PRUETT-SCHAFFER

www.pruett-schaffer.com

PRODUCT NUMBER

PRODUCT NAME

26-5

RED OXIDE WELDABLE WATER-BASED PRIMER

 GENERAL DESCRIPTION

Pruett-Schaffer’s #26-5 Red Oxide is an air drying, water reducible epoxy ester rust inhibiting primer. It is designed as a pre-construction primer for metal substrates where welding will take place following priming. It has a burn-back under normal conditions of 1/8 inch. It should not affect weld strength when properly applied and does not release any toxic heavy metals when burned.

RECOMMENDED USES

This product is recommended for use in corrosive environments. It has outstanding wetting properties and excellent adhesion to a wide variety of substrates including minimally prepared cold rolled steel, castings, forgings, aluminum, and existing coatings. Not recommended for immersion service or for areas subject to constant temperatures in excess of 300 0F. The paint is not flammable and has very low toxicity.

SURFACE PREPARATION

For best results substrates should be blasted to SSPC-SP-6 minimum, with a 1 mil blast profile. Feather all rough or sharp edges. This coating is very tolerant of less than perfect surface preparation however, so chemical cleaning, water blasting, or even hand or power tool cleaning may be sufficient, depending on the level of service required. At a minimum for acceptable performance, all surfaces to be coated must be clean, dry and free of oil/grease, loose rust/paint, weld spatter, burning slag, dust, and chalk.

THINNING

Under normal conditions no thinning is necessary or desirable.

Thin if necessary for proper spraying with an 80/20 mixture of water/butyl cellosolve (Pruett-Schaffer thinner #98-8937). Add thinner a little at a time with constant gentle agitation to a maximum of 5% by volume.

APPLICATION EQUIPMENT

This paint may be applied by brush, roller, dip tank application, air-assisted or airless spray. Brushes should be of polyester or nylon construction. Use roller covers with 3/8 to 1/4 inch nap. Use spray tips of 0.015-.020 inch. Apply 1-2 mil dry film thickness (excessive dry film thickness may interfere with weld strength) . When using dip tank application, contact Pruett-Schaffer for further information regarding pH and viscosity maintenance requirements of dip tank.

DRYING TIME

Dries tack free in 30-60 minutes at 77 0F and 50% Relative Humidity. Light handling may be possible in 90 minutes. High humidity will prolong dry time more so than low temperatures. To speed the dry time good air movement over the work and local exhaust is recommended. Heat lamps or forced warm air drying will reduce dry time in cold shops.

CLEANUP

Clean equipment with warm soap and water before the film dries. Run ethyl alcohol through spray guns after cleaning to prevent corrosion of steel parts.

ENVIRONMENTAL

This product meets current air pollution regulations regarding hydrocarbon and ozone reactive emissions. It contains no lead, chromate, or zinc.

PHYSICAL PARAMETERS

VOC, U.S. EPA Reference Method 24:

2.85 lb/gal

COATING DENSITY, ASTM D-1475:

10.73 lb/gal

COATING DENSITY, LESS WATER: 12.99 lb/gal

ORGANIC SOLVENT, % WEIGHT: 13.91

NONVOLATILE:

By weight: 52.7 +/- 2.0 %

By volume: 30.3 +/- 1.0%

THEORETICAL COVERAGE:

487 ft2/gallon/mil, dry film

INITIAL GLOSS, 600, ASTM D-523: 1-20

VISCOSITY, ASTM D-562:

65-75 Krebs Units

pH RANGE, ASTM D-4584:8.0-8.5

FLASH POINT, PENSKY-MARTINS CC:

>141 0F

TEST DATA

SALT SPRAY EXPOSURE, ASTM B-117 and D-1654, 5% SOLUTION:

160 hrs rust creepage from scribe: < 1 mm

IMPACT, ASTM D-2794:

Direct: > 60 in-lbs

Reverse: > 60 in-lbs

ELONGATION, ASTM D-522:

1/4 in conical mandrel: no cracking or flaking

 

THIS INFORMATION RESULTS FROM TESTS CONDUCTED IN A LABORATORY UNDER LABORATORY CONDITIONS. DIFFERENT RESULTS MAY BE OBTAINED IN COMMERCIAL USE OF THIS PRODUCT UNDER FACTORY OR FIELD CONDITIONS. PRUETT-SCHAFFER MAKES NO WARRANTY CONCERNING THE SUITABILITY OF THIS PRODUCT FOR THE END USE CONTEMPLATED BY THE BUYER, EXCEPT THAT THE PRODUCT SHALL BE IN COMPLIANCE WITH THE TECHNICAL SPECIFICATIONS PRESENTED HEREIN.

REVISED 09-19-2000 PRUETT-SCHAFFER, 3327 STAFFORD STREET, PITTSBURGH, PA 15204

PHONE: (412) 771-2000 FAX: (412) 771-2205