 |
Acetal
Acetal or Polyoxymethylene (POM), in the USA also commonly known under DuPont's brand name Delrin, or Ticona's brandname Celcon. Acetal is often marketed and used as a metal substitute,
Acetals are lightweight, low-friction, and wear-resistant thermoplastics with good physical and processing properties and capable of operating in temperatures in excess of 90 degrees
Celsius (approx 200 degrees Fahrenheit).
Typical applications for injection-molded Acetal include high performance engineering components (e.g. gear wheels, ski bindings, fasteners, lock systems) and the material is widely used in the
automotive and consumer electronics industry. There are special grades that offer higher mechanical toughness, stiffness or low friction/ wear properties.
Acetal Specifications
|
C-Acetal 25GF |
C-Acetal 20PTFE |
H-Acetal 20PTFE |
C-Acetal 10MF |
H-Acetal 10MF |
| |
Description |
ASTM Test Method |
Co-polymer 25% Glass Filled |
Co-Polymer 20% PTFE |
Homopolymer 20% PTFE |
Co-polymer general purpose injection grade |
Hompolymer general purpose injection grade |
| Physical |
Melt Flow rate, g-10min |
D1238 |
|
|
|
10 |
10 |
|
Specific gravity |
D792 |
1.58 |
1.50 |
1.50 |
1.41 |
1.40 |
| |
Mold Shrinkage E-3 in/in |
D955 |
2-3 in/in |
1-2 in/in |
2-3 in/in |
2-3 in/in |
2-3 in/in |
|
Tensile Strength Break, PSI |
D638 |
11,500 |
6,000 |
6,200 |
8,000 |
9,500 |
|
Tensile Strength Yield, PSI |
D638 |
11,500 |
6,000 |
6,000 |
8,000 |
9,500 |
| Mechanical |
Flexural Strength, PSI |
D790 |
15,500 |
9,000 |
9,500 |
10,000 |
10,000 |
|
Flexural Modulus, PSI x 1000 |
D790 |
900 |
300 |
310 |
450 |
460 |
|
Notched Izod Impact strength ft-lb/in |
D256 |
0.8 |
0.8 |
0.8 |
0.8 |
1.2 |
| Thermal* |
HDT @66 PSI F |
D648 |
330 |
230 |
230 |
240 |
245 |
| |
HDT @264 PSI F |
D648 |
355 |
210 |
210 |
225 |
235 |
| Flammability |
UL 94 @1/16" |
UL94 |
HB |
V-0 |
HB |
HB |
HB |
| |
UL 94 @1/8" |
UL94 |
HB |
5VA |
HB |
HB |
HB |
|
Processing method***** |
|
IM |
IM |
IM |
IM |
IM |
|
Drying Temp F |
|
250 |
250 |
250 |
250 |
250 |
| Typical Processing Conditions Units |
drying Time(hours) |
|
3-4** |
3-4** |
3-4** |
3-4** |
3-4** |
|
Melt Temp (F) |
|
360-425 |
360-425 |
360-425 |
360-425 |
360-425 |
|
Mold temp(F) |
|
175-225 |
175-225 |
175-225 |
175-225 |
175-225 |
|
Front Zone(F) |
|
370-410 |
370-410 |
370-410 |
370-410 |
370-410 |
|
Middle Zone(F) |
|
360-400 |
360-400 |
360-400 |
360-400 |
360-400 |
| |
Rear Zone(F) |
|
350-390 |
350-390 |
350-390 |
350-390 |
350-390 |
|
* All mechanical and thermal testing conducted on 1/8 thick unpigmented test samples
|
|
(Structural foam grades tested with foamed parts,
with a 10-20% weight reduction.) |
|
** Do not exceed 8 hours |
|
*** Do not exceed 24 hours |
|
****Processing Methods: Injection molding(IM), Structural Foam(SF), Extrusion(E) |
|
(t)Notched Izod @ 40F, ft-lb/in. ASTM D256 |
|
|
