Urethane Rubber

Key feature

● Hardness: 50-90A

● Appearance: White to cream color solid

● Can be processed by conventional rubber manufacturing
   equipment

● Harmless to human beings

Application
Seal, seal material. mechanical shock buffer material and parts of electronics industries and so on.
Introduction

UR SERIES is Polyester urethane rubber, which is an easy to process millable gum especially developed for improved compounding and processing benefits. It can be processed and compounded by the use of conventional rubber manufacturing equipment and techniques to yield finished urethane parts.

Technical Data

Chemical type

Polyester urethane

Physical form

Solid

Color

White to cream

Odor

Faint, characteristic

Specific gravity

1.15

Mooney

viscosity

ML 1-4 at 100

35-65

Storage stability

Excellent

Health hazard

None

Typical Physical Properties

Series UR.

MPU50

MPU60

MPU70

MPU80

MPU90

Hardness, A

50

60

70

80

90

Tensile Strength, psi

3900

3360

2820

1830

1100

300% Modulus, psi

480

580

1100

1400

900

Elongation, %

700

640

600

420

310

Tear ( Die C) pli

180

220

245

270

165

Compression Set 22hts. @ 158

49

62

70

96

98

Molding

Compounds of URETHANE RUBBER can be molder by compression, injection and transfer molding procedures. Excellent mold definition is obtainable in press cures. The linear shrinkage of vulcanized of UR varies somewhat with the type of loading, but in general this value is approximately 1.5%, which is comparable to that of neoprene.

 

Optimum press cures are obtained with peroxide curing system, temperatures from 305oF to 340oF with cycles ranging from 4 to 5 minutes.

 

Excellent mold release is provided by lubricant or silicone mold release lubricants, but indiscriminate use can cause poor flow and knitting problems.

 

Notice: These values are based on the test of our present laboratory test specimens.