Polyoxymethylene (POM / Acetal)

Polyoxymethylene (POM / Acetal)

Polyoxymethylene (POM), also known as acetal or polyacetal and polyformaldehyde is an engineering thermoplastic used in precision parts requiring high stiffness, low friction and excellent dimensional stability. As with many other synthetic polymers, it is produced by different chemical firms with slightly different formulas and sold variously by such names as Delrin, Celcon, Ramtal, Duracon, Kepital and Hostaform.
Typical applications for injection-molded POM include high performance engineering components such as small gear wheels, ball bearings, ski bindings, fasteners, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry.

General Properties:

Chemical properties

  Minimum value Maximum value Unit Sources
Solidification shrinkage 1.8 3.2 % Idemat 2003
Water absorption 0.25 0.25 % Idemat 2003

Electrical properties

  Minimum value Maximum value Unit Sources
Solidification shrinkage 1.8 3.2 % Idemat 2003
Water absorption 0.25 0.25 % Idemat 2003

Mechanical properties

  Minimum value Maximum value Unit Sources
Bending strength 50 80 MPa Idemat 2003
Compressive strength 31 31 MPa Idemat 2003
Creep strength     MPa  
Density 1410 1420 kg/mÂ3 Idemat 2003
Elongation 25 25 % Idemat 2003
Fatigue failure     MPa  
Friction coefficient 0.2 0.35   Idemat 2003
Impact strength 0.53 1.2 J/cm Idemat 2003
Shear modulus 900 930 MPa Idemat 2003
Tensile strength 69 72 MPa Idemat 2003
Thickness     MPa  
Yield strength     MPa  
Young’s modulus 2900 3500 MPa Idemat 2003

Optical properties

  Minimum value Maximum value Unit Sources
Refractive index 1.48 1.48   Idemat 2003

Thermal properties

  Minimum value Maximum value Unit Sources
Glass temperature     °C  
Melting temperature 175 175 °C Idemat 2003
Service temperature -60 110 °C Idemat 2003
Specific heat 1465 1465 J/kg.K Idemat 2003
Thermal conductivity 0.23 0.37 W/m.K Idemat 2003
Thermal expansion 81 104 e-6/K Idemat 2003

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.
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