POM K300可隆--Kocetal K300 is a general injection molding gradewith a good mechanical property for wide range
Specific gravity 1.41 g/cm ASTM D792 melt flow rate (190 C/2.16kg) 9.0 g/10 min ASTM D1238 shrinkage-flow 2.0% ASTM D955 waterabsorption rate (e, 23 C, 60% RH) 0.22% ASTM D570hardness rating unit system test method Rockwell hardness (M level)80 ASTM D785 Mechanical Performance Rating Unit System Test MethodTensile Strength 64.0 MPa ASTM D638 Elongation (Yield, 23 degreesC) 60% ASTM D638 Bending Modulus (23 degrees C) 2500 MPa ASTM D790Bending Strength (23 degrees C) 94.0 MPa ASTM D790 ImpactPerformance Rating Unit System Test Method for Notched ImpactStrength (23 degrees C) 67 J/m A of Suspension Beams Thermaldeformation temperature ASTM D648 0.45 MPa, unannealed 158 degreesC ASTM D648 1.8 MPa, unannealed 110 degrees C ASTM D648 Vicatsoftening temperature 162 degrees C ASTM D1525 melting temperature1 166 degrees C ASTM D3418 linear thermal expansioncoefficient-flow 1.3E-4 cm/cm/degree C ASTM D696 under test loadElectrical Performance Rating Unit System Test Method SurfaceResistivity 1.0E+16 ohms ASTM D257 Volume Resistivity 1.0E+14ohms.cm ASTM D257 Dielectric Strength 19 kV/mm ASTM D149 DielectricConstant 3.70 ASTM D150 Dissipation Factor (1 MHz) 6.0E-3 ASTM D150Flammability Rating Unit System Test Method UL Flame RetardantClass HB UL 94
POM has a limit oxygen index of only 15%, which is a veryflammable plastic variety. As engineering plastics, POM is widelyused in automobile, electronics, electrical and building materials,which require high flame retardancy of materials. Due to the poorcompatibility of POM with other materials, it is difficult toprepare flame retardant POM with excellent properties by addingflame retardant directly. Asahikawa Industrial Co., Ltd. of Japanhas applied for a patent for a flame retardant polyformaldehydesuper-extender. The flame retardant polyformaldehydesuperelongation is prepared by coating vinylidene chloride polymerlatex on the superelongated polyformaldehyde or by mixing the latexwith metal oxides or hydroxides. 0.2-0.5 g per gram ofpolyformaldehyde was coated to obtain a continuous film with oxygenindex greater than 40 and flow temperature greater than 100 C.
