Polyethylene Terephthalate (PET)

Polyethylene-TerephthalatePET-Sheet

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.

General Properties:

Physical Properties

ASTM Test Method

Units

PET

Density D792 lbs/cu in.3 0.0499
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 4 X 105
Elongation at break, 73°F D638 % 70
Flexural Strength, 73°F D790 psi 15,000
Flexural Strength, 73°F D790 psi 4 X 105
Izod Impact Strength, Notched, 73°F D256 ft-lbs/in. 0.7
Rockwell Hardness D785   R117
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
Melting Point   °F 490
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
Flammability UL94   HB

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
Dielectric Strength D149 V/mil 400

Member Testimonials

ONGC – Oil and Natural Gas Corporation Limited

"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.
2014-06-08T07:48:57+00:00
“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.

Kuwait National Petroleum Company

"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.
2014-06-08T07:49:23+00:00
“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

"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.
2014-06-08T07:50:26+00:00
“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 View Full →

Bhabha Atomic Research Centre ( BARC )

"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.
2014-06-08T07:16:20+00:00
“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

"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.
2014-06-08T07:17:16+00:00
“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.
View O Ring Reference Chart