1、SSPC-PS 27.00June 1, 2000Editorial Revisions November 1, 20045-157SSPC: The Society for Protective CoatingsCOATING SYSTEM NO. 27.00Alkyd Coating System Materials Specifi cation, Performance-Based1. Scope1.1 This specifi cation covers the requirements for an air-drying solvent-based alkyd coating sys
2、tem consisting of two or more coats of alkyd intended for use over blast cleaned steel (See Note 13.1.). The specifi cation covers both the system and the individual coating requirements. The requirements are based primarily on the performance of the coating system.1.2 The coating system is suitable
3、 for exposure in Environ-mental Zones 1A (interior, normally dry), 1B (exterior, normally dry), 2A (frequently wet by fresh water, excluding immersion), and 2B (frequently wet by salt water, excluding immersion) (See Note 13.2.). The coating system is classifi ed according to the drying time (fast,
4、medium, slow) of the slowest drying coating layer.2. Description2.1 This multi-coat alkyd coating system specifi cation does not cover coating systems comprised of water-reducible alkyds.2.2 DRYING TIME: The coating system shall be classi-fi ed as Type 1 (fast drying), Type 2 (medium drying), or Typ
5、e 3 (slow drying). See Section 6.4 regarding test methods and criteria for drying time.2.3 FINISH COAT GLOSS: The fi nish coat shall be designated as fl at, semigloss, or gloss in accordance with Section 7.3.3. Referenced Standards3.1 The latest issue, revision, or amendment of the referenced standa
6、rds in effect on the date of invitation to bid shall govern, unless otherwise specifi ed. Standards marked with an asterisk (*) are referenced only in the Notes, which are not requirements of this specifi cation.3.2 If there is a confl ict between the requirements of any of the cited referenced stan
7、dards and this specifi cation, the requirements of this specifi cation shall prevail.3.3 SSPC STANDARDS AND JOINT STANDARDS:Guide 13 Guide for the Identifi cation and Use of Industrial Coating Systems in Comput-erized Product DatabasesPA 1 Shop, Field, and Maintenance Painting of SteelPA 2 Measureme
8、nt of Dry Coating Thickness with Magnetic GagesSP 1 Solvent Cleaning SP 5/NACE No. 1 White Metal Blast CleaningVIS 2 Standard Method of Evaluating Degree of Rusting on Painted Steel Surfaces3.4 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) STANDARDS:A 36 Standard Specifi cation for Carbon Struct
9、ural SteelA 607 Standard Specifi cation for Steel, Sheet and Strip, High-Strength, Low-Alloy, Columbium or Vanadium, or Both, Hot-Rolled and Cold-Rolled (Withdrawn 2000; Replaced by A1008 and A1011/A1011M)D 522 Standard Test Methods for Mandrel Bend Test of Attached Organic CoatingsD 523 Standard Te
10、st Method for Specular Gloss* D 562 Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-type ViscometerD 714 Standard Test Method for Evaluating Degree of Blistering of Paints* D 823 Standard Practices for Producing Films of Uniform Thickness of Paint,
11、Varnish, and Related Products on Test Panels* D 1296 Standard Test Method for Odor of Volatile Solvents and Diluents* D 1475 Standard Test Method for Density of Liquid Coatings, Inks, and Related Products* D 1535 Standard Practice for Specifying Color by the Munsell System D 1640 Standard Test Metho
12、ds for Drying, Curing, or Film Formation of Organic Coatings at Room TemperatureD 1654 Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments* D 2369 Standard Test Method for Volatile Content of Coatings* D 2371 Standard Test Method for Pigment Content
13、 SSPC-PS 27.00June 1, 2000Editorial Revisions November 1, 20045-158of Solvent-Reducible Paints* D 2621 Standard Test Method for Infrared Identifi ca-tion of Vehicle Solids from Solvent-Reducible PaintsD 3359 Standard Test Methods for Measuring Adhe-sion by Tape TestD 3363 Standard Test Method for Fi
14、lm Hardness by Pencil TestD 3925 Standard Practice for Sampling Liquid Paints and Related Pigmented CoatingsD 4417 Standard Test Methods for Field Measure-ment of Surface Profi le of Blast Cleaned SteelD 4585 Standard Practice for Testing the Water Resistance of Coatings Using Controlled Condensatio
15、nD 4940 Standard Test Method for Conductimetric Analysis of Water-Soluble Ionic Contamina-tion of Blasting AbrasivesD 5894 Standard Practice for Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating Exposures in a Fog/Dry Cabinet and a UV/Condensation Cabinet)3.5 AMERICAN NATIONAL STANDARDS INS
16、TITUTE (ANSI) STANDARD:Z129.1 Hazardous Industrial Chemicals-Precautionary Labeling3.6 FEDERAL SPECIFICATIONS AND STANDARDS:FED-STD-141 Paint, Varnish, Lacquer and Related Materials: Methods of Inspection, Sampling and Testing Method 3011 Condition in Container Method 3021 Skinning (Partially Filled
17、 Container)Method 4321 Brushing Properties Method 4331 Spraying Properties Method 4541 Working Properties and Appearance of Dried Film 4. Composition Requirements of Coating4.1 RESIN REQUIREMENT: The resin component (non-volatile vehicle) shall be a minimum of 50% by weight of alkyd. An alkyd resin
18、is defi ned as a resin system primarily derived from the esterifi cation reaction product of a polyhydric alcohol and a polybasic acid, fatty acid, or oil. The specifi cation permits latitude to the coating supplier in the choice of alkyd resins. Modifi ed alkyd resins, including cross reaction prod
19、ucts with other common resin forming polymers, are allowed. These include, but are not restricted to, urethane modifi ed alkyd resins and alkyd phenolic resins(See Note 13.3.).4.2 PIGMENT REQUIREMENT: Lead or chromate based pigments are prohibited (See Note 13.4.).5. Standard Testing Conditions5.1 A
20、TMOSPHERIC CONDITIONS: When testing the paint and its application, the temperature under which it is applied and cured shall be 23 2C (73.5 3.5F).5.2 SUBSTRATE: The hot rolled steel test panels shall conform to ASTM A 670, Grade 50 (See Note 13.5.).5.3 TEST PANELS: Steel test panels measuring 75 mm
21、x 150 mm x 3.2 mm (3 inch x 6 inch x 1/8 inch) or greater shall be blast cleaned to SSPC-SP 5/NACE No. 1. Test panels shall be solvent cleaned in accordance with SSPC-SP 1 prior to blast cleaning. The type of blast media shall be clearly identifi ed and have conductivity less than 100 S per ASTM D 4
22、940. The panels shall have a nominal anchor pattern of 50 25 m (2.0 1.0 mils) per ASTM D 4417.5.4 APPLICATION: Apply the paint at the atmospheric conditions described in Section 5.1 in accordance with SSPC-PA 1 by spray to the front of the test panels. (See Note 13.6.) The number of coats shall be s
23、elected to match the manufacturers recommendations.5.5 DRY FILM THICKNESS: The dry fi lm thickness (DFT) shall be within the manufacturers written recommended range per coat and shall not exceed the stated minimum by more than 25 micrometers (1 mil). If there is no recommended fi lm thickness, then
24、the thickness shall be 50 13 micrometers (2.0 0.5 mils) per coat. The fi lm thickness shall be measured in accordance with SSPC-PA 2 (See Note 13.7.).5.6 CURE: Prior to any exposure testing, all panels shall be cured for a minimum of 14 and a maximum of 30 days at 16 to 27C (60 to 80F) and 35 to 65%
25、 relative humidity after application of the fi nal coat.5.7 SCRIBING: Scribe two parallel lines on the face of the coated panels so as to expose the underlying metal before testing. The lines shall be at least 1.2 cm (0.5 inch) from the edge, the top, and the bottom of each panel and at least 5 cm (
26、2 inches) from each other. Each scribe shall be at least 6 cm (2.4 inches) long. The scribes may run vertically or at an angle across the face of the panel. Follow the scribe-making procedure described in ASTM D 1654.6. Requirements of Liquid Coating6.1 WORKING PROPERTIES: The paint shall be easily
27、applied by brush, roller, or spray when tested in accordance with FED-STD-141, Methods 4321, 4331, and 4541. The paint shall show no streaking, running, or sagging during application SSPC-PS 27.00June 1, 2000Editorial Revisions November 1, 20045-159or while drying. 6.2 CONDITION IN CONTAINER: The pa
28、int shall show no thickening, curdling, gelling, or hard caking when tested as specifi ed in FED-STD-141, Method 3011, after storage for six months from the date of delivery, in a full, tightly covered container, at a temperature of 10 to 43C (50 to 110F). 6.3 SKINNING: There shall be no skinning in
29、 a three-quarters fi lled closed container after 48 hours when tested in the standard manner specifi ed in FED-STD-141, Method 3021.6.4 DRYING TIME6.4.1 Drying time for each coating shall be the dry-hard time as measured in accordance with ASTM D 1640. The coating system shall be classifi ed accordi
30、ng to the maximum drying time of the slowest drying coating as follows:6.4.2 Type 1 Fast Drying: Less than or equal to 8 hours6.4.3 Type 2 Medium Drying: 9 to 16 hours6.4.4 Type 3 Slow Drying: 17 to 36 hours 7. Laboratory Physical Tests of Applied Films7.1 FLEXIBILITY OF COATING SYSTEM: Prepare thre
31、e test panels in accordance with Sections 5.1, 5.4, 5.5, and 5.6. The substrate shall be cold rolled strip 0.8 mm (1/32 inch) (22 gage) thick. Surface preparation shall be SSPC-SP 1. Recommended panel size is 100 mm x 150 mm (4 inch x 6 inch). Test triplicate panels in accordance with ASTM D 522. Th
32、e elongation of each panel shall be a minimum of 28 percent using Test Method A or, if Test Method B is used, each replicate panel must exhibit no cracking when bent over a 3.2 mm (1/8 inch) diameter mandrel. 7.2 HARDNESS OF COATING SYSTEM: Prepare three test panels in accordance with Sections 5.1,
33、5.4, and 5.5. The substrate shall be any suitable thin gage minimum 1.6 mm (1/16 inch) steel panels. Surface preparation shall be SSPC-SP 1. Each panel shall exhibit minimum pencil hardness of 3B in accordance with ASTM D 3363 after 30 days air-dry at ambient temperature following the application of
34、 the fi nal coat.7.3 GLOSS: The specular gloss of the fi nish coat shall be tested in accordance with ASTM D 523. A fl at alkyd fi nish coat shall have a maximum 85 degree specular gloss of 10. A semigloss alkyd fi nish coat shall have a 60 degree specular gloss between 30 and 60. A gloss alkyd fi n
35、ish coat shall have a 60 degree specular gloss greater than 60. Gloss of the primer and the intermediate coats shall be such that adequate adhe-sion shall occur between coats.7.4 ADHESION: Prepare one panel in accordance with Sections 5.1 through 5.6. Perform the adhesion tape test in accordance wit
36、h ASTM D 3359 at three different locations on the panel. Each test shall have a rating of 5A or 5B. For fi lms thicker than 125 m (5 mils), use Test Method A of ASTM D 3359.8. Accelerated Laboratory Weathering Tests8.1 CONDENSING HUMIDITY CABINET TEST: Prepare triplicate panels in accordance with Se
37、ctions 5.1 through 5.6. Expose the panels for 500 hours in a condensation cabinet in accordance with ASTM D 4585.8.1.1 Rust Evaluation: After 500 hours, each of the rep-licates shall have a minimum rust rating of 9 per SSPC-VIS 2. 8.1.2 Blister Evaluation: After 500 hours, blister ratings for each o
38、f the three specimens shall be no worse than No. 8 Few per ASTM D 714. (See Note 13.8.)8.2 CYCLIC SALT FOG/UV EXPOSURE TEST: Prepare triplicate panels in accordance with Section 5. Coat and seal all edges and the back side of each panel with a coating or masking that will provide the necessary prote
39、ction to these surfaces. Expose the panels in accordance with ASTM D 5894 for 1008 hours (6 weeks).8.2.1 Rust Evaluation: After 1008 hours, each test panel shall have a minimum rust rating of 9 per SSPC-VIS 2.8.2.2 Blister Evaluation: After 1008 hours, each test panel shall have a blister rating of
40、10 (no blisters) per ASTM D 714.8.2.3 Scribe Undercutting Evaluation: After 1008 hours, measure the maximum undercutting from the center of the scribe at any point along the scribe on both sides of each scribe. Each scribe will thus provide two data points: the maximum undercutting on the right side
41、 of the scribe and the maximum undercutting on the left side of the scribe. Three replicate panels, each with two scribes, will provide 12 data points. Compute the mean (average), x, and the standard de-viation, s, of these 12 data points. The scribe undercutting test parameter, U, is the mean plus
42、two standard deviations (U = x + 2s). The scribe undercutting test parameter, U, rounded to the nearest millimeter, shall be less than or equal to 12 mm.9. Material Quality Assurance9.1 If the user chooses, tests may be used to determine the acceptability of a lot or batch of a qualifi ed coating (S
43、ee SSPC-PS 27.00June 1, 2000Editorial Revisions November 1, 20045-160Note 13.9.).10. Labeling10.1 Labeling shall conform to ANSI Z129.1. 10.2 Technical data shall be provided for at least all data elements categorized as “essential“ in SSPC-Guide 13.11. Inspection11.1 All coatings supplied under thi
44、s specifi cation are subject to timely inspection by the purchaser or his authorized representative. The purchaser shall have the right to reject any materials supplied which are found to be defective under this specifi cation. (See Note 13.9.) In case of dispute, unless otherwise specifi ed, the ar
45、bitration or settlement procedure established in the procurement documents shall be followed. If no arbitration or settlement procedure is established, then a procedure mutually agreeable to purchaser, material supplier, and contractor shall be used. 11.2 Samples of paints under this painting system
46、 may be requested by the purchaser and shall be supplied upon request along with the manufacturers name and identifi ca-tion for the materials. Samples may be requested at the time the purchase order is placed or may be taken from unopened containers at the job site.11.3 Unless otherwise specifi ed,
47、 the sampling shall be in accordance with ASTM D 3925.12. Disclaimer12.1 While every precaution is taken to ensure that all information furnished in SSPC standards and specifi cations is as accurate, complete, and useful as possible, SSPC cannot assume responsibility nor incur any obligation resulti
48、ng from the use of any materials, coatings, or methods specifi ed herein, or of the specifi cation or standard itself.12.2 This specifi cation does not attempt to address prob-lems concerning safety associated with its use. The user of this specifi cation, as well as the user of all products or prac
49、tices described herein, is responsible for instituting appropriate health and safety practices and for insuring compliance with all governmental regulations.13. NotesNotes are not requirements of this specifi cation.13.1 The alkyd coating system described may be suitable on hand cleaned steel. Consult manufacturer for performance or other data supporting this usage.13.2 SSPC Environmental Zones covered in this specifi ca-tion are as follows:Zone 1A: Interior, normally dry (or temporary protec-tion). Very mild (oil base coatings now last six years or more).Zone
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