Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Blast Cleaned Steel Type I and Type II

Zinc Oxide, Alkyd, Linseed Oil Primers for Blast Cleaned Steel

PAINT SPECIFICATION NO. 25 BCS – Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Blast Cleaned Steel Type I and Type II

1. Scope
1.1 This specification covers a French process zinc oxide, raw linseed oil and alkyd primer suitable for use over blast cleaned steel.

1.2 This is an alkyd/linseed oil primer containing 30% more alkyd resin than SSPC Paint 25. It is not recommended for hand cleaned steel.

1.3 This primer is suitable for exposures in Environmental Zones 1A (interior, normally dry) and 1B (exterior, normally dry), and is intended for brush, roller, or spray application over steel surfaces prepared in accordance with SSPC-SP 6/NACE No. 3, “Commercial Blast Cleaning,” or SSPC-SP 11, “Power Tool Cleaning to Bare Metal,” or better.  (See Note 9.6.) It is suitable as a shop primer, field primer, maintenance primer, or intermediate coat and is to be applied in accordance with SSPC-PA 1, “Shop, Field, and Maintenance Painting of Steel.” If the primed part of the structure is to be exposed to the weather, it should be topcoated as soon as practical.

2. Description
2.1 This specification contains requirements to ensure performance that is comparable to that customarily expected from paints containing lead and chromate pigments. It has fair wetting ability, about 18 hours drying time and good resistance to weathering before field coating.  The wetting ability of this primer is the result of one third of the binder being raw linseed oil. Type II has a lower percentage of volatile organic compounds (VOC) than Type I. The reduced VOC content of Type II was achieved by replacing some of the mineral spirits with high flash naphtha and by making other minor composition changes. Details of the compositions are given in Table 1 for Type I and in Table 2 for Type II.

2.2 The Type I primer contains approximately 65% by volume of nonvolatile film forming solids (pigment and binder). The theoretical spreading rate for a 50 micrometer (2.0 mil) dry film thickness is 12.8 m2/L (520 ft2/U.S. Gallon). Actual spreading rates can be significantly lower. On a calculated basis, the VOC content is 270 grams per liter (2.3 lb/gal).

2.3 The Type II primer contains approximately 72% by volume of nonvolatile film forming solids (pigment and binder). The theoretical spreading rate for a 50 micrometer (2.0 mil) dry film thickness is 14.2 m2/L (580 ft2/U.S. gallon). Actual spreading rates can be significantly lower. On a calculated basis, the VOC content is 220 g/L (1.9 lb/gal).

3. Referenced Standards
3.1 The latest issue, revision, or amendment of the refer­enced standards in effect on the date of invitation to bid shall govern, unless otherwise specified. Standards marked with an asterisk (*) are referenced only in the Notes, which are not requirements of this specification.

3.2 If there is a conflict between the requirements of any of the cited referenced standards and this specification, the requirements of this specification shall prevail.

3.3 SSPC STANDARDS AND JOINT STANDARDS:

3.4 ASTM INTERNATIONAL STANDARDS:
D 79 Specification for Zinc Oxide Pigments
D 185 Test Method for Coarse Particles in Pigments, Pastes and Paints
D 234 Specification for Raw Linseed Oil
D 235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
D 562 Test Method for Consistency of Paints (Measuring Krebs Unit Viscosity) Using a Stormer-type Viscometer
D 600 Specification for Liquid Paint Driers
D 605 Specification for Magnesium Silicate Pigment (Talc)
D 607 Specification for Wet Ground Mica Pigments
D 1208 Test Methods for Common Properties of Certain Pigments
D 1210 Test Methods for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-type Gage
D 1296 Test Method for Odors of Volatile Solvents and Diluents
D 1475 Test Method for Density of Liquid Coatings, Inks, and Related Products
D 1542 (Withdrawn)Test Method for Quantitative Test for Rosin in Varnishes
D 1640 Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room Temperature
D 2369 Test Method for Volatile Content of Coatings
D 2371 Test Method for Pigment Content of Solvent-Reducible Paints
D 2448 Test Method for Water-Soluble Salts in Pig­ments by Measuring the Specific Resistance of the Leachate of the Pigment
D 2832 Standard Guide for Determining Volatile and Nonvolatile Content of Paint and Related Coatings
D 3278 Test Methods for Flash Point of Liquids by Small-Scale Closed-Cup Apparatus
D 3722 Specification for Natural Red and Brown Iron Oxide Pigments
D 3724 Specification for Synthetic Brown Iron Oxide Pigment
D 3734 Specification for High-Flash Aromatic Naphthas
D 3925 Practice for Sampling Liquid Paints and Related Pigmented Coatings
D 3951 Practice for Commercial Packaging
D 4400 Test Method for Sag Resistance of Paints Using a Multinotch Applicator

3.5 FEDERAL SPECIFICATIONS AND STANDARDS:
TT-R-266 Resin, Alkyd: Solutions
FED-STD-141: Paint, Varnish, Lacquer and Related Materials: Methods of Inspection, Sampling and Testing
Method 3011 Condition in Container
Method 3021.1 (Canceled) Skinning (Partially Filled Container)
Method 4203 Reducibility and Dilution Stability
Method 4321 Brushing Properties
Method 4331 Spraying Properties
Method 4541 (Canceled) Working Properties and Appearance of Dried Film

3.6 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) STANDARD:
ANSI Z129.1 Hazardous Industrial Chemicals – Precautionary Labeling

4. Composition
4.1 Ingredients and proportions shall be as specified in Table 1 for Type I and in Table 2 for Type II.
4.2 The primer based on the specified ingredients shall be uniform, stable in storage, and free from grit and coarse particles. No rosin or rosin derivatives may be used. Beneficial additives such as anti-skinning agents, suspending agents, or wetting aids may be added.
4.3 The paint shall conform to the composition (analysis) requirements of Table 3.

5. Properties
5.1 The primers for Type I and Type II shall meet the requirements of Tables 3 and  4 and of Sections 5.2 through 5.8.
5.2 ODOR: The odor shall be normal for the materials permitted (ASTM D 1296).
5.3 COLOR: The color shall be typical of the specified mixture of zinc oxide and red or brown iron oxide.
5.4 COMPATIBILITY: There shall be no evidence of incompatibility of any of the ingredients of the paint when two volumes of the paint are slowly mixed with one volume of mineral spirits (FED-STD-141, Method 4203).
5.5 WORKING PROPERTIES: The paint shall be easily 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 or while drying.
5.6 CONDITION IN CONTAINER: The paint shall show no thickening, curdling, gelling, or hard caking when tested as specified 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 10-43°C (50-110°F).
5.7 SKINNING: There shall be no skinning in a three-quarters filled closed container after 48 hours when tested in the standard manner specified in FED-STD-141, Method 3021.
5.8 SALT CONTAMINATION: Content of salt contamina­tion shall have been minimized by the incorporation of only high purity materials. The specific resistance of the aqueous leachate of the composite of the pigments in required propor­tions shall be a minimum of 5,000 ohm-cm when tested in accordance with ASTM D 2448.

6. Labeling
6.1 Labeling shall conform to ANSI Z129.1.
6.2 Technical data shall be provided for at least all data elements categorized as “essential” in SSPC-Guide 13.
6.3 MARKING OF CONTAINERS: Each container shall be legibly marked with the following information:
Name: Zinc Oxide, Alkyd, Linseed Oil Primer for Use  Over Blast Cleaned Steel, Type I (or Type II)
Specification: SSPC-Paint 25 BCS
Color: Red or Brown Iron Oxide
Lot Number:
Batch Number:
Stock Number:
Date of Manufacture:
Quantity of Paint in Container:
Information and Warnings as may be required by
Federal and State Laws:
VOC Content:
Manufacturer’s Name and Address:
6.4 PACKAGING: Material shall be packaged and labeled in accordance with the requirements of ASTM D 3951 unless otherwise specified.

6.5 DIRECTIONS FOR USE: The following directions for use shall be supplied with each container of paint:

Directions for Use of Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Blast Cleaned Steel

This paint is intended for use as a primer over steel surfaces (blast cleaned steel) cleaned at least to SSPC-SP 6, “Commercial Blast Cleaning,” or to SSPC-SP 11, “Power Tool Cleaning to Bare Metal” in atmospheric exposure. The surfaces shall be free of all visible oil, grease, dirt, dust, mill scale, rust and paint.

Mix paint thoroughly before use. If the pigment has set­tled, pour off most of the liquid. Thoroughly mix the pigment with the remaining liquid, taking care to scrape all the pigment off the bottom of the can. Gradually add the poured-off liquid and mix thoroughly. Mixing may be made easier by transfer­ring the contents to a larger container or by pouring the paint to and from another container. Examine bottom of container for unmixed pigment. Screen paint before applying.

The thinning of paint may change the VOC class. For roller, brush, or airless spray application, no thinning should be necessary. A minimum amount of thinning may be necessary for conventional air spray.

Apply by brush or spray to the specified film thickness or, if none is specified, to at least 50 micrometers (2 mils) dry. The surface to be painted shall be dry; the surface temperature shall be at least 3 C° (5 F°) above the dew point and the temperature of the air shall be over 4°C (40°F). Do not paint outdoors in rainy weather or if freezing temperatures are expected before the paint dries.

Allow paint at least 18 hours drying time before recoating.

7. Inspection
7.1 All materials (coatings) supplied under this specifica­tion 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 specification. (See Note 9.1.) In case of dispute, un­less otherwise specified, the arbitration 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 the purchaser and material supplier shall be used.
7.2 Samples of paints may be requested by the purchaser and shall be supplied upon request along with the manufac­turer’s name and identification 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.
7.3 Unless otherwise specified, the sampling shall be in accordance with ASTM D 3925.

8. Disclaimer
8.1 While every precaution is taken to ensure that all information furnished in SSPC standards and specifications 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 specified therein, 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 practices described herein, is responsible for instituting appropriate health and safety practices and for ensuring compliance with all governmental regulations.

9. Notes
Notes are not a requirement of this specification.
9.1 The procurement documents should establish the responsibility for samples, testing, and any required affi davit certifying full compliance with the specification.
9.2 The extraction of chlorides and other anions from corrosion pits in severe corrosivity areas of the structure is recommended.
9.3 The pre-blended composite pigment can be obtained from Hoover Color Corporation, P. O. Box 218, Hiwasse, VA 24347; Phone (703) 980-7233.
9.4 During the development of SSPC-Paint 25, the purity of each pigment was measured in accordance with ASTM D 2448. The specific resistances of the leachate for the individual pigments were as follows:

French process zinc oxide ………..20,000 ohm-cm Iron oxide …………………………………5,000 ohm-cm

Magnesium silicate …………………….2,800 ohm-cm Mica ……………………………………….17,000 ohm-cm

The calculated resistance for the formula blend using these purities for the individual paints is 5000 ohm-cm.

9.5 Handle wastes in accordance with federal, state and local government regulations. See SSPC-Guide 7, “Guide for the Disposal of Lead-Contaminated Surface Preparation Debris.”
9.6 The degrees of surface preparation SSPC-SP 5/NACE No. 1 and SSPC-SP 10/NACE No. 2 are better than SSPC-SP 6/NACE No. 3 and SSPC-SP 11.

PAINT SPECIFICATION NO. 25 BCS – Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Blast Cleaned Steel Type I and Type II