FOR BIS USE ONLY DOC:CHD 20 (1932)C December 2012 BUREAU OF INDIAN STANDARDS Draft Indian Standard TWO COMPONENTS HIGH BUILD EPOXY MICACIOUS IRON OXIDE (MIO) PIGMENTED INTERMEDIATE COAT SPECIFICATION (Not to be reproduced without the permission of BIS or used as STANDARD) Last date for receipt of comments is 31 03 2013 0. FORWARD (formal clauses will be added later) 1 SCOPE 1.1 This standard prescribes requirements and method of sampling and test for two component epoxy Micacious Iron oxide pigmented Intermediate coat. 1.2 This material is expected to have adhesion on inorganic zinc silicate coating and epoxy based primers, with high toughness and abrasion resistance. This material is used as an intermediate coat for the painting of steel equipments and steel structures of Thermal Power Plant where protections from salt water, chemicals, mineral oils, solvents and resistance to moisture, protection under marine/refinery conditions are required. 2. REFERENCES 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 For the purpose of this standard the terms and definitions used in IS 1303 shall apply. 4. REQUIREMENTS: 4.1 Composition Paints complying with this standard shall comprise of epoxy resin as the principal binder. The manufacturer shall specify that the principal type of binder used in the paint has epoxy equivalent in the range of 350 to 600. A test certificate preferably from a reputed testing agency 1
shall be furnished by the manufacturer confirming Micacious iron oxide by X-Ray Diffraction method. The composition shall be such that it satisfies the requirements specified in this standard. 4.1.1 The paint shall consist essentially of two components viz. base and hardener or catalyst solution to be mixed in the appropriate ratio by volume as specified by paint supplier to satisfy all the requirements of this standard. 4.2 Keeping Properties The material shall conform to all the requirements as mentioned in Table 1 for a minimum period of one year from the date of manufacture when stored in original sealed containers under normal atmospheric condition. 4.3 The material shall conform to the requirements given in Table 1. 5. TESTS 5.1 Unless specified otherwise, tests shall be conducted as prescribed in different parts of IS 101, preferably on the blasted panels. Reference to the relevant Sections of that standard are given in col 4 of Table 1. 5.2 The preparation of metal panels shall be according to IS 101 (Part 1/Sec 3) 5.3 Quality of Reagents Unless or otherwise specified, pure chemicals and distilled water (see IS 1070) Shall be employed. NOTE: Pure chemicals shall mean chemicals that do not contain impurities which affect the results of analysis. 5.4 Test certificate shall be in a format as agreed to between purchaser and supplier. 6. PACKING AND MARKING 6.1 Packing The material shall be packed in dual container. It shall ensure that the quality does not deteriorate during transit &storage and shall be as agreed to between Purchaser and supplier. 6.2 Marking 6.2.1 Each container shall be marked with the following information: i) Indication of the source of manufacture, ii) Batch number or Lot number in code or otherwise; iii) Month and year of manufacture; iv) Date of expiry, v) Mass of the material. vi) Mixing Ratio 6.2.2 BIS Certification Marking 6.2.1 The product may also be marked with the Standard Mark on the container. 6.2.1.1 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 2
Table 1 Requirements of Epoxy MIO pigmented Intermediate coat, (Clauses 4.3 and 5.1) s.no Characteristic Requirement Method of Test, Ref to IS Annex 101 (1) (2) (3) (4) (5) A) WET PAINT i) Mass in kg / 10 ltrs, Min 15.5 Part 1/ Sec 7 - ii) Consistency To pass the test B iii) Flash Point Above 20 c Part 1/ Sec 6 - iv) Drying time, Max a) Surface dry b) Hard dry 4 h 16 h Part 3/ Sec 1 v) Percent volume, solids 55 Part 8/ Sec 6 - Min vi) Micacious Iron oxide (as Fe2O3) % By Mass on 50 Clause 6 of IS 6947 (Part II) pigment (min) vi) Pot life, Min 6 h C NOTE: Tests from SI.No. (i) to (vi) are for mixed paint. B) DRY COAT i) Dry film thickness per 75-100 microns Part 3/ Sec 2 - coat, Min ii) Colour Brown Part 4/ Sec 2 - iii) Finish Egg shell/matt Part 3/ Sec 4 - v) Scratch hardness test To pass the test Clause 3 of Part 5/ Sec2 - (1 500g) vi) Flexibility and adhesion To pass the test Clause 2 of Part 5/ Sec2 - vii)** Resistance to humidity - under conditions of condensation at 500 h a) Resistance to to pass the test Clause 2 of Part 6/Sec 1 humidity for 500 h b) Resistance to salt spray for 500 h to pass the test Clause 3 of Part 6/Sec 1 ** These tests shall be conducted for a system consisting of one coat of Epoxy Zinc Phosphate Primer to IS 13238 or equivalent primer to be agreed upon between customer and supplier and one coat of intermediate paint. under which the Iicence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 7 SAMPLING 7.1 Representative samples of the material shall be drawn according to 6 of IS 101(Part1/Sec1). 3
A N N E X (Clause 2) A LIST OF REFERRED INDIAN STANDARDS IS No. Title IS 101 Methods of sampling and test for paints, varnishes and related products (Part 1/ Part 1 Test on liquid paints (general and physical), Sec 1) : 1986 Sec 1 Sampling (third revision) Sec 3) : 1986 Sec 3 Preparation of panels (third revision) Sec 5) : 1989 Sec 5 consistency (third revision) Sec 6) : 1987 Sec 6 Flash point (third revision) Sec 7) : 1987 Sec 7 (third revision) (Part 3/ Part 3 Test on paint film formation, Sec 1) : 1986 Sec 1 Drying time (third revision) Sec 2) : 1989 Sec 2 Film Thickness (third revision) Sec 4) : 1987 Sec 4 Finish (third revision) (Part 4/ Part 4 Optical tests on paint films Part 4 Optical tests on paint films Sec 2) : 1989 Sec 2 Colour (third revision) (Part 5/ Part 5 Mechanical tests on paint films Sec 1) : 1988 Sec 1 Hardness test (third revision) Sec 2) : 1988 Sec 2 Flexibility and adhesion tests (third revision) (Part 6/ Part 6 Durability test on paint films Sec 1) : 1988 Sec 1 Durability under conditions of condensation IS 1070 : 1992 Reagent grade Water (third revision) IS 1303 : 1983 Glossary of terms relating to paint (second revision) IS 6947 (Part II) -1975 Methods of estimation of composite pigments in Oil pastes, ready mixed paints and Enamels-Part II-Estimation of Zinc Chrome, Ferric Oxide and Aluminium. B-1 APPARATUS B-1.1 Palette Knife or Metal Rod B-1.2 Panels A N N E X B [Table 1, Sl No. ii)] CONSISTENCY B-1.2.1 Unless specified otherwise, steel panels described under 2 of IS 101(Part 1/Sec 3) shall be prepared. B-2 PROCEDURE B-2.1 Insert a clean metal rod or palette knife into the original container and examine the nature of settling. 4
B-2.2 Observations - The material shall not cake hard inside the container and shall be in such a condition that stirring easily produces a smooth uniform paint suitable for coating on steel A N N E X C [Table 1, Sl No. vi)] C-1 GENERAL DETERMINATION OF POT LIFE C-1.1 The time taken to double the viscosity from the original value shall be considered as the pot life of the material. C-2 PROCEDURE C-2.1 Thoroughly mix component parts in the ratio specified by the paint manufacturer to give a sample of 200 ml by volume. C-2.2 Within 10 minutes of mixing (B-2.1) determine the viscosity as prescribed in IS 101 (Part 1/Sec 5). C-2.3 Allow the mixed sample of paint to stand in a suitable air-tight container and determine the Viscosity at the end of the specified time. 5