Description
Special properties polyurethane prepolymer solvent resistant
Key features
Can be used for organic solvents, such as esters, toluene, printing ink, water-based ink, ketones, etc.
Typical properties
|
Solvent resistant
|
SR-551
|
SR-552
|
SR-553
|
|
Prepolymer
|
Appearance (25℃)
|
Waxy
solid
|
viscous liquid
|
Waxy solid
|
|
NCO Content(%)
|
5.5~6.5
|
3.0~3.5
|
3.0~3.5
|
|
Using
Mixture Ratio (PHR)
|
16.0~16.6
|
7.1~8.3
|
7.1~8.3
|
|
Life
in the Reaction Kettle (75~78℃/min)
|
10~12
|
3~5
|
3~5
|
|
Physical
Properties of Finished Products
|
Hardness
(Shore D)
|
55±5
|
75±5
|
85±5
|
|
Tensile
Strength (MPa)
|
16.6
|
38.2
|
44.7
|
|
Tearing
Strength (kN/m)
|
23.4
|
67.5
|
69.8
|
|
Elongation
at Break (%)
|
570
|
710
|
512
|
|
TOL/EA/CYC mixed solvent
24h expansion rate（%）
|
﹢15
|
﹢9
|
﹢10
|
Application
-Mainly used in the production of a variety of special gaskets, seals, high and low hardness printing roller, screen printing scraper, etc.
Usage method
-Can be used for manual, some products are more suitable for the operation of pouring machine, chain extender for MOCA, E-300, BDO or special chain extender.
Attention
The prepolymer should be stored at a low temperature and dry place, at higher temperatures (more than 75 degrees Celsius) should not be heated for more than 3 hours.
After the opening of the prepolymer should be used up as soon as possible, if not exhausted with nitrogen seal.
The storage period of unopened prepolymer is three months.
If you want to add color paste or other materials, keep the water content below 0.1%, and consider the compatibility of additives.
