HARTCURE E333 Polyisocyanate Curing Agent
HARTCURE E333 is an established, universal light-color curing agent for adhesives based on hydroxyl polyurethane, natural and synthetic rubber. It possesses great anti-yellowing resistance and is particularly effective in the bonding of rubber products, especially when achieving a light color is a strict requirement.
Composition: 27% thiophosphoric-tris-(p-isocyanato-phenyl ester) and 73% ethyl acetate. Equivalent to Desmodur RFE.
Typical Properties
| Property |
Value |
| Appearance |
Colorless to light-color liquid |
| NCO Content |
7.2±0.2% |
| Composition |
27% thiophosphoric-tris-(p-isocyanato-phenyl ester) + 73% ethyl acetate |
| Solubility |
Soluble in various esters, ketones and aromatic solvents |
Compatibility with Solvents
E333 can be diluted with anhydrous and alcohol-free ethyl acetate, dichloropropane, trichloroethylene, acetone, methyl ethyl ketone, toluene and other solvents. Solutions of natural rubber in aliphatic hydrocarbons show good compatibility with E333.
Performance
HARTCURE E333 improves the adhesion of materials such as plasticized PVC, high-oil-content SBR, top layer leather and silk.
Recommended Amount (per 100 p.b.w. adhesive)
| Adhesive Base |
HARTCURE E333 |
| Graft-Chloroprene rubber (approx. 16% rubber) |
3-5 p.b.w. |
| Chloroprene rubber (approx. 20% rubber) |
5-7 p.b.w. |
| Hydroxyl polyurethane (approx. 15% polyurethane) |
3-5 p.b.w. |
Storage
Reacts readily with moisture; keep dry and store at temperatures between 5°C-32°C for best performance.
Package
0.75kg aluminum bottle, standard carton of 20 bottles; 180kg iron drum.
FAQ
Q1: What is HARTCURE E333 used for?
A: HARTCURE E333 is a universal light-color curing agent for adhesives based on hydroxyl polyurethane, natural and synthetic rubber. It improves the adhesion of materials such as plasticized PVC, high-oil-content SBR, top layer leather and silk.
Q2: How much HARTCURE E333 should be added to the adhesive?
A: For every 100 parts by weight (p.b.w.) of adhesive, add 3-5 p.b.w. for graft-chloroprene rubber (approx. 16% rubber), 5-7 p.b.w. for chloroprene rubber (approx. 20% rubber), and 3-5 p.b.w. for hydroxyl polyurethane (approx. 15% polyurethane).
Q3: How should HARTCURE E333 be stored?
A: E333 reacts readily with moisture, so keep it dry and store at 5°C-32°C. As a two-component curing agent, adhesives mixed with E333 must be used within the operating period; once the mixture thickens and becomes viscous, it can no longer be used.
