«OBEREG GF-021» is a ready to use anti-corrosion undercoat intended to protect metal surfaces, details and constructions from corrosion before applying various types of paint, varnishes and enamels. Ensures proper grip of painting materials with the processed surfaces. Provides additional protection from corrosion. Temperature-stable (from -45°С to +60°С).
PHYSICAL, CHEMICAL AND MAINTENANCE PROPERTIES
Property name
Normal value
1. Undercoat film color
Light gray, not standardized
2. Film texture
Upon drying, film should appear flat, homogenous, matte or semi-glossy
3. Conditional viscosity at (20,0±0,5) °Сaccording to viscometer ВЗ-4, seconds, no less than
45
4. Maximum undercoat dilution rate
20
5. Non-volatiles by weight, %
54-60
6. Dispersion, μm, no more than
40
7. Drying to grade 3, if conditions are met:
(105±5) °С, min
35
(20±2) °С, hrs
24
8. Film hardness according to М-3 pendulum tool, conventional units, no less than
0,35
9. Film elasticity when curved, mm, no more than
1
10. Impact strength on U-1 tool, cm, no less than
50
11. Film adhesion, points, no more than
1
12. Film durability when statically exposed to 3% sodium chloride solution, hours, no less than
24
13. Polishing possibilities
Upon polishing, film should form a plain surface without smearing the sandpaper
14. Resistance to nitric enamel effect
The nitric enamel film should not be distorted or cracked when applied over the undercoat
15. Film durability when statically exposed to mineral oil at (20±2) °С, hours, no less than
48
16. Delamination, ml, no more than
5
* Note. Easily stirred precipitation may form during storage. Increasing dilution rate is acceptable if upon dilution and proper stirring, the undercoat still fits the requirements described in current document.
SURFACE PREPARATION
Metal construction should be prepared for undercoat application in accordance with the requirements of GOST 9.402-80 “Metal surfaces preparation before painting”, grade 2.
If required, consider dedusting and degreasing the surface.
Any further application of varnishes, enamels and paints can be performed only upon undercoat drying to grade 3 (GOST 19007). In the event of flame-retardant paints application, drying to grade 5 is required (GOST 19007).
“OBEREG GF-021” ANTI-CORROSION UNDERCOAT
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