The light-color HARTDUR E333 is an established, universal curing agent for adhesive based on hydroxyl polyurethane, natural and synthetic rubber. HARTDUR E333 can be used instead of HARTDUR F256. HARTDUR E333 is even more satisfactory from the aspect of industrial hygiene.
Typical Properties
| Chemical composition |
Contains 27% thiophosphoric-tris-(p-isocyanato-phenyl ester) and 73% ethyl acetate |
| Intrinsic color |
almost colorless to light-color clear liquid |
| NCO% |
7.2 ± 0.2 |
| Solubility |
Soluble in various esters, ketones and aromatic solvents |
| Storage stability |
Reacts readily with moisture; for bestperformance it should be kept dry and stored at temperatures between 5℃~32℃. |
Comptibility with solvents: HARTDUR E333 can be diluted with anhydrous and alcohol-free ethyl acetate
dichloropropane, trichloroethylene, acetone, methyl ethyl ketone, toluene, and other
solvents. The addition of relatively large proportions of aliphatic hydrocarbons can
cause turbidity; but the solutions of natural rubber in aliphatic hydrocarbons show good compatibility with HARTDUR E333, in the absence of other solvents.
Application: After the addition of HARTDUR E333, the ready-to-use double-component adhesive
should be applied within a period (pot life) which is determined not only by its
content of rubber, but also by the other ingredients of the formulation (e.g. resins, antioxidants, solvents, etc.). If the adhesive is not used within this period, it may become increasingly difficult to apply and its viscosity increases rapidly until irreversible gelling ultimately occurs.
Suggested Additions: For curing adhesive of 100 parts by weight (p.b.w.) based on:
Graft-Choloroprene rubber (rubber content approx. 16%): 3-5% p.b.w. HARTDUR E333
Choloroprene rubber (rubber content approx. 20%): 5-7 p.b.w. HARTDUR E333
Hydroxyl polyurethane (polyurethane content approx. 15%):3-5 p.b.w. HARTDUR E333
Package:
A:each 0.75 kg in an aluminum bottle.
B:each 20 bottles in a standard carton.
C:each 180 kg in each iron drum.
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