PRODUCT NUMBER

PRODUCT NAME

50-12520-2

BLACK VARNISH, B-440 in XYLOL

GENERAL DESCRIPTION

Pruett-Schaffer’s #50-12520-2 is a single component, fast air-drying, solvent based, ester gum/natural hydrocarbon resin based varnish. This compound is designed to meet Westinghouse Electric Corporation Specification B-440 (W.E. Code 32411AJ00V) for use in proprietary applications. This version contains xylol as a solvent, which provides a better dry rate and stability (low viscosity increase and separation).

RECOMMENDED USES

This product can be applied by brush, spray, or roller, and will dry in normal room temperatures in 30-60 minutes. It exhibits good surface wetting properties for ease of use over difficult to clean substrates. The coating has excellent heat and water resistance, but is not recommended for long term exposure to hydrocarbon solvents, oil, gasoline, or other fuels. The coating is not normally topcoated.

SURFACE PREPARATION

For best performance, new metal or ceramic substrates should be clean, dry, and free of oil or grease. Concrete should have all form release oils, curing membranes and dust removed. This

coating is very tolerant of less than perfect surface preparation, but all rough or sharp edges should be rounded or smoothed before application.

THINNING

Under normal conditions no thinning is necessary. Thin if necessary for spraying with xylol, toluol, mineral spirits, or aromatic naphtha. Add a little at a time with constant gentle agitation to a maximum of 5% by volume. In ambient temperatures over 85 ^F use Aromatic 100 or Aromatic 150 to minimize “dry spraying”.

APPLICATION EQUIPMENT

May be applied by roller, brush, air-assisted spray, or airless spray. Airless spray gives the best results, use .015-. 020 inch tip size. Brushes should be of polyester or nylon construction. If applying with a cup type spray gun, thinning may improve application properties. Apply as per spec. A 9-12 mil wet film thickness will yield a 3-4 mil dry film thickness.

DRYING TIME

Dries tack free in 30-60 minutes at 70 ^F when applied at a wet film thickness of 6-8 mils.

CLEANUP

Clean equipment with xylol or toluol before the film dries.

ENVIRONMENTAL

This product contains no lead, chromate, or zinc.

PHYSICAL PARAMETERS

VOC, ASTM D-3960: 3.70 lb./gal

WEIGHT PER GALLON, ASTM D-1475:

7.67 lbs.

NONVOLATILE:

By weight: 51.7 minimum

By volume: 42.2 ± 1.0%

THEORETICAL COVERAGE:

677 ft²/gallon/mil, dry film

VISCOSITY, ASTM D4212-93:

30-40 seconds #2 Zahn Cup

FLASH POINT, TAG CC: 80 ^F

TEST DATA

ANTISAG INDEX, ASTM D-4400: >13 mils

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.