Casting Polyurethane prepolymer raw materials

suitable for dynamic applications.

Casting Polyurethane

 1.Propertities:

--High tensile strength

--Good abrasion resistance

--High resilience

--Good behaviour at low temperature

--Good resistance to hydrolysis(water, acid, and base) and to micro-organisms.

2.Usage:

--Suitable for dynamic applications.

--Large variety of applications such as industrial rolls,castors wheels,cushion pads, springs, hydrocyclones, seals…

3.Characteristics:

Item	Unit	Material A	Material B
Appearance at room temperature	23°C	Transparent Yellowish liquid	Colorless Transparent liquid
Viscosity of Prepolymer	mPa.s/75°C	300±100	300±100

4. Instruction:

This instruction is suitable for Double components CPU DHK 280 A/B

A:B=100:100.

(1)Put A and B into the material tank of the machine,temperature is controlled at 70°C,vacuumized ready for use.

(2)Mix material A and B then cast A and B into the ready mould, temperature of mould should be about 90°C.

(3) Demoulding after 25 minutes.

(4) Vulcanizing 6-10 hours to reach the best function. Otherwise, it takes nearly one week at room temperature to reach the same effect.

Note: Both hand casting and machine casting are suitable for this product.

5. Properties of the finished product

Item	Unit	Standard
Hardness	Shore A	80±2
Appearance		Slightly yellowish transparent elastomer
Relative density	g/cm3 25°C	1.21

6. Attention:

(1) Prepolymer should be kept in low-temperature and dry place. Material B should be heated within 3hours in high temperature (above 75°C).

(2)Prepolymer should be finished as soon as possible.

(3) Colorant is advised to be added into material A, and the content of water in material A should be less than 0.1%.  

Casting Polyurethane prepolymer raw materials