Monday, September 14, 2015


Acetal Copolymer Thrust Washers ::

Acetal Copolymer has a good combination of properties, including low moisture absorption, good dimensional stability, and low friction, making it suitable for Bearing applications. We offer the range in varied sizes and dimensions as specified by clients. Our entire range is value for money.


Features :
  • Good sliding properties
  • Good temperature range
  • Lightweight
  • No maintenance
  • Very good dimensional stability
  • High impact strength
  • Good chemical resistance (4<pH<13)
  • Excellent resilience
  • Ideal for food industry

Technical Specifications
Property
ASTM Methods
Units
ACETAL Copolymer
Colour
-
-
White
Specific Gravity
D792
-
1.41
Water Absorption
Saturation in water

-
%
0.85
Tensile Strength
D638
N/mm2
70
Tensile Modulus
D638
N/mm2
3000
Elongation
D638
%
30
Flexural Strength
D790
N/mm2
-
Flexural Modulus
D790
N/mm2
-
Impact - Izod Notched
D256
J/m
80
Hardness
Rockwell
Shore D

-
M86
Melt Point
D2117
°C
165
Max allowable service temp in air
for short periods
continuously for 20,000hrs



-
-



°C
°C



140
100


Linear thermal expansion coefficient
D696
K-1x10-5
12.5
Thermal Conductivity
C117
W/K.m
0.31
Flammability
UL
-
HB
Volume Resistivity
D257
Ohm.cm
1014
Dielectric Stength
D149
kV/mm
20
Coefficient of friction (dryVs steel)
Limiting PV (V= 0.1 m/s) unlubricated
  (V= 1.0 m/s) unlubricated   continuously lubricated



μ
N/mm²
N/mm² N/mm²


0.25-0.30
m/s 0.16
m/s 0.10 m/s 0.50


Maximum long term static load

N/mm²
22
Maximum velocity (sliding dry)

m/s
2
Outside applications - UV resistance
-
-
C/B
Acids - Strong (pH <3)
-
-
C
Alkalis - Strong (pH >11)
-
-
A
Chlorinated Hydrocarbons
-
-
A/B
Hot Water
-
-
A

A - No attack; B - Mild attack by absorption; C - Dimensional change due to absorption, D - Decomposition in short time.
PART CODE :: 20021138

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