Lishi International

An industrial supply company

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Position

With experieced engineers, LISHI is good at rubber and plastic products research and development.


APPLICATION ANALYSIS

According to the prints, installation procedures and environment, analysis the material, structure and manufacuring processes. 


MATERIAL SELECTION

Rubbers: Nitrile(NBR), Polyacrylate(ACM), Fluoroelastomer(FKM), Silicone(VMQ), Ethylene Propylene Diene Monomer(EPDM), HNBR, Teflon(PTFE), etc.

Plastics: Polycarbonate(PC), Polyamide(Nylon, PA), Polyacetal, Polyoxy Methylene(POM), Polyphenylene Oxide(PPO), PET, PBT, Polyphenylene Sulfide(PPS), etc.


BASIC POLYMERS

NITRILE

POLYACRYLATE

FLUOROELASTOMER

SILICONE

TEFLON

ETHYLENE ACRYLIC

SUMP OIL TEMPERATURE RANGE

-40°F~230°F

-40°C~110°C

-40° F~275° F

-40°C~135°C

-40°F~302° F

-40°C~150°C

-94°F~302° F

-70°C~150°C

-112°F~392° F

-80°C~200°C

-40°F~302° F

-40°C~150°C

Oil Resistance

Very good

Very good

Very good

Fair

Very good

Fair

Acid Resistance

Good

Fair

Fair

Fair

Very good

Good

Alkali Resistance

Good

Poor

Fair

Poor

Very good

Very good

Heat Resistance

Good

Very good

Very good

Very good

Very good

Good

Cold Resistance

Good

Very good

Fair

Very good

Very good

Good

Water Resistance

Good

Fair

Good

Good

Very good

Good

Sunlight Resistance

Good

Very good

Very good

Very good

Very good

Fair

Oxidation Resistance

Good

Poor

Good

Very good

Very good

Very good

Wear Resistance

Very good

Very good

Very good

Good

Fair

Fair

Ozone Resistance

Good

Very good

Very good

Very good

Very good

Very good

Note: Water resistance includes steam. No elastomeric material is ideally compatible with water as it is very poor lubricant.


PROPERTY
(73º F)

SPECIFIC GRAVITY

TENSILE STRENGTH

TENSILE MODULUS OF ELASTICITY

TENSILE ELONGATION

FLEXURAL STRENGTH

FLEXURAL MODULUS OF ELASTICITY

HARDNESS
Rockwell

IZOD IMPACT
(notched)

UNITS

psi

psi

%

psi

psi

scale as noted

ft-lbs /in

ASTM TEST

D-792

D-638

D-638

D-638

D-790

D-790

D-785

D-256

ABS

1.04

4,100

294,000

32

9,100

304,000

R102

7.7

HDPE

0.96

4,000

-

600

-

200,000

-

-

LDPE

0.92

1,400

-

500

-

30,000

-

no break

NYLON
(6/6 Extruded)

1.14

12,400

470,000

90

17,000

410,000

M80, R121

1.2

NYLON
(6 Cast)

1.15

12,500

400,000

20-40

13,500

330,000

R118

0.8

PBT

1.3

8,690

416,000

300

12,000

330,000

M72

1.5

PEEK

1.32

14,000

490,000

60

24,600

590,000

M99, R126

1.6

PET
(Semicrystalline)

1.38

11,500

400,000

70

15,000

400,000

R117

0.7

PP
(Homopolymer)

0.91

5,400

-

-

-

225,000

R92

1.2

PP
(Copolymer)

0.9

3,800

-

-

-

215,000

R92

12.5

PPS

1.35

12,500

480,000

4

21,000

600,000

M93

0.5

PTFE

2.15

1,500-3,000

-

100-200

-

72,000

-

3.5



SRUCTURE DESIGN

CAE, Prototype, 3D Printing


PROCESS OPTIMIZATION

Replace the metal parts, especially die-casting parts with 

plastic parts. Reduce the part weight, cost and lead-time, 

protect the environment.