F256, RF, isocyanate-base hardener/crosslinker for adhesives F256, RF, isocyanate-base hardener/crosslinker for adhesives F256, RF, isocyanate-base hardener/crosslinker for adhesives F256, RF, isocyanate-base hardener/crosslinker for adhesives
F256, RF, isocyanate-base hardener/crosslinker for adhesives F256, RF, isocyanate-base hardener/crosslinker for adhesives F256, RF, isocyanate-base hardener/crosslinker for adhesives F256, RF, isocyanate-base hardener/crosslinker for adhesives

HARTDUR F256 (RF/JQ-4)

Trade NameRF / JQ-4 / TPTI

Similar Name

Molecular Formula

Tris(4-isocyanatophenyl) thiophosphate; thiophosphoric-tris-(p-isocyanato-phenyl ester)

C21H12N3O6PS

CAS Number:4151-51-3

HARTDUR F256 (RF) is an established, universal cross-linker for adhesives based on hydroxyl polyurethane, natural, and synthetic rubber. HARTDUR E333 possesses excellent heat and solvent resistance, and it is particularly effective during the bonding of rubber products, especially when a light color appearance is a strict requirement.

Compatibility with solvents

Hartdur F256 can be diluted with anhydrous and alcohol-free methylene Chloride dichloropropane, trichloroethylene, acetone, ethyl ketone, methyl ethyl ketone, toluene and other similar 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 F256 without adding other solvents.

Package

  1. 1 KG / Aluminum bottle ; 20 Bottles / Carton.
  2. 250 KG / Iron Drum

It can be packaged on demand. Please inquire.     


Hartdur F256 is a two-component adhesive. After a certain proportion of Hardtur F256 is added to the adhesive, this mixed adhesive must be used within the operational period (pot life) which is influenced not only by its content of rubber, but also by other ingredients of the formulation (e.g. resins, antioxidants, solvents, and etc.). When the operating period is not used in time (usually delayed by a few hours or even one working day), the adhesive will become very thick and too viscous to use.

Dosage

For curing adhesive of 100 parts by weight (p.b.w.) based on:

Graft-Chloroprene rubber

(rubber content approx. 16%)

3-5% p.b.w. Hartdur C528

Chloroprene rubber

(rubber content approx. 20%)

5-7% p.b.w. Hartdur C528

Hydroxyl polyurethane

(polyurethane content approx. 15%)

3-5% p.b.w. Hartdur C528


Generally, the usage amount of curing agent is about 3%~5% of the adhesive, but when the humidity in the air increases, the amount of curing agent should be slightly increased. However, please don’t add over 10%. Meanwhile, when the room temperature increases, the reaction speed of the curing agent and the adhesive increases, too. Therefore, the amount of curing agent should be decreased.


Chemical Name Tris(4-isocyanatophenyl) thiophosphate chloride; thiophosphoric-tris-(p-isocyanato-phenyl ester)
CAS No. 4151-51-3
AppearanceClear light yellowish liquid
NCO Content (%)5.4 ± 0.2
Viscosity (cps, @20°C)approx. 10 sec flow time
Solid Content (%)20.00 ± 1.0
SolventMethylene chloride
Package0.75 kg/bottle (20 bottles/carton) & 200 kgs/metal drum
Self Life6 months since production date.

High purity of Hartdur F256 is reflected in its good crystallization property and with better photo-resistance.


  • Crosslinking agent (e.g. polyurethane, chloroprene rubber…)
  • Adhesive for shoes
  • Adhesion promoter