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CYDHD-531 is a phenolic modified diamine hardener, is widely used for various antiseptic engineering, large-scale architecture and hydraulic projects. It is good at acid and alkali resistance.
Product Decription
CYDHD-531 is a phenolic modified diamine hardener manufactured by Sinopec Hunan Petrochemical Co., Ltd. (enterprise standard Q/SH 1085 007—2025), widely used for antiseptic engineering, large-scale architecture, and hydraulic projects. It provides good resistance to both acid and alkali environments.
CYDHD-531 is supplied in three grades — CYDHD-531(I), (II), and (III) — differentiated by amine value and viscosity, allowing formulators to select a hardener suited to their required reactivity and application method.
Product properties
| Brand | Amine value (mgk OH/g) | Viscosity (mpa.s25℃) |
| CYDHD-531(Ⅰ) | 400-450 | ≤1500 |
| CYDHD-531(Ⅱ) | 450-550 | ≤1500 |
| CYDHD-531(Ⅲ) | 550-650 | ≤3000 |
Formulation
| Products | Epoxy resin | Hardener |
| Mixing and Processing | CYD-128/E-44 | CYDHD-531 |
| 100 | 15-30 | |
| Curing condition | Gel time(160g 25℃) | 20-50min |
| Curing time | 2 -7 days |
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Our products have passed various industry certifications
