Polyacetal (POM)

Polyacetal (POM) is one of the 5 kinds general engineering plastics, the full name Polyoxymethylene or polyacetal, it is high degree of crystallinity polymer, besides the high hardness, strength and rigidity modulus, it has others excellent physical properties compare to other general plastics, 1. High mechanical hardness; 2. Excellent fatigue resistivity; 3. High creep resistance, excellent rebound resilience; 4. High antifriction and anti-abrasion, used for high friction machine parts; 5. it can be processed among wide temperature range; 6. High dimension stability, hard to change according to the temperature 7. Its flow is good, easy to mold, surface gloss. GradeBS025BS090BS130BS270BS350BS450Technical item UnitTest method Melt Index g/10minD1238 2.5913273545Gravity g/cm3D792 1.411.411.411.411.411.41Rockwell hardness M scaleD785 788080808080R scale -115----Bending strength Kgf/cm2D790 950950950 950 950 950 Bending modulus D790 26.0026.0026.00 26.00 26.00 26.00 Tensile Strength (Yield point) Kgf/cm2D638 610620620 620 620 620 Elongation (Breaking point) %D638 756055454035Compressive Strength 1%deformation Kgf/cm2D695 320320320 320 320 320 10%deformation Kgf/cm2D695 1,1001,1001,100 1,100 1,100 1,100 Impact strength (Concave 23 oC 50% RH) Kgf/cmD256 7.66.565.45.14.5Water absorption (In 23 oC water 24 hrs) %D570 0.220.220.22 0.22 0.22 0.22 Deflection temperature under load(18.6Kgf/cm2) oCD648 110110110110110110Shrinkage for molding %1.8-2.2 1.8-2.2 1.8-2.21.8-2.2 1.8-2.2 1.8-2.2 1.8-2.2