1、5-145SSPC-PS 24.00August 1, 1991Editorial Revisions November 1, 2004SSPC: The Society for Protective CoatingsPAINTING SPECIFICATION NO. 24.00Latex Painting System for Industrial and Marine Atmospheres, Performance-Based1. Scope1.1 This specifi cation covers a painting system for steel surfaces based
2、 on multiple coats of air-drying, single- component latex paints having a total dry fi lm thickness of a minimum of six mils (152 micrometers).1.2 A painting system is categorized according to its performance level over blast-cleaned steel, the intended substrate (See Note 11.1).1.3 The system is su
3、itable for exposure in Environmental Zones IA (interior, normally dry), IB (exterior, normally dry), 2A (frequently wet by fresh water), 2B (frequently wet by salt water), 3A (chemical exposure, acidic), 3B (chemical exposure, neutral), 3C (chemical exposure, alkaline) and 3D (chemical exposure, mil
4、d solvent).1.4 The system is not intended for immersion service.2. Description2.1 SYSTEM COMPOSITION: The painting system is comprised of paints based on pigmented emulsion (latex) binders.2.2 VOC CONTENT:2.2.1 The painting system may or may not comply with all air pollution regulations. Consult app
5、licable government regulations to determine maximum allowable VOC and proper VOC determination test method for a particular application. The manufacturer shall provide VOC information about the paints as supplied (in the container) and as applied in the fi eld after recommended thinning (See Notes 1
6、1.2 and 11.3).2.3 PERFORMANCE LEVELS2.3.1 Painting systems shall be classifi ed according per-formance achieved as follows:Level 1: Accelerated Laboratory TestingLevel 2: Test Fence and Laboratory EvaluationLevel 3: Long-Term Exterior Exposure2.3.2 If no performance level is specifi ed, Level 2 is a
7、ssumed.3. Referenced Standards3.1 The latest issue, revision, or amendment of the refer-enced standards in effect on the date of invitation to bid shall govern, unless otherwise specifi ed.3.2 If there is a confl ict between the requirements of any of the cited referenced standards and this specifi
8、cation, the requirements of this specifi cation shall prevail.3.3 SSPC STANDARDS:PA 1 Shop, Field, and Maintenance Painting of SteelSP 5/NACE No. White Metal Blast CleaningVIS 2 Standard Method of Evaluating Degree of Rusting on Painted Steel Surfaces3.4 AMERICAN SOCIETY FOR TESTING AND MATERIALS (A
9、STM) STANDARDS:B 117 Standard Practice for Operating Salt Spray (Fog) ApparatusD 523 Standard Test Method for Specular GlossD 562 Standard Test Method for Consistency of Paints Using the Stormer ViscometerD 610 Standard Test Method for Evaluating Degree of Rusting on Painted Steel SurfacesD 714 Stan
10、dard Test Method for Evaluating Degree of Blistering of PaintsD 1200 Standard Test Method for Viscosity by Ford Viscosity CupD 1211 Standard Test Method for Temperature-Change Resistance of Clear Nitrocellulose Lacquer Films Applied to WoodD 1475 Standard Test Method for Density of Liquid Coatings,
11、Inks, and Related ProductsD 1654 Standard Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive EnvironmentD 2369 Standard Test Method for Volatile Content of CoatingsD 3359 Standard Methods for Measuring Adhesion by Tape Test5-146SSPC-PS 24.00August 1, 1991Editorial Revisions
12、November 1, 2004D 3925 Standard Practice for Sampling Liquid Paints and Related Pigmented CoatingsD 3960 Standard Practice for Determining Volatile Organic Content (VOC) of Paints and Related CoatingsD 4417 Standard Test Methods for Field Measurement of Surface Profi le of Blast Cleaned SteelD 4587
13、Standard Practice for Conducting Tests on Paint and Related Coatings and Materials Using a Fluorescent UV Condensation Light- and Water-Exposure ApparatusG 53 Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) For Exposure of Non-Metallic Materials (Withdrawn 2000; Repl
14、aced withASTM G 155.)G 92 Standard Practice for Characteristics of Atmospheric Test SitesG 151 Standard Practice for Exposing Non-Metallic Materials in Accelerated Test Devices that Use Laboratory Light Sources3.6 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) STANDARD:Z129.1 Hazardous Industrial Chem
15、icalsPrecautionary Labeling 3.7 FEDERAL STANDARDS:EPA Method 24 Determination of Volatile Matter Content, Water Content, Density, Volume Solids and Weight Solids of Surface Coatings (40 CFR Ch1, Part 60, Appendix A)4. Composition4.1 VEHICLE: The vehicle for the paints in this painting system is base
16、d on a stable polymer emulsion in an aqueous medium.4.2 PIGMENT: The primer may contain environmentally compliant corrosion-inhibiting pigments. This does not preclude use of a non-inhibitive pigment-containing primer as long as the requirements of this specifi cation are met.4.3 GENERAL: The manufa
17、cturer is given latitude in the selection of other compositional ingredients provided that the paint and the painting system meet the requirements of this specifi cation.5. Performance Requirements5.1 ACCELERATED LABORATORY TESTING(LEVEL 1): For Level 1 the painting system shall meet the requirement
18、s of Sections 6.2 through 6.4.5.2 TEST FENCE AND LABORATORY EVALUATION (LEVEL 2): For Level 2 the painting system shall meet the requirements of Sections 6.2, 6.3, and 6.5.5.3 LONG-TERM EXTERIOR EXPOSURE (LEVEL 3): For Level 3 the painting system shall meet the requirements of Sections 6.2, 6.3, and
19、 6.6. (See Note 11.4.)6. Testing Procedures6.1 STANDARD LABORATORY TESTING CONDITIONS: For purposes of this specifi cation, standard temperature shall be 73.5 3.5F (23 2C) and standard relative humidity shall be 50% 5%. The standard substrate shall be 4 inch x 12 inch x 1/8 inch (10 cm x 31 cm x 3.2
20、 mm) thick ASTM A 569 hot-rolled steel abrasive blasted in accordance with SSPC-SP 5 to a profi le of 1.7 0.5 mils (43 13 micrometers). Measure blast profi le in accordance with ASTM D 4417.6.2 ADHESION: Apply the complete paint system to two panels according to the manufacturers suggested fi nishin
21、g schedule. After drying for 14 days at standard conditions, adhesion of the system to the steel shall be determined us-ing the ASTM D 3359 cross-hatch adhesion test. Each of the specimens shall have a minimum adhesion rating of 3A.6.3 EARLY RUST RESISTANCE OF SYSTEM:6.3.1 Prepare and equilibrate a
22、refrigerator at 50F (10C) and approximately 75 to 80% relative humidity. Condition the paints to be applied and the panels in the refrigerator for at least 45 minutes.6.3.2 Remove panels from refrigerator and apply one coat of primer, 1.4 to 1.8 mils (36 to 45 micrometers) dry above the profi le, an
23、d return panels to the refrigerator. Dry for four hours or until fi lm is dry to touch (See Notes 11.5 and 11.6.). Again remove panels and apply one coat of topcoat (preferably white) at 1.4 to 1.8 dry mils (36 to 46 micrometers) and return panels to the refrigerator. Dry until fi lm is dry to touch
24、.6.3.3 Expose panels under continuous wet or condensing conditions at ambient temperature for approximately 16 hours (See Note 11.7). At the end of 16 hours, immediately examine for rusting and blistering. The rusting shall not exceed 9 as judged by SSPC-VIS 2, and blistering shall not exceed 8F acc
25、ording to ASTM D 714.5-147SSPC-PS 24.00August 1, 1991Editorial Revisions November 1, 20046.4 ACCELERATED LABORATORY TESTING:6.4.1 Accelerated Weathering Test: Apply the painting system to four panels, prepared as described in Section 6.1, according to the manufacturers recommendations. After drying
26、for two weeks at standard conditions, expose panels in the apparatus described in ASTM G 53 (equipped with a UVA-340 Bulb) for 1,000 hours. (See Note 11.8.) The test cycle is four hours UV exposure (135F, 57C) followed by four hours of condensation (112F, 44C) (See Note 11.9). There shall be no crac
27、king, rusting, or blistering (See Note 11.10).6.4 .2 Thermal Shock Test: Allow panels tested in Section 6.4.1 to equilibrate at least 16 hours. Test panels in accordance with the procedure of ASTM D 1211 for ten cycles. One cycle in this test constitutes a period of high temperature followed by expo
28、sure to low temperature and then a return to room temperature. Panels should be patted dry with cheesecloth if wet, taking care not to disturb the coated surface. There shall be no checking or cracking (See Note 11.11).6.4.3 Salt Fog Test: Allow panels tested in Section 6.4.2 to equilibrate for at l
29、east 16 hours. Scribe a four-inch (100 mm) vertical line on the lower portion of the panel one inch (25 mm) from the bottom edge. The conditions of making the scribe shall be as described in ASTM D 1654. Expose panels in the salt fog cabinet according to ASTM B 117. Panels shall be examined for rust
30、ing and blistering at 96-hour intervals for a period of 500 hours. The rusting shall not exceed 8 according to SSPC-VIS 2 or ASTM D 610, and blistering shall not exceed 8F according to ASTM D 714. Undercutting at the scribe, according to ASTM D 1654, shall not exceed 1/8 inch (3.2 mm) from the cente
31、r of the scribe.6.5 TEST FENCE AND LABORATORY EVALUATION:6.5.1 Apply the painting system to four panels and allow to dry for two weeks, in accordance with Section 6.1.6.5.2 Expose panels for a minimum of 12 months on a test fence at an industrial or marine site having a minimum annual mean precipita
32、tion of 25 inches (635 mm) per year (See Note 11.12). Other criteria for classifying the environment, such as corrosion rate of bare steel or bare zinc (in accordance with ASTM G 92), or mean annual temperature may also be required by the purchaser (See Note 11.13).6.5.3 The rusting shall not exceed
33、 9 as indicated by SSPC-VIS 2 or ASTM D 610, and there shall be no blistering as judged by ASTM D 714.6.5.4 The panels shall then be subjected to the Thermal Shock Test (and rated as described in Section 6.4.2) followed by the Salt Fog Test (and prepared and rated as described in Section 6.4.3).6.6
34、LONG-TERM EXTERIOR EXPOSURE: Test panels coated as described in Section 6.4.1 shall be exposed for a minimum of 36 months as described in Section 6.5 and exam-ined for rusting and blistering. The rusting shall not exceed 9 as judged by SSPC-VIS 2 or ASTM D 610. There shall be no blistering (See Note
35、 11.13).7. Material Quality Assurance7.1 The supplier shall certify that the products furnished are essentially identical formulations to those used in qualifi cation testing.7.2 The paint shall meet the requirements of Sections 7.3 through 7.8.7.3 Each component as received shall show no evidence o
36、f livering, skinning, or hard settling of the pigment. The inside of the container shall not be corroded. The material shall be easily dispersed in the liquid portion by hand stirring to form a smooth, homogeneous paint.7.4 The viscosity of the mixed primer shall be determined in accordance with AST
37、M D 562. Variance shall be within 5 Krebs Units or equivalent units of another viscometer of the viscosity of the previously qualifi ed primer.7.5 Density of the mixed paint shall be determined in accordance with ASTM D 1475. Variance shall be within 0.4 pounds/gallon (50 g/l) of the density of the
38、previously qualifi ed paint.7.6 Solids percent by weight of the mixed paint shall be determined in accordance with ASTM D 2369. Variance shall be within 2% of the percent solids by weight of the previously qualifi ed paint.7.7 The paint manufacturer and the purchaser shall agree on an acceptable she
39、lf life for the painting system.7.8 Other tests may be used to determine the acceptability of a lot or batch of a qualifi ed product at the discretion of the purchaser.8. Labeling8.1 Refer to ANSI Z129.1. Other guidelines can be found in the National Paint and Coating Association (NPCA) “Paint Indus
40、try Labeling Guide.“8.2 MARKING OF CONTAINER: Each container shall be legibly marked with the following information:Name: Latex Painting System (Primer or Topcoat) Specifi cation: SSPC Painting System PS 24.00Color:5-148SSPC-PS 24.00August 1, 1991Editorial Revisions November 1, 2004Lot Number:Batch
41、Number: Stock Number: Date of Manufacture:Quantity of Paint in Container:Information and Warnings as may be required by Federal and State Laws:Manufacturers Name and Address:8.3 DIRECTIONS FOR USE: The manufacturer shall supply complete instructions covering uses, surface prepara-tion, mixing, thinn
42、ing, volume solids, application methods, application conditions, pot life, wet and dry fi lm thicknesses, temperature and humidity limitations, drying times, etc., with each container of paint.9. Inspection9.1 All materials (coatings) supplied under this specifi cation are subject to timely inspecti
43、on by the purchaser or his autho-rized representative. The purchaser shall have the right to reject any materials supplied which are found to be defective under this specifi cation (See Note 11.14.). In case of dispute, unless otherwise specifi ed, the arbitration or settlement procedure established
44、 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. 9.2 Samples of paints may be requested by the purchaser and shall be supplied upon request alo
45、ng with the manufac-turers name and identifi cation 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.9.3 Unless otherwise specifi ed, the sampling shall be in accordance with ASTM D 3925.10. Disclaimer10.1 W
46、hile 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 resulting from the use of any materials, coatings, or methods specifi ed herein,
47、or of the specifi cation or standard itself.10.2 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 practices described herein, is responsible for instituting appropriate health
48、and safety practices and for insuring compliance with all governmental regulations.11. NotesNotes are not requirements of this specifi cation.11.1 The system may also be applied over sound painted surfaces in multiple coats of lower dry fi lm thickness (three mils 76 micrometers minimum total thickn
49、ess).11.2 VOC information may be provided on the container label or the technical data sheet.11.3 ASTM D 3960 and EPA Method 24 are the most commonly used methods to determine VOC content.11.4 This specifi cation describes a painting system designed to achieve long-term protection of the substrate. A detailed documentation of successful case histories of actual fi eld performance may be used as an alternative to the specifi ed testing regimen if agreed upon by the contracting parties. The paint supplier should furnish evidence of satisfactory lo
