PET is an unreinforced, semi-crystalline thermo-plastic polyester derived from polyethylene terephthalate. Its excellent wear resistance, low coefficient of friction, high flexural modulus, and superior dimensional stabilty make it a versatile material for designing mechanical and electro-mechanical parts. Because PET has no centerline porosity, the possibilty of fluid absorption and leakage is virtually eliminated.
|Physical Properties||ASTM Test Method||Units||PET|
|Water absorption, 24 hours||D570||%||0.1|
|Mechanical Properties||ASTM Test Method||Units||PET|
|Specific Gravity||D792||g/cu cm.3||1.38|
|Tensile Strength at break, 73°F||D638||psi||11,500|
|Tensile Modulus, 73°F||D638||psi||4X105|
|Elongation at break, 73°F||D638||%||70|
|Flexural Strength, 73°F||D790||psi||15,000|
|Flexural Strength, 73°F||D790||psi||4X105|
|Izod Impact Strength, Notched, 73°F||D256||ft-lbs/in.||0.7|
|Coefficient of Friction @ 40psi, 50 fpm||-||Static / Dynamic||0.19/0.25|
|Thermal Properties||ASTM Test Method||Units||PET|
|Heat Deflection, 264 psi||D648||°F||175|
|Coefficient of Linear Thermal Expansion||D696||in./in./-°F||3.9 X 10-5|
|Applicable Temp. Range for Thermal Expansion||-||°F||50 – 250|
|Max. Serving Temperature for Long Term||-||°F||230|
|Electrical Properties||ASTM Test Method||Units||PET|
|Volume Resistivity, 73°F||D257||ohm-cm||1016|
|Dielectric Constant @ 60 Hz, 73°F, 50% RH||D150||-||3.4|
|Dissipation Factor, @ 60 Hz, 73°F||D150||-||0.002|
"ONGC - Oil and Natural Gas Corporation Limited" - Our complex drilling application where Shaft was eccentric and application was robust & muddy. Replacement was never easy. Mech Spares designed Oil seals resolved difficulty. This gave a complete joy to my maintenance team.
"Mr Mohammed Al Duaigy" of (Kuwait National Petroleum Company) : We tried several diaphragms from renown worldwide Rubber manufacturing companies. We found Mech Spares technical know how and product to be of great durability and lasted 3 times more then anticipated. They have accurate understanding of there products.
"McCafferty BM Design Ltd, KENT United Kingdom" - Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive elastomer is the best for all applications. We trust Mr Nilesh chodhari completely for all our O rings designing applications.
"Dr. A. Singh" of BARC: The electric Insulation mat manufactured by MECH SPARES as per IS 15624 tested at ERTL and found to withstand 40 Kv and still didn't tear. We have been using since 5 years and still didn't generate any fatigue. They arranged bulk delivery in short period.
"Tata Steel" - One of our old machines started making loud noise and disturbed the entire village. We were compelled to stop the machines which lead to huge production loss. With the help of Mech Spares designed bellows in two part we could retain the lubrication and eliminate the noise.
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