+8613706519013
BHC Polymer Additives Co., Ltd / Shanghai Crystal Wells Chemical New Materials Co., Ltd.
A guide to building rubber-to-metal and rubber-to-fabric bond strength with pre-dispersed resorcinol-formaldehyde resin and cobalt/nickel activator masterbatches.
The Adhesion Challenge
Steel cord and fabric reinforcements often peel or show low H-pull values. A resorcinol-formaldehyde resin plus cobalt/nickel activator is the proven route to durable bonding.
How the System Works
RF-70 (resorcinol resin) reacts with the rubber phase during cure; RA-65 (cobalt/nickel activator) promotes the metal-to-rubber interface. Pre-dispersion avoids toxic resorcinol dust.
Dosage & Process
RF 2–4 phr together with RA 1–2 phr, added at the mixing stage. Cure temperature and time directly affect bond strength.
Applications
Tire belts, steel-cord conveyor belts, hose reinforcement and rubber-to-metal mounts.
TDS / Technical Data Sheet
| Products | RF-70 Resorcinol resin / RA-65 Activator |
| RF active content | 70% min. |
| RA active content | 65% min. Cobalt/Nickel complex |
| Carrier | EPDM / SBR polymer |
| Appearance | Brown granules |
| Bond test (H-pull) | Reported per batch COA |
| Shelf life | 9 months (resin sensitive to moisture) |
SDS Highlights
Contains resorcinol and cobalt complex – classified as harmful if swallowed and a suspect carcinogen. Wear gloves, goggles and respiratory protection; avoid dust. Store tightly sealed and dry.
COA Sample
| Batch No. | RA25-0830 |
| RF resin content | 70.5% |
| RA activator content | 65.3% |
| H-pull bond (N) | 1180 (typical) |
| Peel strength | Conforms |
| Result | PASS |
Product Information
| Packaging | 25 kg paper bag (RF and RA packed separately); 1,000 kg per pallet |
| MOQ | 300 kg (approx. 12 bags) |
| Shipping port | Shanghai Port / Ningbo Port, China |
