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ACETAL (DELRIN®)
Delrin
(Homopolymer) is an acetal homopolymer made by DuPont. It is characterized
as having an excellent combination of physical properties that make it
suitable for numerous applications. With low moisture absorption and a
low coefficient of friction, Delrin is uniquely tailored for wear applications
in high humidity or moisture environments. Delrin will maintain constant
physical properties under high moisture conditions and out-perform nylon
in bearings under these conditions.
Alro Plastics offers these standard grades of Delrin: 150SA, and 550SA. The key properties are as follows:
- 550 SA The best machinability of all grades
- 150 SA Improved impact over 550SA
DELRIN AF is a combination of oriented Teflon TFE fluorocarbon fibers uniformly dispersed in Delrin acetal resin. This combination produces a material that has strength, toughness, dimensional stability and fabrication economy which approaches that of Delrin, plus the surface characteristics of unlubricated Teflon, the world's most slippery solid material.
DELRIN Glass-Filled stock shapes exhibit the basic Delrin properties plus high strength. Overall mechanical properties and dimensional stability are enhanced in this tough material. Specific property advantages include increased stiffness, better creep resistance and a higher dimensional stability. Parts designed using glass-filled will exhibit high fatigue endurance, low deformation under load and good impact resistance.
Acetal (Copolymer) is a tough, stable thermoplastic offering a unique combination of properties. Key properties include high modulus of elasticity, high strength, rigidity and dimensional stability. The material also exhibits a high natural lubricity, a wide useful temperature range and good electricals. Acetal has excellent resistance to moisture, gasolines, solvents and many other neutral chemicals. Acetal properties include low coefficient of friction, good bearing properties and a high resistance to repeated impacts.
Typical Properties
|
DELRIN
(Homopolymer):
|
DELRIN
AF:
|
DELRIN
GLASSED FILLED: |
ACETAL
(Copolymer): |
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|
|
|
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PROPERTY
TESTED
|
ASTM
|
UNITS
|
DELRIN
|
DELRIN
AF
|
ACETAL
|
|
PHYSICAL
|
.
|
.
|
.
|
.
|
|
| Tensile Strength |
D638
|
psi
|
10,000
|
7,600
|
8,800
|
| Elongation @ break |
D638
|
%
@ 73oF
|
75
|
22
|
75
|
| Tensile Impact |
D1822
|
ft•lbs/sq•in
|
170
|
50
|
90
|
| Compressive Strength |
D695
|
psi
@ yield
|
18,000
|
13,000
|
16,000
|
| Flexural Strength |
D790
|
psi
|
14,300
|
10,500
|
13,000
|
| Impact Strength, Izod |
D256
|
ft•lbs/in
|
2.3
notch
|
1.2
|
1.6
notch
|
| Hardness, Rockwell |
D785
|
R-M
|
R120
|
R118
|
M78
|
| Deformation, Under Load 122oF, 2000 psi, 24 hrs |
D621
|
%
|
0.5
|
0.6
|
.
|
| Water Absorption, 24 hrs. |
D570
|
%
|
0.25
|
0.20
|
0.22
|
|
THERMAL
|
.
|
.
|
.
|
.
|
|
| Thermal Conductivity |
C177
|
BTU/hr/sq•ftoF/in
|
2.6
|
.
|
.
|
| Thermal Expansion |
D696
|
in/oF/in
|
6.3
x 10-5
|
6.3
x 10-5
|
4.7
x 10-5
|
| Heat
Deflection 66 psi 264 psi |
D648 D648 |
oF oF |
342 277 |
334 244 |
316 320 |
| Melting Point |
D789
|
oF
|
347
|
347
|
329
|
|
ELECTRICAL
|
.
|
.
|
.
|
.
|
|
| Dielectric Strength |
D149
|
V/mil
|
500
|
400
|
500
|
| Dielectric
Constant 100 kHz 103 kHz 106 kHz |
D150 D150 D150 |
.
|
3.7 3.7 3.7 |
3.1 3.1 3.1 |
3.7 3.7 3.7 |
| Dissipation
(power factor) 100 kHz 103 kHz 106 kHz |
D150 D150 D150 |
.
. |
0.005 |
0.009 |
0.0010 0.0010 0.006 |
Product Applications
|
DELRIN
(Homopolymer):
|
DELRIN
AF:
|
DELRIN
GLASS FILLED |
ACETAL
(Copolymer): |
|
|
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