Product introduction:
Blackening agent is made up of many kinds of organic antirust agent, organic colorant, emulsified dispersant and anti rust agent through a number of processes. The surface of steel workpieces is blackened by deposition of film by thermal condensation, which plays the role of rust prevention and protection. PURUN PR508 is a matt and weak base blackening agent. It is suitable for blackening of steel and metal parts after medium temperature tempering. It is non-toxic and eco-friendly, good blackening effect, easy for oiling, and its anti rust performance is excellent.
Product Features
- Workpiece surface in dark black, very excellent effect.
- Suitable for mesh belt furnace, not sticky, and no scratches and spots.
- Long hours against salt spray test.
- Safe and eco-friendly, non-toxic and non-volatile.
Product Parameter:
| Item |
PURUN PR 508 |
Standard |
| Appearance |
Black liquid |
Visual |
| Density |
1.02~ 1.08 |
GB/T 21784.2 |
| pH value |
8.0 ~ 9.0 |
GB/T 9724 |
| Corrosion resistance |
3%CuSO4 dipping |
qualified |
GB/T 15519 |
| 5% oxalate dipping |
qualified |
Audited Supplier 
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