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POM WR140LG 抗紫外线,耐气候

添加时间:2013-06-18  信息来源:http://www.simibc.com/  作者:苏州希普能塑料
hostaform pom WR140LG
 
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
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