HG/T 2239-1991

1. Appearance of the paint film–Flat

2. Viscosity (TU-4# cup) (s) (≥)–50

3. Fineness (μm ) (≤)–Zinc yellow epoxy ester primer: 50; iron red epoxy ester primer and other epoxy ester primers: 60

4. Drying schedule (120±2℃/1h) (h) (≤)–Touch dry: 1; hard dry: 24

5. Adhesion (level) (≤)–2

6. Hardness (double-pendulum instrument) (≥)–0.25

7. Impact strength (kg·cm ) (≥)–50

8. Flexibility (mm) (≤)–1

9. Resistance to salted water (iron red epoxy ester primer: after dipping for 48h; zinc yellow epoxy ester primer: after dipping for 96h)–No bubbling or rust

10. Nitro resistance–No bubbling, expansion or bleeding

11. Cupping test (mm) (≥)–6

12. Grinding property–Easy grinding and no stickiness for abrasive paper