Chlorinated Rubber Inhibitive Primer

Chlorinated Rubber Inhibitive Primer Guideline

PAINT SPECIFICATION NO. 17 – Chlorinated Rubber Inhibitive Primer

1. Scope
1.1 This specification covers a fast drying chlorinated rubber inhibitive primer for use on steel surfaces or exterior non-submerged surfaces, as well as most submerged surfaces prior to being over-coated with additional chlorinated rubber coatings. When applied as a shop coat to steel expected to be exposed to normal weathering or mild chemical environments for more than 60 days, it is recommended that either an ad­ditional coat of primer be applied or that the next succeeding coat be applied in the shop. This coating is not recommended for areas exposed to strong organic solvents, oxidizing acids, or to areas where the surface temperature exceeds 165°F (74°C). Straight chain unsaturated acids, and fats and oils of animal or vegetable origin will cause softening and swelling of the coating.

1.2 This inhibitive primer, when applied over properly prepared steel surfaces and coated with SSPC-Paint 18, “Chlorinated Rubber Intermediate Coat Paint,” and followed by at least one (optional) finish coat of SSPC-Paint 19, “Chlorinated Rubber Topcoat Paint,” is suitable for exposures in Environmental Zones 1A (interior, normally dry), 1B (exterior, normally dry), 2A (frequently wet by fresh water), 2B (frequently wet by salt water), 2C (fresh water immersion), 2D (salt water immersion), 3A (chemical, acid), 3B (chemical, neutral), and 3C (chemical, alkaline).

1.3 Steel surfaces shall be blast cleaned in accordance with SSPC-SP 6, “Commercial Blast Cleaning,” for atmospheric use or with SSPC-SP 10, “Near-White Blast Cleaning,” for im­mersion or heavy chemical use. Steel may also be prepared according to SSPC-SP 8, “Pickling.”

1.4 This inhibitive primer is intended for application by brush, roller, or spray and is to be applied in accordance with SSPC-PA 1, “Shop, Field, and Maintenance Painting of Steel.”

1.5 If this coating is applied over alkyd- or oil-base enamels, there is the possibility of lifting, particularly on interior surfaces. A spot check is necessary to determine suitability. If lifting oc­curs, then a seal-coat, as recommended by the manufacturer, may be required. For immersion service, this coating should not be applied over alkyd or oil-base enamels.

2. Description
2.1 This primer is a mixture of inhibitive pigments, extender pigments, chlorinated rubber, chlorinated resins, plasticizers, and solvents. Details of the composition are given in Table 1.

2.2 This primer contains a minimum of 32% by volume of nonvolatile film-forming solids (pigment and binder). The minimum theoretical spreading rate for a 1.5 mil (38 microm­eters) dry film thickness is 340 square feet/U.S. gallon (8.4 square meters/liter). Actual spreading rates can be significantly lower.

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.
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.

3.4 SSPC STANDARDS AND JOINT STANDARDS:

3.5 ASTM INTERNATIONAL STANDARDS:
B 117 Practice for Operating Salt Spray (Fog) Apparatus
D 13 Specification for Spirits of Turpentine
D 185 Test Methods for Coarse Particles in Pigments, Pastes, and Paints
D 445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and the Calculation of Dynamic Viscosity)
D 562 Test Method for Consistency of Paints Measuring Krebs Units (KU) Viscosity Using a Stormer-type Viscometer
D 602 Specification for Barium Sulfate Pigments
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
D 1296 Test Method for Odor of Volatile Solvents and Diluents
D 1475 Test Method for Density of Liquid Coatings, Inks, and Related Products
D 1542 (Withdrawn)Test Method for Qualitative Detection of Rosin in Varnishes
D 3278 Test Methods for Flash Point of Liquids by Small-Scale Closed-Cup Apparatus
D 3728 Specification for 2-Ethoxyethyl Acetate (99% Grade)
D 3925 Practice for Sampling Liquid Paints and Related Pigmented Coatings

3.6 FEDERAL STANDARDS:
MIL-C-429D Chlorinated Paraffin, Technical
FED-STD-141 Paint, Varnish, Lacquer and Related Materi­als: Methods of Inspection, Sampling and Testing
Method 2011 (canceled) Preparation of Steel Panels
Method 3011 Condition in Container]
Method 4021 (canceled) Pigment Content (Ordinary Centrifuge)
Method 4053 Nonvolatile Vehicle Content
Method 4061 Drying Time
Method 4203 Reducibility and Dilution Stability
Method 4321 Brushing Properties
Method 4331 Spraying Properties
Method 4541 (canceled)Working Properties and Appearance of Dried Film
Method 6221 (canceled) Flexibility

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

4. Composition
4.1 Ingredients and proportions shall be as specified in Table 1.
4.2 The inhibitive 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 2.

5. Properties
5.1 The paint shall meet the requirements of Table 3 and Sections 5.2 through 5.6.
5.2 ODOR: Shall be normal for the materials permitted (ASTM D 1296).
5.3 COLOR: The color shall be consistent with the choice of inhibitive pigment and shall be obtained by using compatible, chemically resistant tinting pigments.
5.4 COMPATIBILITY: There shall be no evidence of incompatibility of any of the ingredients of the paint when one volume of the paint is slowly mixed with one volume of xylene (FED-STD-41, Method 4203).
Solvent blends shall be checked in an unpigmented film deposited on glass. The dried film must be clear and bright. The flexibility and permeability of the trial film shall also be compared with that obtained from the “control formulation” paint.
5.5 WORKING PROPERTIES: The paint shall be easily applied by all three methods when tested in accordance with FED-STD-141, Methods 4321, 4331, and 4541. The paint shall show no streaking, running, or sagging after 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 12 months from date of delivery, in a full, tightly covered container, at a temperature of 50-110°F (10-43°C).

5.7 When subjected to the tests described in Sections 5.8 through 5.12, the performance of the paint shall be equal to or better than the “control formulation” paint given in Table 4.
5.8 FILM THICKNESS: The primer shall be capable of being applied to produce a dry film thickness of 1.5 mils (38 micrometers) minimum without running or sagging. Depend­ing upon the volume solids content, this will require a wet film thickness of approximately 5 mils (127 micrometers). Panels prepared for the working properties test under Section 5.5 may be used for these measurements. A minimum of five measurements shall be taken to calculate the average dry film thickness.
5.9 SALT FOG TEST: This test shall be performed in ac­cordance with ASTM B 117. Panels shall be 3″ x 6″ x 1/8″ (8 cm x 16 cm x 0.3 cm) cold-rolled steel, sandblasted in accordance with SSPC-SP 10, “Near-White Blast Cleaning,” using 20-40 mesh silica sand. The primer shall be applied by spray to a 3.0 mil (76 micrometers) dry film thickness—approximately 9 mils (229 micrometers) wet film. After one week of drying at 70-80°F (21-27°C), the panels shall be scored as indicated in ASTM B 117. Panels shall be exposed in the cabinet at a 30 degree angle from the vertical. Panels shall be tested in duplicate and examined at 96-hour intervals for a period of 500 hours.
5.10 FLEXIBILITY TEST: This test shall be run in ac­cordance with FED-STD-141, Method 6221. Panels shall be 3″ x 6″ (8 cm x 16 cm) 20 gage cold-rolled steel, cleaned in accordance with FED-STD-141, Method 2011, Procedure D, followed by Procedure A.

The primer shall be applied by spray to a 3.0 mil (76 micrometers) dry film thickness—approximately 9 mils (229 micrometers) wet film. After one week of drying at 70-80°F (21-27°C), the panel shall be bent over a 1-1/2 inch (4 cm) mandrel and shall show no cracking or loss of adhesion.

5.11 EXTERIOR EXPOSURE: Since exposure environ­ments vary, exposure tests must be based on comparison with the “control formulation” paint. The proposed paint shall provide at least as much protection as the “control formulation” paint. Panels shall be 6 inch (16 cm) channel steel in a 12″ (30 cm) long section and exposed at a 45 degree angle south exposure with the flanges horizontal. Each panel shall have a weld bead approximately 3 inch (8 cm) long placed at the left end of the panel about 3 inch (8 cm) from the end. The primer shall be applied by spray to a 3.0 mil (76 micrometers) dry film thickness—approximately 9 mils (230 micrometers) wet film. After one week of drying at 70- 80°F (21-27°C), the coated steel shall be scored in an “X” pattern on the right 3 inch (8 cm) from the end. Each stroke of the “X” must be 4 inch(10 cm) long. Then the panels shall be placed on exposure. After 60 days exposure, both the proposed and “control” paints shall show no blistering or rusting on the face and only minor blistering or rusting at the weld and score.

5.12 FRESH WATER IMMERSION TEST: Panels shall be 3 inch x 6 inch x 1/8 inch (8 cm x 16 cm x 0.3 cm) cold-rolled steel prepared according to SSPC-SP 10, “Near-White Blast Cleaning,” using 20-40 mesh silica sand. The primer shall be applied by spray to a 3.0 mil (76 micrometers) dry film thick­ness—approximately 9 mils (229 micrometers) wet film. Half of the immersed area and half of the unimmersed area shall be coated with the selected topcoat system. After one week of drying at 70-80°F (21-27°C), the panels shall be partially im­mersed (halfway) in distilled water at 100°F (38°C). Panels shall be examined every 24 hours for blistering, leaching, rusting, or loss of adhesion. Both the proposed and “control” paints shall pass 500 hours immersion with no other defect than a slight discoloration (examine after a one-hour drying period).

6. Labeling
6.1 Refer to ANSI Z129.1, “Hazardous Industrial Chemi­cals—Precautionary Labeling.”
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: Chlorinated Rubber Inhibitive Primer
Specification: SSPC-Paint 17
Color:
Lot Number:
Stock Number:
Date of Manufacture:
Quantity of Paint in Container:
Information and Warnings as may be required by
Federal and State Laws:
Manufacturer’s Name and Address:

This paint is intended for use as a primer on structural steel. Before applying remove all moisture, oil, grease, dirt, and loose or nonadhering paint. Rust, rust scale, mill scale, etc., shall be removed by abrasive blast cleaning in accordance with SSPC-SP 6, “Commercial Blast Cleaning,” or SSPC-SP 8, “Pickling.” Sound old coatings that are compatible with this chlorinated rubber paint may remain, but damaged areas or areas with poor adhesion must be spot-cleaned before prim­ing. When the coating system is intended for immersion, the surface shall be cleaned in accordance with SSPC-SP 10, “Near-White Blast Cleaning,” or SSPC-SP 8, “Pickling.”

This primer is intended to be followed by an intermedi­ate paint conforming to SSPC-Paint 18, “Chlorinated Rubber Intermediate Coat Paint,” and/or a finish coat conforming to SSPC-Paint 19, “Chlorinated Rubber Topcoat Paint.” The entire system is designed to provide maximum chemical resistance. In more severe environments, a second prime coat is recom­mended.

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

Directions for Use of Chlorinated Rubber Inhibitive Primer

Mix paint thoroughly before use. If simple stirring is in­adequate, pour off most of the liquid into a clean container. 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 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.

Generally thinners are not used for brush application. For spray application, the coating may be thinned with xylene up to 1-1/2 pints per gallon (190 ml/L) of unthinned paint. A by volume blend of 80% minimum of xylene and 20% maximum of an aliphatic solvent having an evaporation rate faster than that of xylene may be used instead of straight xylene.

Apply by brush or spray to the specified film thickness or, if none is specified, to at least 1.5 mils (38 micrometers) dry or approximately 5 mils (127 micrometers) wet. When application is by spraying, the equipment and operator technique should be properly adjusted to prevent dry spray and to deposit a wet film of paint on the substrate. Clean the equipment with xylene or the reducing thinner both before and after use.

The surface to be painted shall be dry and the surface temperature shall be at least 5°F (3°C) above the dew point. When no ice or frost is present on the substrate, this coating may be applied at temperatures as low as 5°F (-15°C). Do not paint outdoors if precipitation, dew, or condensation is expected before the paint dries.

At temperatures of 50-80°F (15-27°C) and relative hu­midities of 40% to 60%, allow at least three hours drying time between coats. Allow at least 48 hours of drying time after the last coat is applied before placing in water immersion service. If the temperature is below 60°F (16°C) or if the relative humidity is above 60°F (16°C) or if the relative humidity is above 60%, allow 4 to 7 days before placing in water immersion service.

7. Inspection
7.1 All materials (paints and 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 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 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 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 requirements of this specification.
9.1 The procurement documents should establish the responsibility for samples, testing, and any required affidavit certifying full compliance with the specification.
9.2 ASTM and Federal Standard Test Methods listed as “canceled” or “withdrawn” are no longer maintained, but still available as historical documents.

PAINT SPECIFICATION NO. 17 – Chlorinated Rubber Inhibitive Primer