Engineering - Lishi International

Lishi International

An industrial supply company

▶ 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.