Shanghai Daoqin Plastics Co., Ltd.

一, front 言

hardness is thermoplastic property elastomer (TPE,TPR) basic parameters 之一. thermoplastic property elastomer belongs to soft property plastics, its most large features 之一就 is tool has can adjustment hardness （TPE,TPR hardness can in 0~100A adjustment ）. different hardness TPE(TPR), material 手感, strong/high degree, decrease and other property can different, 进而决定 TPE, TPR材 material applications. therefore, hardness, is TPE(TPR) most important most basic material property indicators 之一.

二, how to hardness

1, through OK样 sheet/plate testing hardness

客户 development new product, very more lower is has standards sheet/plate. 此时, hardness 确认, 自然以 standards sheet/plate is 准. use will standards sheet/plate to to supply testing 确认（ its this testing, mono mono is hardness, also has for material appearance, processing requirements and other understanding ）, supply according to 客户样 sheet/plate provide versus hardness and material property TPE,TPR材 material Sample.

2, through Data Sheet 确认材 material hardness

客户没 has sheet/plate, if can provide material material property parameters table/sheet, 则应以 material property related data 确认材 material hardness.

3, through material ratio for material hardness

客户知道做 what product, has sheet/plate, has Data Sheet. can large is what hardness （ ratio similar 橡皮筋, 婴儿奶 bottle hardness ）, 但客户 also Sample. this category of 情况, according to 客户 描述 large 致选一 types hardness material, let 客户 试, is 投石问路. one-time Sample hardness has 差异, good is again Sample provide material hardness ratio for 参照.

new product Sample, hardness basic according to above types methods can.

但实际 upper, 一 没 has OK样 sheet/plate new product 案例, in use material process in, has 时会反馈 hardness hard or soft. this can can is use provide material hardness value 不准确, or use front use is PVC, in use TPE, for hardness understanding has 误（ use can can 不明白PVC and TPE hardness table/sheet methods has 差异, or 者说PVC 60 degree 跟TPE 60 degree, hardness value is has 差异 ）.

三, hardness testing 结果偏差 analysis

1, Sample thick degree effect/influence

邵尔A type hardness value is pressure pressure Sample deep degree 测定, therefore Sample thick degree effect/influence experiment/testing 结果. Sample to pressure thick generate deformation, to pressure 部位变 thin, hardness value increase large. therefore, Sample thick degree small hardness value large, Sample thick degree large hardness value small.

2, pressure long degree for experiment/testing effect/influence

standards in 规定邵尔A hardness pressure 针露出 add pressure high degree is 2.5mm, in 自由状态时指针应指零点. pressure in slip metal sheet/plate or upper 时, device 指针应指100 degree, if large or small 于100 degree 时, pressure 针露出 high degree large or small 于2.5mm or small 于2.5mm, this type of lower 应停止 use, 进行校 positive. pressure 针露出 high degree large 于2.5mm时测 hardness value high.

3, pressure 针端部形状 for experiment/testing effect/influence

邵尔A type hardness pressure 针端部 in long function lower, formed abrasion loss, make its dimensions 改变, effect/influence experiment/testing 结果, abrasion loss rear 端部直径变 large 测 结果也 large, this is is its mono 位面积 pressure strong/high different 致. large pressure strong/high small hardness value 偏 large, 反之偏 small.

4, temperature degree for experiment/testing effect/influence

橡胶 is polymer/macromolecule material, its hardness value ring 境 变化而变化, temperature degree high hardness value reduce. material different its effect/influence degree different, crystallization speed degree slow 天然橡胶, temperature degree for its effect/influence small, chlorine 丁橡胶, 丁苯橡胶 and other effect/influence significantly. for thermoplastic property elastomer 而言, temperature degree effect/influence is relatively is significantly. usually in 夏天, 同一款 Model/Grade TPE,TPR材 material, ratio in need soft 5 degree (A) left right!

5, 读数 time effect/influence

邵尔A type hardness in amount 时读数 time for experiment/testing effect/influence very large. pressure and Sample pressure rear 立即读数 and stability rear again 读数, versus very large, front high, rear low, 二者之差 can 达5至7 degree left right, especially again combined formed testing in relatively is significantly, this main/primary is material in pressure rear generate creep 致. therefore Sample pressure rear 应立即读取 data.

4, summary

above is 说 一 常规TPE,TPR hardness tips/techniques and hardness testing analysis, for/regarding ultra- soft 0 degree (A) TPE,TPR材 material, let use provide OK样 sheet/plate 确认材 material hardness, for 0 degree type ultra- soft TPE而言, hardness degree, can can belt/tape full different and use 体验. if use in 声称 材 material hardness as is Sample material hardness standards, Sample product in very large degree upper and use 户实际 demand in 偏差.