Material Types and General Properties
<Table 1>Material types and general properties
Item Type	Temp.R ange("C)		Property
	High Temp.R	Low Temp.R
ACM	150	-10	It is used in diaphragm,hose for automotive application.Good resistance to heat,ozone and oil.Generally attacked by water,alcohol,glycol and aromatic hydrocarbons.The molecular structure contains ethyl acrylate(EA),butyl acrylate (BA),and ethyl acrylate(MEA).High BA content get better low temperature resistance,and high MEA content get more oil resistance.
NR	70	-40	Excellent compression set,high tensile strength,resilience,abrasion,tear resistance,good friction characteristics,excellent bonding capabilities to metal substrate,and good vibration dampening characteristics
VMQ	225	55	The most widely temperature ranges for application.Good weather and ozone resistance,but poor mechanical property and chemical resistance.
PTFE	250	-150	Due to the low friction coefficient,it is used in oil seal lip.However,it is poor elastic property
TPU	100	-40	Polyurethane is one of the groups of elastic thermoplastic materials.PU has been used in seal technology for many years because of their physica characteristics.It is an organic material of high molecular weight whose chemical composition is characterized by a large number of urethane groups.In addition it is characterized by extremely good mechanical properties such as high tensile strength,abrasive resistance,tear strength,and extrusion strength.However t is not resistant to polar solvents,chlorinated hydrocarbons,aromatics,brake fluids,acids,and alkalis
FKM			Excellent chemical resistance except ester and ketone
	200	-25	Dipolymer	Copolymer of vinylidiene fluoride and hexafluoro propylene,and fluorine content is 66%.
		-20	Tripolymer	Copolymer of vinylidiene fluonide,hexafluoro propylene and tetrafluro ethylene.Fluorine content is 68%.Tripolymer has better fluid resistance than dipolymer
XNBR	100	-40	Modification of traditional NBR with the insertion of carboxyl groups It has better tensile strength,modulus,abrasion than NBR

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