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The molecular structure of polyethyleneterephthalate can be produced either as an amorphous or semi-crystalline thermoplastic. The amorphous type is crystal clear with lower mechanical stability and inferior sliding properties. The semi-crystalline types, on the other hand, have a high level of hardness, rigidity and stability with excellent sliding properties and low sliding abrasion. Because of its good creep resistance, low level of moisture absorption and excellent dimensional stability, the material is ideally suited for complex parts with the highest demands on dimensional stability and surface finish. For the reasons mentioned above, only the semi-crystalline type is suitable for sliding applications. |
PET (Polyethyleneterephthalate) |
| The wear resistance and sliding properties of PET-Tef (oftenly called PET-G) have been improved compared to pure PET by adding special, homogeneously distributed solid Teflon (PTFE) as lubricating agent. The polyethylene terephthalate semi-finished products that we offer are manufactured from semi-crystalline types in an extrusion process. PET grades are defined for FDA compliant applications and for bearings, pumps, parts for housings, tank lids, cogwheels & insulators. PET may be used at temperatures ranging -40°C to +110°C. Sliding properties PET has excellent sliding properties, very good wear resistance and, in combination with its other properties, is an excellent material for highly loaded sliding applications. This also applies to applications where high levels of humidity or wetness are expected. The modified type PET-Tef is especially suitable for highly loaded sliding applications in dry running operations due to its integrated solid lubricating agent. The solid lubricating agent “self lubricates” the PET-Tef, which gives it excellent sliding properties and highest wear resistance with a much higher load-bearing strength (PV-limiting value) compared to pure PET. It also prevents the stick-slip effect. The other properties are equal to those of pure PET. Weathering effects PET is not resistant to UV rays. The material surface changes when subjected to UV rays in combination with atmospheric oxygen. If the material is to be subjected to UV rays for longer periods, a black coloured type is recommended. Chemical resistance PET is resistant to weak acids and alkaline solutions, salt solutions, perchlorinated and fluorinated hydrocarbons, oils, fuels, solvents and surface-active substances. Strong polar solvents have an irreversible swelling effect. PET is not resistant to strong acids or alkaline solutions, esters, ketones or chlorinated hydrocarbons. Behaviour in fire PET is rated as normal flammable. When the source of ignition is removed, PET continues to burn, forming droplets. The oxygen index (the oxygen concentration required for combustion) at 23 % is average compared to other plastics. Areas of use
Applications
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Mr. Girish Dhawan
(Proprietor)
No. 170, Gali Bandook Wali, Ajmeri Gate
New Delhi,
Delhi -
110 006,
India
Telephone:+(91)-(11)-23215389/ 32972567
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