PTMG + MDI

Key feature

● Hardness: 70-95A

● Curing agent: 14BDO

● High tensile strength

● Good hydrolysis resistance

● Good mechanical property

Application

This series of PU prepolymer (also named as polyurethane prepolymer) is suitable to make bushes, Castor Wheels, Couplings, Conveyor Rollers, Cutting Boards, Fork-lift Tyres, Gears, Grading Screens, Pneumatic and Oil Seals, Scrapers, Skate Wheels, Wire Guides.

Introduction

"PTMG+MDI" is MDI terminated polyether base PU prepolymer. This polyurethane prepolymer is for casting polyurethane elastomer use. It can be cured by reacting with a polyamine or a polyol hardener. The molding process is composed of pre-heating, degassing, mixing with a hardener, pouring into the mold, curing, demolding and post curing.

PTMG + MDI Polyurethane prepolymer

 

CPU-MT-1070

CPU-MT-1080

CPU-MT-1090

CPU-MT-1095

Hardness (Shore A)

70 ± 2

80 ± 2

90 ± 2

95 ± 2

NCO Content (%)

3.9 - 4.2

6.3 - 6.6

8.2 - 8.5

9.9 - 10.3

Viscosity, (CPS)

3000±500/80oC

21000±4000/25oC

11500±3500/25oC

6750±2250/25oC

1.4 Butane Diol, (pph)

3.8 - 4.1

6.4 - 6.7

8.1 - 8.7

10 - 10.5

Working Temperature
(PU Prepolymer) (oC)

70 - 80

70 - 80

70 - 80

70 - 80

Pot-Life (Min)

3 - 4

3 - 4

7 - 8

3 - 4

Tensile Strength (psi)

2700 - 3400

2900 - 3800

4200 - 5000

6300 - 7900

Elongation (%)

790 - 930

660 - 860

590 - 790

530 - 690

Tear Strength (pli)

330 - 400

400 - 470

550 - 630

410 - 470

 

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