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压针长度对试验结果的影响
标准中规定邵尔A硬度计的压针露出加压面的高度为2.5mm,在自由状态时指针应指零点。当压针在平滑的金属板或玻璃上时,仪器指针应指100度,如果指示大于或小于100度时,说明压针露出高度大于或小于2.5mm或小于2.5mm,这种情况下应停止使用,进行校正。当压针露出高度大于2.5mm时测得的硬度值偏高。
1.2 压针端部形状对试验结果的影响
邵尔A型硬度计的压针端部在长期作用下,造成磨损,使其几何尺寸改变,影响试验结果,磨损后的端部直径变大所测得结果也大,这是因为其单位面积的压强不同所致。直径大则压强小所测得硬度值偏大,反之偏小。
产品说明Product description |
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·TO8400是一款高性能弹性体材料,具有优异的耐候、耐老化性能. TO8400 is a high performance elastomer material with excellent weather resistance and aging resistance. |
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关键特性Key characteristic |
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1.良好的低温抗冲击性Good low temperature resistance and impact resistance. 2.极好的回弹性和柔软性Excellent resilience and soft touch. 3.耐候性好,耐油,耐化学性Good weather resistance, oil resistance, chemical resistance |
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功能Function |
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产品应用 Main application |
电线电缆 |
体育器材Sports goods |
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家用电器Household appliances |
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加工方法Processing method |
挤出成型 |
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环保认证 Environmental certification |
ROHS |
REACH |
EN71-3 |
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PAHS |
ASTM-F963 |
Phthalate |
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颜色Color |
透明 |
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气味Smell |
少许树脂味A little resin smell |
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外型Appearance |
圆球形小颗粒Cylindrical particle,about 3mm×1.5mm |
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储藏期Storage period |
常温下通风干燥,12个月Ventilated dry at normal temperature,about 12 months |
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包装方式Packaging method |
25公斤/袋 25kg/bag |
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物理性能Physical properties |
结果Result |
单位Unit |
方法Method |
成型条件Molding condition |
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比重Specific gravity |
0.89±0.02 |
g/cm3 |
ASTM D792 |
干燥温度Drying temp |
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硬度Hardness |
83±3 |
shoreA |
ASTM D2240 |
干燥时间Drying time |
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拉伸强度Tensile strength |
>8 |
Mpa |
ASTM D412 |
射嘴温度Nozzle temp 190℃ |
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断裂延伸Elongation at break |
>500 |
% |
ASTM D412 |
螺筒一段温度Screw 1 temp 180℃ |
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撕裂强度Tearing strength |
>30 |
Kn/m |
ASTM D624 |
螺筒二段温度Screw 2 temp 170℃ |
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熔融指数Melt index |
>6 |
g/10min |
ASTM D1238 |
螺筒三段温度Screw 3 temp 160℃ |
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