PU
Cast polyurethane(PU) is a new composite material between plastic and rubber .PU is formed after chemical reaction of polymer polyalcohol and isocyanate through chain extension and cross linkage ,it is divided into polyether (PPG) and polyester according to its backbone chain.
Features:
High load bearing capacity;More durable than conventional elastomers;Can be machined, drilled, sawn, turned and shaped;Wide range of physical properties ;
High impact resistance;Low unlubricated coefficient of friction;Good water resistance;Resists cracking under repeated flexure;Remains flexible at very low temperatures
Applications ,Conveyor drive and idle rollers ;Hydraulic and pneumatic seals ;Pump impellers ;Bearing pads , rollers , gear wheels , bushes ;Crane wheels ;Conveyor belt scraping blades ;Wear parts ;Printing rollers ;Cyclone nozzles
Technical Data
|
Property
|
Unit
|
PPG
|
Polyester
|
|
Hardness
|
Shore
A
|
80±2
|
90±2
|
75±2
|
90±2
|
|
Density
|
g/cm3
|
1.1
|
1.1
|
1.23
|
1.23
|
|
NCO
Content
|
%
|
4.0±0.1
|
5.2±0.1
|
2.5±0.1
|
4.1±0.1
|
|
Viscosity
|
---
|
400~600
|
150~250
|
1300~1800
|
1200~1700
|
|
Tensile
Strength
|
MPA
|
15~17
|
25~28
|
32~35
|
45~50
|
|
Tear
Strength
|
KV/M
|
50~55
|
80~90
|
60~70
|
100~110
|
|
100%
Modulus
|
MPA
|
3.6
|
6.6
|
2.3
|
6.7
|
|
300%
Modulus
|
MPA
|
6.1
|
12.1
|
3.7
|
12.8
|
|
Elongation
at Break
|
%
|
590~630
|
450~500
|
850~900
|
630~700
|
|
Abrasion
Wear
|
mm3/1.61h
|
≤0.06
|
≤0.05
|
≤0.025
|
≤0.013
|
|
Compression
Defromation
|
%
|
40
|
45
|
25
|
26
|