Development Zone of Shenzhou County , Hengshui City, Hebei Province, P.R. China
Valve and die casting Powder Coatings
We have solved the air hole problem for coating some special metal wares. For example, the surfaces of some casting ware (aluminum, iron), hot rolling steel plates, zinc electroplated plates are rough, causing air holes in coating layers. The reason is that: during heating and solidifying, the melting and leveling layer seals the surfaces of metal wares, the coating layer will hunch up, causing roughness of surfaces with bad leveling.
Our designated powder coatings for die casting wares solve this problem. In order to acquire good surface effect, we recommend:
1Pre treating and pre heating work pieces;
2Apply sealant as primer, or special primer powder, trying to sand the surface as smooth as possible, without minor air holes;
3Then spray for coating, and oven heating.
| Valve and die casting powder coatings | |||||
| Physical properties | Gravity | 1.4-1.7，up to color and gloss | |||
| Grit size | 100% smaller than 100μm, special requirement should be informed | ||||
| Mobility | 120-140 | ||||
| Properties of Coating layer | Item | Criteria | Result | ||
| Gloss 60° | GB/T9754-88 | 1° to 95°+ | |||
| Impact test | ISO6272 | GB/T1723-1993 | 50cm/kg | ||
| Cupping test | ISO1520 | GB/T9753-1988 | 8mm | ||
| Adhesion | ISO2409 | GB/T 9286-1998 | Grade 0 | ||
| Bending test | ISO1519 | GB/T 6742-1986 | 2mm | ||
| Pencil hardness | ASTMD3363 | GB/T 6739-1996 | 1H-2H | ||
| Salt-fog test | ISO7253 | GB/T 1771-1991 | ＞500h | ||
| Anti-humidity | ISO6270 | GB/T 1740-1979 | ＞1000h | ||
| Heat resistance | 110℃/24h(white) | Excellent gloss retention,△E≤0.3-0.5 | |||
| Attention: 1. Above parameters are gained from oil-free, rust removal cold rolling steel board of thickness of 0.8mm, under experimental circumstances, with coating layer thickness of 70μm; 2. The property data may drop down a little upon gloss reduction. | |||||
| Application conditions: | Consolidation conditions | Standard | 180℃(work piece temperature) 15-20min | ||
| Pre-treating | Low temperature 160℃(work piece temperature) 15min Fast 200℃(work piece temperature) 8min Pre-treating methods differs from different substrates( phosphating process, sand blasting, shot treatment) | ||||
| Spraying | Corona electrostatic spraying ; for other special spraying method (user must propose requirement ahead) | ||||
| Theoretical coverage | 8-10m2/kg, coating layer thickness 60um, up to types and colors | ||||
| Application confine | Indoor | ||||
| other | Packaging and transportation | 20Kg/Carton, with polyethylene bag, Non-dangerous articles, transportation f riendly. Avoiding straight sunlight, humidity, heat, and contact with chemical substances; | |||
| Storing | Stored indoors at 40℃, ventilated, dry, clean warehouse, avoiding fire source, heat radiators, straight sunlight, opening to the air. Warranty period: 6 months. To be used after checking if expired. Unfinished bags should be sealed after opening. | ||||
| Hygiene and security | Bags should be sealed after working. Keep away from fire source. Avoiding intake of powder. Catering and smoking are forbidden in relevant warehouse. Labor should wear anti-static shoes, keep grounding. | ||||
Attentions: We do not recommend use of bright color series such as yellow, orange, red, or metallic color series