3.1 In accordance with Specification D2227, shipments of TSR10 and TSR20 must meet a minimum initial Wallace plasticity (Po) of 30 to be accepted. However, even with this minimum restriction, the uncured viscoelastic or “processability” properties are allowed to vary greatly. This variation in properties can significantly affect the quality and efficiency of a factory operation.3.2 Bales of TSR10 or TSR20 which are lower in their uncured elastic quality (“soft” rubber) in some cases may impart better processing properties to tire innerliners, cushion gums, and sidewalls. “Soft” bales sometimes impart better building tack, better mold flow, and lower extrusion die swell with better dimensional stability. Also, these “soft” rubber bales may dissolve faster in solvents for adhesion dipping.3.3 Bales of TSR10 or TSR20 that are higher in their uncured elastic quality (“hard” rubber) in some cases generate greater shearing during the initial stages of a factory mix, which result in a faster breakdown and a shorter mix cycle.3.4 Therefore, in a factory operation, sometimes segregating TSR10 or TSR20 shipments into “soft” and “hard” categories can improve the efficiency and quality of a factory operation.1.1 This practice covers the sorting of natural rubber bales of TSR10 or TSR20 in the factory according to their predicted processing performance based on differences in viscoelastic properties.1.2 This practice determines which bales should be used in factory compounds which benefit from using “soft” natural rubber versus which work better with “hard” natural rubber.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

This specification covers bale coatings on rubber bales made from natural sources. This is not applicable to natural rubbers packaged with plastic wrappers. Samples for testing should be carefully collected at random from the outside of the wrapper sheets from any three sides of the bale and properly handled and stored. Test methods include an ashing procedure to determine the amount of mineral filler from the bale coating on the wrapper sheets. A brushing or scraping procedure is also detailed for determining the amount of bale coating in the outside of the wrapper sheets of smoked sheet rubbers only.1.1 This specification covers bale coating on bales of natural rubber (that have rubber wrapper sheets on the bales) and includes test method description. It specifies the maximum permissible amount of such coating.1.2 This specification is not applicable to natural rubber that is packaged with plastic wrappers, as no bale coating is used.1.3 The following safety hazards caveat pertains only to the test method portion, Section 5, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车