Product Guide for Design Engineers - Quadrant

General Engineering Plastics for Medium Temperature Range
Ertacetal ® | Acetron ®
Polyacetal [POM]
Quadrant Engineering Plastic Products offers both homopolymer and copolymer grades of Ertacetal including
an enhanced bearing grade material.
Main Characteristics
High mechanical strength, stiffness and hardness
Excellent resilience
Good creep resistance
High impact strength, even at low temperatures
Very good dimensional stability [low water absorption]
Good sliding properties and wear resistance
Excellent machinability
Good electrical insulating and dielectric properties
Physiologically inert [several grades have a food contact compliant composition]
Not self-extinguishing
Applications
Gear wheels with small modulus, cams, heavily loaded bearings and rollers, bearings and gears with small
clearances, valve seats, snapfi t assemblies, dimensionally stable precision parts, electrically insulating
components.
Grades
Ertacetal ® C [POM-C; natural (white)* / black / colours* - available as “Food Grade“, details see page 51]
Ertacetal C is Quadrant’s copolymer acetal grade. Next to the standard natural and black grades, there is
also a series of special colours available all showing an FDA food contact compliant composition. The acetal
copolymer is more resistant against hydrolysis, strong alkalis and thermaloxidative degradation than the
acetal homopolymer.
Ertacetal ® H [POM-H; natural (white) / black]
Ertacetal H is Quadrant’s homopolymer acetal grade. It offers a higher mechanical strength, stiffness, hardness
and creep resistance as well as a lower thermal expansion rate and often also a better wear resistance than
the acetal copolymer.
Ertacetal ® H-TF [POM-H + PTFE; deep brown]
Ertacetal H-TF is a DELRIN ® AF Blend, a combination of TEFLON ® fi bres evenly dispersed in a DELRIN acetal
resin. Much of the strength that is inherent in Ertacetal H is retained. Some properties change due to the
addition of TEFLON fi bre which is softer, less stiff and slipperier than virgin acetal resin. Compared with
Ertacetal C and H, this material offers superior sliding properties. Bearings made of Ertacetal H-TF show low
friction, long wear and are essentially free of stick-slip behaviour.
[*] See Food Contact Compliance Status on Page 51.
Tech Notes:
When it comes to outdoor applications Ertacetal is not
recommended because of its poor UV-resistance.
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