1、SSPC-Paint 32November 1, 2006Reaffirmed with editorial revisions June 15, 20151SSPC: The Society for Protective Coatings Coating Specification No. 32Coal Tar Emulsion Coating1. Scope1.1 This specification covers a coal-tar emulsion coating to be used as a protective weather coat for hot- or cold-app
2、lied bituminous coatings on steel structures. It may also be used over suitable primers as a protective coating for aboveground steel structures subjected to atmospheric exposure and the deleteri-ous effects of oxidation and ultraviolet radiation.1.2 It is suitable for use on parts or structures exp
3、osed in SSPC Environmental Zone 1B (exterior, normally dry). It can also be used in heavy industrial environments such as Zones 3A (chemical exposure acidic), 3B (chemical exposure neutral), and 3C (chemical exposure alkaline) where color is not a prime consideration.2. Description2.1 The coating is
4、 a water emulsion of coal tar and may contain selected fillers. It is a thick, heavy-duty, cold-applied protective coating intended for use on steel substrates coated with hot- or cold-applied bituminous coatings or other suitable primers.2.2 The coating contains approximately 40 percent by volume n
5、on-volatile film-forming solids. The theoretical spreading rate for a 380-m (15-mil) dry film thickness is 1.1 m2/L (43 ft2/gal). Actual spreading rates can be significantly lower. 3. Referenced Standards3.1 The latest issue, revision, or amendment of the refer-enced documents in effect on the date
6、of invitation to bid shall govern unless otherwise specified. Those documents marked with an asterisk (*) are referenced only in the Notes or the Appendix, which are not requirements of this specification.3.2 If there is a conflict between the requirements of any of the cited reference documents and
7、 this specification, the requirements of this specification shall prevail.3.3 SSPC STANDARDS:Guide 13 Guide for the Identification and Use of Industrial Coating Material in Comput-erized Product Databases PA 2 Procedure for Determining Conformance to Dry Coating Thickness Requirements3.4 ASTM INTERN
8、ATIONAL STANDARDS:1D244 Standard Test Methods and Practices for Emulsified Asphalts D1141 Standard Practice for the Preparation of Substitute Ocean Water* D1475 Standard Test Method for Density of Liquid Coatings, Inks, and Related ProductsD1640 Standard Test Methods for Drying, Curing, or Film Form
9、ation of Organic Coatings at Room Temperature* D2369 Standard Test Method for Volatile Content of CoatingsD2939 Standard Test Methods for Emulsified Bitumens Used as Protective CoatingsD3924 Specification for Standard Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Mate
10、-rials D4587 Standard Practice for Fluorescent UV-Condensation Exposures of Paint and Related CoatingsD6132 Standard Test Method for Nonde-structive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic GageD6677 Standard Test Method for Evaluating Adhesion by KnifeD7091
11、Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals3.5 FEDERAL STANDARDS2MIL-PRF-2104 Lubricating Oil, Internal Combustion Engine, Combat/Tactical Service1 ASTM
12、International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. For referenced ASTM standards, visit the ASTM website, or contact ASTM Customer Service at For Annual Book of ASTM Standards volume information, refer to the standards Document Summary page on the ASTM website.2 US Department of
13、 Defense Single Stock Point (DoDSSP) for military standards may be accessed online at SSPC-Paint 32November 1, 2006Reaffirmed with editorial revisions June 15, 201523.6 UNITED NATIONS STANDARD3GHS Globally Harmonized System of Classifica-tion and Labelling of Chemicals (GHS), 4th Revised Edition.4.
14、Composition Requirements 4.1 The manufacturer is given wide latitude in the selec-tion of raw materials and manufacturing processes (see Notes 9.1.and 9.2).4.2 RESIN REQUIREMENT: The coating shall be an emulsified coke-oven coal tar of such consistency as to be readily applicable either by brush or
15、by spray. The coating may be formulated to contain mineral filler. The coal tar used in this coating is defined as a product obtained from the distillation of high-temperature crude coke oven tar, which in itself is a product obtained during the destructive distillation of coal in slot ovens operate
16、d at a temperature above 700 C (1300 F). The coal tar shall be composed primarily of a complex combination of condensed ring aromatic hydrocarbons of three or more members. The coating shall not contain asphalt or asbestos.5. Requirements of Liquid Coating5.1 RESIDUE: The percent by weight (wt %) of
17、 residue by evaporation shall be a minimum of 45 wt % when tested in accordance with ASTM D2939.5.2 ASH CONTENT: The ash content of the residue shall be from 25 to 40 wt % when tested in accordance with ASTM D2939.5.3 WATER CONTENT: The percent by weight of water shall not be greater than 50 wt % wh
18、en tested in accordance with ASTM D244.5.4 CONDITION IN CONTAINER: Moderate water sepa-ration, without packing hard in the container, is acceptable. Any water that separates shall be readily incorporated upon stirring. 5.5 WORKING PROPERTIES: The coating shall be designed for application by brush or
19、 spray in accordance with the Directions for Use (see Section 7.3). When applied to vertical surfaces at the manufacturers specified thickness, the coating shall not sag (see Section 6.1).5.6 ODOR: The coating shall not have a pronounced or unduly objectionable odor.3 United Nations Economic Commiss
20、ion for Europe, Transport Division, Palais des Nations, CH - 1211 Geneva 10, Switzerland. Copies of this standard may be obtained from the United Nations Publications Customer Service, National Book Network, 15200, 15200 NBN Way, Ridge Summit PA 17124 6. Laboratory Physical Tests of Applied FilmsUnl
21、ess otherwise specified herein, or in referenced test methods, properties will be tested at standard atmospheric conditions as specified in ASTM D3924.6.1 SAG: The coating shall not sag when tested as fol-lows: Press a strip of 2.5 cm (1 inch) masking tape across the full width of a solvent-cleaned
22、75 x 150 mm (3 x 6 inch) cold-rolled steel panel. The tape shall be parallel to and cen-tered on the shorter axis of the panel. Apply the material to the panel at a wet film thickness of 965 50 m (38 2 mils). The application may be made with a doctor blade according to ASTM D1640. Immediately after
23、applying the material, carefully remove the masking tape and stand the panel in a vertical position (with the bare strip horizontal) in a draft-free 23 3 C (73 5 F) location. Examine the panel after 24 hours. Sagging or running of the coating into the bare area shall constitute failure of the materi
24、al to pass the sag test. 6.2 ADHESION: A single coat of the material shall be ap-plied to a dried bituminous coating such as SSPC-Paint 33 at a wet film thickness of 965 50 m (38 2 mils). Ninety-six hours after application, the adhesion shall be tested according to ASTM D6677. The adhesion value sha
25、ll be 10.6.3 WATER ABSORPTION: Determine the water absorp-tion by the following method: Record tare weights of three aluminum panels, each 75 x 150 x 0.8 mm (3 x 6 x 1/32 inch) Apply one coat of the coating to a uniform wet film thickness of 965 50 m (38 2 mils). After the coating has dried for 96 h
26、ours, dip each panel momentarily in distilled water, wipe lightly with a paper towel, and weigh each panel to determine the weight of coating on the panel. Immerse the coated panels in distilled water at temperature of 23 3 C (73 4 F) per ASTM D3924 for 15 days Remove the panels, wipe lightly with a
27、 paper towel, and weigh again. Subtract the weights recorded after the initial dipping from those taken after the 15-day immersion to determine the weight of water absorbed. Determine the weight percent of water absorbed by the coating for each test panel.The average of the three weight percents sha
28、ll be no more than 10. In addition, the coating on each panel shall show no observable signs of softening or separation. 6.4 RESISTANCE TO OIL: Apply the coating to two wire-brushed, coal-tar naphtha solvent-cleaned mild steel panels, each 75 x 150 x 3 mm (3 x 6 x 1/8 inch) to a uniform wet film thi
29、ckness of 965 50 m (38 2 mils). After the coating has dried for 96 hours, immerse the coated panels SSPC-Paint 32November 1, 2006Reaffirmed with editorial revisions June 15, 20153in MIL-PRF-2104, grade 30 lubricating oil, for 24 hours. The coating shall exhibit no observable softening. There shall b
30、e no observable loss of adhesion, or any other deterioration.6.5 ACCELERATED WEATHERING: To three aluminum panels, each approximately 75 x 150 x 0.8 mm (3 x 6 x 1/32 inch) size may vary as required by accelerated weathering unit, apply two coats of the coating to produce a uniform dry film thickness
31、 of 760 50 m (30 2 mils), as measured by ASTM D7091 or ASTM D6132, using protocol provided in SSPC-PA 2, Appendix 5. Apply the two coats at right angles to each other, with a drying period of 24 hours between coats. Af-ter the second coat has dried for 96 hours, subject the coated panels to 15 days
32、of accelerated weathering in accordance with ASTM D4587. At the end of the period, examine visually for disbonding, cracking, crazing, or alligatoring. Alligatoring configurations on the immediate surface but not through to the substrate are acceptable.6.6 WATER RESISTANCE: Prime three aluminum pane
33、ls, each approximately 75 x 150 x 0.8 mm (3 x 6 x 1/32 inch) with a bituminous coating such as SSPC-Paint 33. After thorough drying, apply a single coat of the material at a wet film thickness of 965 50 m (38 2 mils). After 96 hours, immerse the coated panels in substitute ocean water meeting the re
34、quirements of ASTM D1141 for 15 days. The coating shall not soften or delaminate from the primer.A summary of test requirements is provided in Table 1.7. Labeling 7.1 Labeling shall conform to the GHS standard.7.2 Technical data shall be provided for at least all data elements categorized as “essent
35、ial” in SSPC-Guide 13.7.3 DIRECTIONS FOR USE: The following directions for use shall be supplied with each container of coating:Directions for Use of Coal-Tar Emulsion CoatingThis emulsion coating is primarily designed to be used as a topcoat over hot- or cold-applied bituminous coatings. It may als
36、o be used as a protective coating over other suitable primers for atmospheric protection of metal substrates in heavy industrial atmospheres.Mix coating thoroughly before use. Under normal con-ditions, no thinning should be necessary. Thin only when necessary, using only clean potable water.If appli
37、ed by brush, a proper technique must be developed to ensure application of correct thickness. If coating large areas, spray application is recommended using either high pressure airless or conventional spray equipment designed for the application of mastics.Apply to the specified dry film thickness,
38、 or, if none is specified, 380 m (15 mils) or approximately 965 m (38 mils) wet. The surface to be coated shall be dry, the surface temperature shall be at least 3 C (5 F) above the dew point, and the temperature of the surface shall be over 4.5 C (40 F). Do not apply outdoors in rainy weather or if
39、 freezing temperatures are expected before the coating dries. Under normal conditions, this coating will be dry for recoating in two to six hours. High relative humidity may require 24 to 48 hours between coats. After the surface dries, the coating will remain soft for long periods.Protect stored co
40、ntainers from freezing.8. Disclaimer8.1 While every precaution is taken to ensure that all information furnished in SSPC standards and specifications PROPERTYREQUIREMENTSTEST METHOD/SECTIONMIN. MAXResidue by Evaporation, wt % 45 - ASTM D 2939Ash content of residue, wt % 25 40 ASTM D 2939Water conten
41、t, wt % - 50 ASTM D 244Sag No appreciable sag or flow while wet Section 6.1Adhesion 10 - ASTM D 6677Water absorption, wt % (with no softening or separation)- 10 Section 6.3Resistance to oil No softening or loss of adhesion Section 6.4Accelerated weathering No disbanding, cracking, crazing, or alliga
42、toring Section 6.5Water resistance No softening or evidence of delamination Section 6.6TABLE 1TEST SUMMARYSSPC-Paint 32November 1, 2006Reaffirmed with editorial revisions June 15, 20154is as accurate, complete, and useful as possible, SSPC can-not assume responsibility nor incur any obligation resul
43、ting from the use of any materials, coatings, or methods specified herein, or of the specification or standard itself.8.2 This specification does not attempt to address problems concerning safety associated with its use. The user of this specification, as well as the user of all products or practice
44、s described herein, is responsible for instituting appropriate health and safety practices and for ensuring compliance with all governmental regulations.9. Notes Notes are not requirements of this specification.9.1 VOC CONTENT: Each coating, after recommended thinning, must conform to published gove
45、rnment regulations regarding volatile organic compound (VOC) content. VOC information should be supplied on the label or the technical data sheet. Various governmental agencies may have different VOC limits or use different methods of testing. The owner may modify this specification as necessary to
46、specify a particular VOC content limit consistent with local regulations. Coatings meeting the composition and performance requirements of this specification usually have a VOC level between 70 and 110 g/L (0.6 and 0.9 lb/gal).9.2 QUALITY ASSURANCE TESTS: If the user chooses, tests may be used to de
47、termine the acceptability of a lot or batch of a qualified coating. The quality assurance tests are used to determine whether the supplied products are of the same type and quality as those originally tested and certified for acceptance. The selected tests should accurately and rapidly measure the p
48、hysical and chemical characteristics of the coating necessary to verify that the supplied material is substantially the same as the previously accepted material. All of the quality assurance tests must be performed on the originally submitted qualification sample. The results of these tests are used
49、 to establish pass/fail criteria for quality assurance testing of supplied products.9.2.1 Establishing Quality Assurance Acceptance Criteria: Many ASTM test methods contain precision and bias statements. Specification developers should be cognizant of the fact that these statements exist. Quality assurance test criteria should not be more stringent than the inter-laboratory precision of the test methods used. The specifier may require additional technical data to satisfy quality assurance or local regulatory requirem
