POM sheet or poly oxy methylene (POM) is a name of popular plastics which are widely used in the engineering world. POM sheets are also known as acetal, polyacetal, and polyformaldehyde.
POM sheets and plates are counted among stiffest of all thermoplastics. They’re generally produced by different chemical firms with slightly different formulas such as; Ramtal, Delrin, Celcon, Duracon, Kepital, and Host form.
Types of Poly Oxy Methylene
The POM sheets are divided into two types;
- Homopolymer POM – the process of direct polymerization results in homopolymer. It comprises of higher crystallinity and often results in higher stiffness.
- Copolymer POM – Copolymer is created when formaldehyde is converted to trioxane. This procedure is totally polymerized together with a co-monomer, to a POM copolymer (e.g. Host shape).
It has high chemical resistance, it regularly brings about less warm debasement while generation, and in the field.
Best features of POM sheets
The best features pf POM sheets are given below;
- The POM sheet is determined by its hardness, high firmness, high quality, low rubbing, unbending nature to −40 °C, and fantastic dimensional security.
- Since it has a high crystalline creation, so it looks murky white, but on the other hand, it’s accessible in another assortment of colors. The most extreme thickness of POM is 1.410– 1.420 g/cm3.
- POM sheet is versatile for its diversified engineering applications. Its function works in CNC machining, and POM sheets are also available with an enhanced bearing grade material.
Properties of POM
The few highlighting properties of POM sheets are;
- Good resilience
- Low water absorption
- High stiffness
- Low wear
- Excellent dimensional stability
- Continuous use temperature of 180°F
- Porosity free
- Consistent properties in wet or moist environments
- Very low moisture absorption
- Excellent electrical properties
- Easy to machine to close tolerances
- Natural and Black are FDA & USDA compliant
- Bushings and bearings
- Rollers and gears
- Valves and manifolds
- Scraper blades
- Wear strips and pads
- Jigs and fixtures
- Electrical components
- Parts which operate in water between 60 to 90C
- ASTM POM 0211, D6778
- FDA21 CFR 177.2470
|Tensile strength||ASTM D638||Mpa||100|
|ultimate elongation||ASTM D638||%||10|
|bending strength||ASTM 790||Mpa||150|
|bending modulus||ASTM 790||Mpa||4500|
|Impact strength||ASTM D256||J/M||100|
|working Temp.||ASTM D648||℃||140|
|dilatation coefficient||ASTM D696||10-5-1/K||6|
|dielectric strength||ASTM D150||KV-mm||22|
|dielectric loss coefficient||ASTM D150||–||0.005|
|Volume resistance||ASTM D257||Ω.cm||1014|
|surface resistance||ASTM D257||Ω||1016|
|dielectric constant||ASTM D149||–||3.9|
|Water absorption||23℃ 60%RH||%||0.35|
|Acid resistance||23℃ 60%RH||+|
|Resistance to acid and alkali water||+|
|Chloric acid alkali resistance||0|
|Resistant to aromatic compounds||+|
|The ketone resistance||23℃ 60%RH||+|
|Water resistance||23℃ 60%RH||+|
|Non-toxic harmless||EEC 90/128 FDA||+|
|friction coefficient||DIN 53375||–|