nit指標(biāo)result硬度（紹爾A型）hardness度70±5扯斷強(qiáng)度breaking strengthMPa＞10扯斷伸長率ratio of breaking at elongation%＞150壓縮永久變形（熱空氣200℃×22h）reshaped by compressing(hot gas 200℃×22h)壓縮率20% radio of compressing 20%%≤50熱空氣老化（200℃×24h）hot gas aging(200℃×24h)硬度變化 changes of hardness扯斷強(qiáng)度變化changes of breaking strengh扯斷伸長率變化 changes of ratio of breaking at elongation度%%≤010≤-20≤-30耐液體（150℃×24h）fluid ressistant (150℃×24h)一號(hào)標(biāo)準(zhǔn)油體積變化 chan