標準號：DIN ISO 48-2009
中文標準名稱：硫化或熱塑橡膠.硬度的測定(硬度在10 IRHD至100 IRHD之間)(ISO 48:2007),DIN ISO 48:2009-10的英文版本
英文標準名稱：Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD) (ISO 48:2007);English version of DIN ISO 48:2009-10
標準類型：G35
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G35
國際標準分類號：83.060
引用標準：ISO 18898;ISO 23529
適用范圍：1.1 GeneralThis International Standard specifies four methods for the determination of the hardness of vulcanized orthermoplastic rubbers on flat surfaces (standard-hardness methods) and four methods for the determination ofthe apparent hardness of curved surfaces (apparent-hardness methods). The hardness is expressed ininternational rubber hardness degrees (IRHD). The methods cover the hardness range from 10 IRHD to100 IRHD.The methods differ primarily in the diameter of the indenting ball and the magnitude of the indenting force,these being chosen to suit the particular application. The range of applicability of each method is indicated inFigure 1.The determination of hardness by a pocket hardness meter is described in ISO 7619-2.1.2 Standard-hardness methodsMethod N: Normal test -- This method is appropriate for rubbers with a hardness in the range 35 IRHD to85 IRHD, but may also be used for hardnesses in the range 30 IRHD to 95 IRHD.Method H: High-hardness test -- This method is appropriate for rubbers with a hardness in the range 85 IRHDto 100 IRHD.Method L: Low-hardness test -- This method is appropriate for rubbers with a hardness in the range 10 IRHDto 35 IRHD.Method M: Microtest -- This method is essentially a scaled-down version of the normal test method N,permitting the testing of thinner and smaller test pieces. It is appropriate for rubbers with a hardness in therange 35 IRHD to 85 IRHD, but may also be used for hardnesses in the range 30 IRHD to 95 IRHDNOTE 1 The value of the hardness obtained by method N within the ranges from 85 IRHD to 95 IRHD and from30 IRHD to 35 IRHD may not agree precisely with that obtained using method H or method L, respectively. The differenceis not normally significant for technical purposes.NOTE 2 Because of various surface effects in the rubber and the possibility of slight surface roughness (produced, for example, by buffing), the microtest may not always give results agreeing with those obtained by the normal test.1.3 Apparent-hardness methodsAlso specified are four methods. CN CH. CL and CM, for the determination of the apparent hardness ofcurved surfaces. These methods are modifications of methods N, H, L and M. respectively, for cases wherethe rubber surface tested is curved. Two cases exist, depending whethera) the test piece or product tested is large enough for the hardness instrument to rest upon it;b) it is small enough for both the test piece and the instrument to rest upon a common support.A variant of b) would be where the test piece rests on the specimen table of the instrumentApparent hardness can also be measured an non-standard flat test pieces usJng methods N, H, L and M.The procedures described cannot provide for all possible shapes and dimensions of test piece, but coversome of the commonest types, such as O-ringsDetermination of the apparent hardness of rubber-covered rollers is dealt with separately in the various partsof ISO 7267