3). C-2 TEST PANELS C-2.1 Material and dimension - The test panel shall be of rectangular tinned steel plate of size approximately 200 mm x 200 mm. The other details shall be as precribed in 3.1 of IS 101(Part 1/Sec 3). This plate then to be prepard as burnished tinplate panels by the method as prescribed in 3.3, & of IS 101(Part1/Sec 3). C-2.2 Apply two coats of epoxy non-skid paint on the panel by brushing. A coating interval of 24 hrs, should be maintained between each coat. The panels shall be dried for 7 days under standard atmospheric conditions and test shall be carried out as soon as possible after that. C-3 PROCEDURE Follow the procedure as prescribed in 3.3 of IS 101(Part 5/Sec 3). Ensure that the test coating shall face upwards and allow the steel ball to fall freely from a height of 2 m. C-3 OBSERVATIONS The material shall be deemed as pass if the paint system applied shall not show signs of cracking, flaking or detachment from panels or loss of adhesion between coats. A N N E X D D-1 Outline of Method. (Table 1, Sl No 9) DETERMINATION OF POT LIFE D-1.1 The two components of paint are mixed in appropriate proportions and time in which the paint becomes unusable by brushing is determined which is reported as pot life. D-2 Procedure. D-2.1 Two components of the paint are mixed thoroughly in appropriate ratio to provide 200 ml of the material. The paint shall be mixed by slow agitation with a stirring rod or mixing paddle 6

7 to avoid air entrapment. D-2.2 The paint is examined every 60 minute for its consistency and the time from the mixing till the paint becomes unusable by brush is reported as pot life. A N NE X E (Table 1, Sl No.10) SIEVE ANALYSIS OF PIGMENTS AND ABRASIVE MATERIALS E-1 OUTLINE OF METHOD. E-1.1 The pigments and abrasive materials are separated from the binder of the paint. The mixture of pigments and abrasive materials are analyzed for total abrasive content. E-2 APPARATUS. E-2.1 Glass beaker 500 ml Capacity and glass rod. E-2.2 Sieves: 600 micron, 120 micron and pan. E-2.3 Drying Oven capable to maintain at O C E-3 REAGENTS. E-3.1 Acetone (see IS: 170) E-3.2 Xylene, E-3.3 M.I.B.K (see IS:9850) E-3.4 Extraction mixture: Mix Xylene, M.I.B.K and Acetone in 4:4:2 ratio by volume E-4 PROCEDURE. E-4.1 Sieve Analysis. E Weigh accurately 100 gm of the mixed paint in a glass beaker. Add 200ml of extraction mixture and mix thoroughly using a glass rod. Allow the mixture to settle for 5 minutes. Decant the supernatant liquid through 120 micron sieve. Repeat the washing procedure 3-4 times using the extraction mixture. Final washing should be carried out with acetone. Dry the pigment and abrasive material with the beaker in an oven at O C till constant weight. Assemble the sieves in order of decreasing aperture, with the 600 micron sieve at the top and the 120 micron sieve at the bottom. E Carry out the sieving test as per the method given in IS:1607. E-5 TEST RESULTS E-5.1 The weight of the abrasive material retained on 120 micron sieve divided by percent pigment (determined as per method given in clause E shall be expressed as percent weight of the abrasive materials. F-0. GENERAL A N N E X F (Table 1, Sl No.11) RESISTANCE TO NATURAL OR ARTIFICIAL SEA WATER 7

8 F-0.1 Outline of the Method This is the test for determination of resistance of non-skid coating system to natural or artificial sea water spray condensation conditions. The coated panel is immersed in natural or artificial sea water for specified period and coated film examined for any deterioration. F-1 COMPOSITION OF NATURAL SEA WATER F-1.1 The natural sea water shall have a ph of 7.9 to 8.3 and a chlorinity of not less than 17 parts and salinity of 31 parts per NOTE The chlorinity and consequently salinity of natural sea water on the Indian coast line is subject to variations due to the monsoon. Dilution occurs during this period, lowering these values considerably. This period usually varies from 3 to 4 months during the year. In the other months, salinity is equal to or even higher than the artificial sea water but seldom exceeds 36 to 37 parts. This rise in salinity, however, has not a very significant effect on the test. F-2. COMPOSITION OF ARTIFICIAL SEA WATER F-2.1 The artificial sea water is prepared as described in 4.2 of IS 101(Part 6/Sec 1) F-3 APPARATUS F-3.1 As prescribed in 4.3 of IS 101(Part 6/Sec 1) F-4. TEST PANELS F-4.1 Preparation of Test Panels Prepare a panel of mm mild steel plate as described in Cl. 2 of IS:101 (Part 1/Sec 3). Apply a coat of the primer (conforming to IS:104) on both the sides to give a dry film mass in accordance with 101(Part 3/Sec 4) and allow to dry for 24 hours. Apply one coat of approved epoxy primer to give a thickness of microns and two coats of non-skid paint to a total dry film thickness of microns. The interval between each coat shall be 24 hrs. Allow the painted panels to dry for seven days at standard atmospheric conditions. NOTE - The grit blasted panel should be painted within four hours of the grit blasting. In case it is not possible the panels shall be preserved properly in a dessicater. F-4.2 Determine the thickness in micrometres, of the dry coating, by any appropriate method but using any one of the non-destructive method as prescribed in IS 101(Part 3/Sec 2). Seal the edges of the panel with wax up to a depth of 6 mm by dipping in molten wax. F-5 PROCEDURE Immerse the test panels at room temperature for a period of 4 weeks in natural or artificial sea water which is aerated by a continuous slow stream of air free from oil or grease. Examine the panels at the end of 4 weeks visually for signs of deterioration of the system. Also carefully remove 25 mm strip of the film from the centre of the panel along the length carefully with a suitable paint remover and examine the exposed metal for signs of corrosion, neglecting 25 mm portions of the exposed surface from each edge. F-6 OBSERVATIONS The material shall be deemed to have passed the test if the panel does not show any sign of corrosion and breakdown and not more than slight blistering. A N N E X G (Table 1, Sl No. 12) 8

9 G-1 OUTLINE OF METHOD. DETERMINATION OF RESISTANCE TO KEROSENE G-1 The epoxy non-skid paint coated panel immersed in Kerosene. Any deterioration of the film is examined after the specified period. G-2 TEST LIQUID G-2.1 Kerosene(see grade 1 of IS 1459) G-3 TEST PANEL G-3.1 Material and dimension - The test panel shall be of rectangular tinned steel plate of size approximately 200 mm x 200 mm. The other details shall be as precribed in 3.1 of IS 101(Part 1/Sec 3). This plate then to be prepard as burnished tinplate panels by the method as prescribed in 3.3, & of IS 101(Part1/Sec 3). G-3.2 Apply one coat of epoxy non-skid paint on both sides of the panel by brushing. The edges of the test panel, after coating with the paint, shall be sealed by suitable means The coated panels shall be dried for 7 days under standard atmospheric conditions and test shall be carried out as soon as possible after that. G-4 PROCEDURE G-4.1 Follow the procedure as prescribed in 4.2, 4.3, 4.3.1, 4.4.1, and of IS 101(Part 7/Sec 2). The panels (1/2 the length) shall be immersed in Kerosene for as period of four weeks. At the end of the test period remove the panel and wipe the immersed portion by dabbing with a soft rag. G-5 OBSEERVATIONS G-5.1 Examine the immersed portion of the test piece after a recovery period of one hour for any sign of deterioration of the coating, and if necessary, comparing with the unimmersed portion of the test piece G-5.2 Examine the immersed portion of the film for softening or deterioration. The film shall not show any sign of softening or deterioration resulting in its removal when rubbed with a soft rag. H-1 OUTLINE OF METHOD. A N N E X H (Table 1,Sl No.13) DETERMINATION OF RESISTANCE TO ABRASION H-1.1 The coated mild steel specimens are subjected to abrasion using emery paper strip and weight loss in milligrams of coating is recorded after 600 strokes. This provides an indication about the durability of the coating. H-2 APPARATUS. H-2.1 Erichsen Abrasion tester, Model 317. H-3 TEST PANEL H-3.1 Material and dimension - The test panel shall be of rectangular mild steel plate of size approximately mm. The other details shall be as prescribed in 2 of IS 101(Part 9

10 1/Sec 3). H-3.2 Apply three coats of epoxy non-skid paint on one side of the panel by brushing. A coating interval of 24 hrs, should be maintained between each coat. After application of third coat of paint, coating should be cured for seven days at standard atmospheric conditions and test shall be carried out as soon as possible after that. H-4 PROCEDURE. H-4.1 Clamp the specimen on abrasion tester and subject the surface to linear strokes of a emery paper (J 297) strip secured on periphery of a wheel. With each stroke, wheel rotates and exposes fresh emery surface for abrasion of the coating. The emery paper on the wheel should be replaced after one rotation completed in 200 strokes. The weight loss in 600 stokes to be recorded after the original texture has been smoothened by abrasion. The average loss in weight of the coating of three determinations should be reported. H-5 CALCULATIONS Weight loss, mg = W 1 W 2 Where, W 1 = Weight. after elimination of original texture, in mg W 2 = Weight after 600 strokes, in mg A N N E X J (Table 1, Sl No.14) DETERMINATION OF RESISTANCE TO THERMAL SHOCK J-1 OUTLINE OF METHOD. J-1.1 The painted panel is exposed to five cycles of heating and cooling at specified temperature. After five cycles of test, the paint film is examined for cracking, flaking or loss of adhesion. J-2 APPARATUS. J-2.1 Heating Oven maintained at C. J-3 TEST PANEL J-3.1 Material and dimension - The test panel shall be of rectangular mild steel plate of size approximately mm. The other details shall be as precribed in 2 of IS 101(Part 1/Sec 3). J-3.2 Apply approved epoxy primer to give a dry film thickness of microns. Apply three coats of epoxy non-skid paint on one side of the panel by brushing to give a dry film thickness of microns. A coating interval of 24 hrs, should be maintained between each coat. After application of third coat of paint, coated panels shall be cured for seven days at standard atmospheric conditions and test shall be carried out as soon as possible after that. J-4 PROCEDURE J-4.1 After 7 days curing place the panel in the oven maintained at C for 30 minutes. Immediately after 30 minutes of heating, immerse the panel in water at C for 15 minutes. This cycle shall be repeated for five times. 10

11 J-5 OBSERVATIONS J-5.1 After five cycles paint film is examined for cracking, flaking or loss of adhesion. A N N E X K (Table 1, Sl No.15) DETERMINATION OF RESISTANCE TO ACCELERATED WEATHERING K-1 OUTLINE OF METHOD K-1.1 The coated mild steel panels are exposed to cyclic UV radiation and condensation at controlled temperature limits for the specified period. Painted surface is examined for cracking and change in colour. K-2 APPARATUS K-2.1 Q.U.V. Accelerated Weathering Tester with UV-B Flourescent lamps, K-3 TEST PANEL K-3.1 Material and dimension - The test panel shall be of rectangular mild steel plate of size approximately mm. The other details shall be as precribed in 2 of IS 101(Part 1/Sec 3). K-3.2 Apply approved epoxy primer to give a dry film thickness of microns. Apply three coats of epoxy non-skid paint on one side of the panel by brushing to give a dry film thickness of microns. A coating interval of 24 hrs, should be maintained between each coat. After application of third coat of paint, coated panels shall be cured for seven days at standard atmospheric conditions and test shall be carried out as soon as possible after that. NOTE - The panel should grit blasted be painted within four hours of the grit blasting. In case it is not possible the panels shall be preserved properly in a desicator. K-4 PROCEDURE K-4.1 After 7 days curing, mount the panels in the specimen racks with painted surfaces facing the lamp. A cycle of 4 hours UV at 60 ± 3 0 C and 2 hours condensation at 40 ± 3 0 C shall be applied during testing. Care shall be taken to maintain the QUV Accelerated Tester, especially in respect of UV lamps, as per instructions given in the manufacturer s manual. Followm other details as prescribed in 6 of IS 101(Part 6/sec 5). The total exposure period shall be for250 hours. K-5 OBSERVATIONS K-5.1 After exposure for 250 h,, the painted panels shall be examined for cracking and change in colour. A slight change in colour towards lighter grey shall be acceptable. L-1 OUTLINE OF METHOD. A N N E X L (Table 1, Sl No.16) DETERMINATION OF NON-SKID PROPERTIES L-1.1 The painted panel is subjected to pull in contact with a loaded standard rubber surface. The forces necessary to slip and steadily slip of standard surface are noted and the coefficients of 11

12 friction both static and sliding are calculated. L-2 APPARATUS. L-2.1 The apparatus consists essentially of a device in which panel under test is held firmly on a movable platform in a horizontal position. The force necessary to slip the panel under loaded standard rubber surface is recorded. The force is measured using a suitable load-measuring unit, such as spring balance or load cell etc., having maximum load measuring capacity of 20 Kg with a least count of 0.1 Kg. The wire/string used for connecting platform should be of a non-ductile material. This wire/string should not have more than one 90 0 bend while connecting loaded rubber specimen and load measuring device. L-2.2 The standard rubber surface shall be of sizes 100 x 50 x 6 mm neoprene rubber and of hardness , (see IS ). The rubber shall be fixed in the middle of a stainless steel plate of sizes 200 x 100 x 1.5 mm. The plate will have a hole on one of its width side for securing wire to connect spring balance or load measuring unit. L-2.3 A load of 10 Kg, preferably with a handle, to facilitate lifting with a solid base of sizes 200 x 100 mm shall be used L-2.4 Oil OM-100 conforming to DEF STAN shall be used for measurements under oily conditions L-3 RUBEBR SPECIMEN L-3.1 A set of three rubber specimens will be used for the measurements, one each for dry, wet and oily condition. Before commencing the test every time, the surface shall be uniformly abraded with zero grade emery paper. The standard surfaces used for oily conditions shall be thoroughly washed with detergent solution to remove oil from its surface immediately after completion of test to avoid softening of the rubber by oil during storage. Care shall be taken to avoid contamination of the coating surface by touching or otherwise. L-3 TEST PANEL L-3.1 Material and dimension - The test panel shall be of rectangular mild steel plate of size approximately mm. The other details shall be as precribed in 2 of IS 101(Part 1/Sec 3). L-3.2 Apply approved epoxy primer to give a dry film thickness of microns. Apply two coats of epoxy non-skid paint on one side of the panel by brushing to give a dry film thickness of microns. A coating interval of 24 hrs, should be maintained between each coat. The first coat should be applied parallel and second coat in perpendicular direction of the panel. After application of second coat of paint, coated panels shall be cured for seven days at standard atmospheric conditions and test shall be carried out as soon as possible after that. Texture of paint on test panel should be compared with approved texture before undertaking friction measurement. The coated surface will be preserved for test and care shall be taken to avoid its contamination either by touching or otherwise. L-4 PROCEDURE L-4.1 Secure the test panel on the apparatus keeping painted surface facing upwards. Place the standard rubber surface in contact with non-skid coating. Place a load of 10.0 Kg on the standard surface and move the test panel at steady rate of 90 cm/min. Record the force, F1 in Kg, at which the panel starts to slip under loaded standard rubber surface. Also record force, F2 in Kg, at which the panel slips steadily under loaded standard surface. Conduct the test on the paint surface wetted with water and oil (OM-100) respectively ( see NOTE). Take three readings 12

13 for each determination on fresh coating surface and express the result as the average of these three readings. NOTE - Wetting of the non-skid surface shall be carried out by spreading water or oil with suitable brush. These shall be spread uniformly in such a way that there is no flooding of vallies on coated surface. L-4 CALCULATION. L-4.1 Calculate the result as follows: Co-efficient of static friction = F1/10 Where F1 = Force in Kg at which standard surface starts to slip. Co-efficient of sliding friction = F2/10 Where F2 = Pull in Kg at which standard surface slips steadily. 13