Paint Specifications

Specifications

Materials

R & M Steel Co. panels are pre-formed from steel conforming to ASTM A-792 Grade 80 or higher for GALVALUME™ or ASTM A-653 for Galvanized G-90. The GALVALUME™ sheet coating consists of an alloy of nominally 55% aluminum, 1.6% silicon, and the balance zinc by weight.

General

Substrates: G-90 Hot-Dipped Galvanized, Galvalume, Galfan, and Aluminum. Application: Roll-coating of two-coat system. System: Dura Coat's recommended Proprietary Solvent or Waterborne Primer and CERANAMEL-XT-40S™ topcoat, over properly cleaned and pre-treated substrate.

Surface Appearance

Smooth and free of streaks, blistering and other imperfections.

Film Thickness

Topside finish: Primer (dry) = 0.20 – 0.30 mil; Top-coat (dry) = 0.70 – 0.80 mil. Reverse side finish: Primer (dry) = 0.15 – 0.25 mil; Pigmented Polyester Backer (dry) = 0.30 – 0.40 mil. Total DFT for system = 0.90 – 1.10 mils. All measurements per NCCA Technical Bulletin II – 4 or ASTM D 1005-84 (1990).

Topside Color

Controlled to the Master Standard by an approved Color Difference Meter or Spectrophotometer, and by visual match under daylight and horizon light of a Macbeth Daylight Booth per ASTM D 1729-89.

Specular Gloss

Determined per ASTM D 523-89 at a glossmeter angle of 60°. CERANAMEL-XT-40S™ standard gloss range is 25% – 40% but can be made available in both higher and lower gloss ranges upon special request.

Hardness

Minimum pencil hardness, using Eagle Turquoise Pencils per NCCA Technical Bulletin II – 12 or ASTM D 3363-92a is “F.”

Cure Test

Cured in baking oven to withstand 100 double rubs of an MEK-soaked cloth, to expose primer.

Cross-Hatch Adhesion

No paint removal with Scotch #610 cellophane tape after cross-scoring with eleven horizontal and eleven vertical lines 1/8″ apart, per NCCA Bulletin II – 5 or ASTM D 3359-93.

Direct and Reverse Impact

No visible paint removal with Scotch #610 cellophane tape after direct and reverse impact of 80-inch pounds, using 5/8″ steel ball on a Gardner Impact Tester. (Not to include Zinc coating failures.) Per NCCA Bulletin II – 6 or ASTM D 2794-93.

Bend Adhesion

Per ASTM D 4145-83 (1990), no loss of adhesion when taped with Scotch #610 cellophane tape when subjected to a 2T diameter 180° bend test on 0.017″ G-90 (grade D) galvanized steel or fabricator’s roll-forming operation. (Not to include Zinc failures.) A forming operation using a “Butler Jig” may be substituted for this test to more closely simulate the roll-forming operation. Per ASTM D 522-93, an 1/8″ mandrel bend may also be used to evaluate flexibility, with the same results in flexibility and adhesion.

Humidity Resistance

No blistering, cracking, peeling, loss of gloss or softening of the finish after 1200 hours of exposure to 100% humidity at 100°F ±5°F, per Federal Test Method Standard 141, Method 6201 or ASTM D 2247-92.

Cleveland Condensing Cabinet

No blistering or white rust after 240 hours at 140°F with a 15-minute dry off period every 6 hours, per ASTM D 4585-86 (1991) and NCCA Bulletin III-6.

Water Immersion Resistance

Samples immersed in distilled water at 100°F per ASTM D 870-92: 1000 hours – no loss of gloss, color change, cracking, and no blistering greater than medium #6 over 20% of test area, per ASTM D 714-87. Slight softening of finish when first removed from immersion; original hardness will be regained after 24 hours at room temperature.

Salt Spray Resistance

Samples diagonally scored and subjected to 5% neutral salt spray per ASTM B 117-90, then taped with Scotch #610 cellophane tape: 1000 hours – no blistering, and no loss of adhesion greater than 1/8″ from score line. Samples taped 1 hour after removal from test cabinet.

Chemical Resistance

No significant color change after 24 hours exposure to 10% solutions of hydrochloric and sulfuric acids, per ASTM D 1308-87 (1993), Procedure 6.2 (spot test).

Kesternich Test

No significant color change after 10 cycles in an SO₂ chamber (Kesternich Cabinet or equivalent), per ASTM G-87-84 (1990).

Weatherometer Test

No checking, blistering or adhesion loss of coating system after 2000 hours of accelerated weathering, per ASTM D 822-89/G-23-93, Method II.

Color Change

Finish coat color change not to exceed 5 NBS units per ASTM D 2244-93 test procedure, after 2000-hour weatherometer test.

Chalking Resistance

No chalking greater than #8 rating per ASTM D 4214-89, Method D test procedure after a 2000-hour weatherometer test.

Exterior Weathering

Florida exposure (45° South) and EMMAQUA testing, per ASTM D 4141-93, Procedure C, both confirm superior exposure characteristics of CERANAMEL-XT-40S™ systems.

Abrasion Resistance

Per ASTM D 968-93, Method A, CERANAMEL-XT-40S™ will pass 30 liters/mil, minimum, of falling sand.

Flame Spread Rate

CERANAMEL-XT-40S™ displays a flame spread classification of A (Class 1), when tested in accordance with ASTM E 84-91.

Chip Resistance

Rating of at least 5B, per ASTM D 3170-87 (1991).

Filiform Corrosion Resistance

CERANAMEL-XT-40S™ will not sustain filiform corrosion, per ASTM D 2803-93.