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 PR520B is a matt black water soluble and weak blackening agent. It is suitable for blackening of steel metal parts after medium temperature tempering. It is non-toxic and eco-friendly. PR520B has good blackening effect and is easy for oiling, and its anti rust performance is excellent.
Product Features:
1.The blackening film is smooth and dark with good appearance.
2.High temperature resistance and strong aging resistance.
3.Safe and eco-friendly, non-toxic and non-volatile.
Product Parameter:
| Item |
KERUN PR 520B |
Standard |
| Appearance |
Black liquid |
Visual |
| Density (20ºC), g/ml |
1.02~ 1.07 |
GB/T 4472 |
| pH value |
8.0 ~ 9.5 |
GB/T 9724 |
| Corrosion resistance |
3%CuSO4 dipping |
qualified |
GB/T 15519 |
| 5% oxalate dipping |
qualified |
Shelf life
Products that have passed the factory inspection should be used within a year. If they are not used within this period, they can only be used after passing a re-inspection.
Audited Supplier 
){kind=link}
){kind=link}