PEEK is a kind of excellent thermoplastic engineering plastics with high-temperature resistance. It has good mechanical properties and resistance to chemicals, abrasion and hydrolysis, and has good self-lubricating property. It can be easily processed and could be used as stuffing for carbon fiber, and molybdenum disulfide to improve their lubricating and mechanical properties.

PEEK has wide applications in many areas, such as aeronautic, machinery, electronics, chemical and automobile industries. It can be used to produce mechanical elements, such as gear, bearing, piston ring, support ring, seal ring, valve plate, abrasion-proof ring, etc.

PEEK has excellent properties, which is as following:

1. High-temperature resistance
   PEEK has a high glass-transition temperature and melting point (334°C), and therefore could be safely used in high-temperature environment. Its thermal transformation temperature is as high as 316°C, with its continuous-operation temperature being 260°C.
2. Mechanical property
   PEEK has a kind of plastics with both stiffness and ductility. It endurance under alternative stress is superior to almost all other plastics, nearly comparable to alloy materials.
3. Self-lubricating property
   PEEK has excellent lubricating property, suitable for application with requirements of low coefficient of friction and resistance to abrasion. When mixed with carbon fiber and graphite, PEEK¡¯s self-lubricating property will be further improved.
4. resistance to chemicals (resistance to corrosion)
   PEEK has excellent resistance to chemical, and can only be dissolved by concentrated sulfuric acid. Its resistance to corrosion is similar to nickel steel.
5. Fire resistance property
   PEEK is very stable. A 1.45mm thick PEEK sample without any other flame-retardant additives could already have good enough fire resistance property, even meeting the most strict fire resistance standards.
6. Peeling resistance
   PEEK has excellent peeling resistance property and therefore could be used to produce electric or electromagnetic wire with very thin cladding, which could be safely used in rigorous environments.
7. Fatigue endurance
   Among all kinds of resin, PEEK has the best fatigue resistance property.
8. Radiation resistance
   PEEK has very good ¦Ã radiation resistance, even superior to polystyrene, which has excellent radiation resistance. It could be used to make high-quality wire, which could be used in environment with an irradiation dose over 1100Mrad.
9. Resistance to hydrolysis
   PEEK and its composites can keep stable in water and high-voltage vapor. This kind of material has satisfactory stability when used in high-temperature and high-voltage water.
   

Main physical parameters of PEEK

No.	Item	Unit	Value
1	Density	g/cm3	1.32-1.4
2	Ratio of moisture absorption	%	0.2
3	Thermal conductivity (23 )	%	0.25
4	Tg		143
5	Tm		334
6	Operating temperature		-180-+260
7	Tensile strength	MPa	94
8	Bending strength	MPa	145
9	Bending modulus	GPa	3.8
10	Dielectric constant	-	3.2
11	Dielectric loss	-	0.0033
12	Volume resistance	.cm	1016
13	Fire resistance property	UL-94	V-0