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Engineering Plastics--UHMWPE


    UHMW Polyethylene products originate with the higest grade resins,the molecular weight from 3 million to 9 million, Comparing to any thermo plastics polymer. It has an outstanding plastics properties with the best wear Resistant, Impact Resistant, Self Lubricating, Corrosion Resistant, impact absorbing properties , low temperature resistant, s anitary, Non-caking and sticking, non water absorption, light weight properites, so regarded as an amazing material.

1Property

1.Mechanical Properties

Item

Unit

Test Method

Value

Density

G/cm 3

ASTM1505

0.94

Tensile Strength at Break

Mpa

D638

42

Elongation at Break

%

D638

350

Izod Impact

Kj/m 2

D256

100

2.Thermal properties

Item

Unit

Test Method

Value

Melting point

ASTMD2117

136

Vicat softening poin

ASTMD1512

134

Thermal Expansion Coefficient

10 4 /

ASTMD648

1.5

Thermal Deformation Temperatu re

ASTMD648

90

3.Electrical properties

Item

Unit

Test Method

Value

Bulk Resistivity

Ohm.cm

ASTMD257

10 17

Surface Resistivity

Ohm.cm

ASTMD257

10 13

Dielectric Strength

KV/mm

ASTMD149

900

Dielectric Coefficient

10 6

ASTMD150

2.3

4.Cold properties
     UHMWPE molecular weight excess 1.5 million, brittle temperature low to -150 档 Lab test: working temperature below -269 , also have some mechanical strength.

5.Abrasion resistant properties
     UHMW-PE with super abrasion resistance, the more molecular high, the more wear resistance has

Material

UHMW-PE

PTFE

PA66

POM

Carbon stell 45#

Stainless steel

brass

Abrasion rate

0.74

2.31

1.51

3.1

4.02

4.05

16.74

Note abrasion test condition
Samples are abraded in a 3/2 sand/ water (sand 20 mesh),test piece turn speed930 rpm for 7 hours, test piece size: 60mm 35mm 4mm

Abrasion sheet for different molecular sheet

Molecular weight(million)

Average Abrasion rate

9.3
0.29

7.0

0.31

5.7
0.36

4.0

0.41

3.8

0.50

2.8

0.50

1.6

0.74

6.Impact strength for different material

Material

UHMW-PE

HDPE

ABS

PA66

PC

POM

PTEE

Impact strength Kj/m 2

100

27

16 44

6 11

71 95

8 13

16

Note: test according to ASTMD256

7.Self lubrication
     Due to small coefficient of frication, so it has better self lubrication, only less PTFE materil while work. without grease.During the working condition fo slipping or turn, it works better than steel or bronze bearing with grease, in frication field, it's name perfect frication material with low cost.

 

Material

UHMWPE

PA66

PC

ABS

PTFE

Rubber sold

Graphite graphite

Glass glass

Steel steel

Frication coefficient

0.07-0.11

0.37

0.36

0.38

0.04-0.10

1-4

0.1

0.9-1

0.58

8.Water absorption rate
     UHMW-PE's surface absorption affinity is very feeble, materials are difficult to stick to it. UHMW-PE's water absorption is less than 0.01% only 1% that of nylon66,in water environment it's very stable, resists the attached of algae and fungus.

Materil

UHMW-PE

ABS

PA66

PC

POM

PTEE

Water absorption rate

0.01

0.20 0.45

1.5

0.15

0.25

0.01

Note: test method according to ASTM570

9. Excellent chemical Corrosion Resistant
     UHMWPE chemical stability is high, it can resist various corrosive media (such as acids , salts and alkalis) and organic solvents in certain range of temperature and concentration

10.Sanitation
     The uhmpwe has the property of insipid , non toxic and no causticity itself. It's approved by FDA AND USDA that it could be used in food and pharmacy industry

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