佳 盼 塑 胶
JIA PAN SU JIAO
/ Product details
/ classification
POM WR140LG 抗紫外线,耐气候,光泽低
HOSTAFORM® WR140LG CD34682 BLACK
HOSTAFORM WR140LG | POM | UV Resistant
Description
Hostaform® acetal copolymer grade WR140LG Black is a specialty weatherable grade of acetal copolymer formulated to provide good flow with a low gloss finish and a UV stability necessary for exterior automotive applications.
Other Processing
Injection Molding
Standard reciprocating screw injection molding machines with a high compression screw (minimum 3:1 and preferably 4:1) and low back pressure (0.35 Mpa/50 PSI) are favored. Using a low compression screw (I.E. general purpose 2:1 compression ratio) can result in unmelted particles and poor melt homogeneity. Using a high back pressure to make up for a low compression ratio may lead to excessive shear heating and deterioration of the material.
Melt Temperature: Preferred range 182-199℃ (360-390℉). Melt temperature should never exceed 230℃ (450℉).Mold Surface Temperature: Preferred range 82-93℃ (180-200℉) especially with wall thickness less than 1.5 mm (0.060 in.). May require mold temperature as high as 120℃ (250℉) to reproduce mold surface or to assure minimal molded in stress. Wall thickness greater than 3mm (1/8 in.) may use a cooler (65℃/150℉) mold surface temperature and wall thickness over 6mm (1/4 in.) may use a cold mold surface down to 25℃ (80℉). In general, mold surface temperatures lower than 82℃ (180℉) may hinder weld line formation and produce a hazy surface or a surface with flow lines, pits and other included defects that can hinder part performance.
|
ISO Data |
Mechanical properties |
Value |
Unit |
Test Standard |
|
Phys |
Density |
1330 |
kg/m³ |
ISO 1183 |
|
Melt volume rate (MVR) |
13 |
cm³/10min |
ISO 1133 |
|
|
MVR test temperature |
190 |
℃ |
ISO 1133 |
|
|
MVR test load |
2.16 |
kg |
ISO 1133 |
|
|
Mold shrinkage - parallel |
1.6 |
% |
ISO 294-4 |
|
|
Mold shrinkage - normal |
1.5 |
% |
ISO 294-4 |
|
|
Mech |
Mechanical properties |
Value |
Unit |
Test Standard |
|
Tensile modulus (1mm/min) |
1800 |
MPa |
ISO 527-2/1A |
|
|
Tensile stress at yield (50mm/min) |
41 |
MPa |
ISO 527-2/1A |
|
|
Tensile strain at yield (50mm/min) |
10 |
% |
ISO 527-2/1A |
|
|
Flexural modulus (23℃) |
1850 |
MPa |
ISO 178 |
|
|
Charpy notched impact strength @ 23℃ |
3.6 |
kJ/m² |
ISO 179/1eA |
|
|
Charpy notched impact strength @ -30℃ |
3.6 |
kJ/m² |
ISO 179/1eA |
|
|
Therm |
Thermal properties |
Value |
Unit |
Test Standard |
|
Melting temperature (10℃/min) |
165 |
℃ |
ISO 11357-1,-2,-3 |
|
|
DTUL @ 1.8 MPa |
80 |
℃ |
ISO 75-1/-2 |
|
|
Coeff.of linear therm. expansion (parallel) |
1.3 |
E-4/℃ |
ISO 11359-2 |
|
|
Coeff.of linear therm. expansion (normal) |
1.3 |
E-4/℃ |
ISO 11359-2 |
|
|
SpecProd |
Test specimen production |
Value |
Unit |
Test Standard |
|
Processing conditions acc. ISO |
9988-2 |
- |
Internal |
Processing
Pre Drying
Predrying is required before processing to ensure a low gloss finish. Use slow injection speed until material passes through gate, then increase.
Drying time (h)：3
Drying temperature (℃)：105 - 110
