GB/T 18012-2008 in English

《GB/T 18012-2008天然胶乳 pH值的测定》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC8（全国橡胶与橡胶制品标准化技术委员会天然橡胶分会）执行，主管部门为中国石油和化学工业联合会。
本标准于１９９９年１１月首次发布。本标准规定了采用装有玻璃和银参比电极的pH计进行天然胶乳pH值测定的方法。本标准也适用于预硫化胶乳或配合胶乳pH值的测定。 本标准根据ＩＳＯ９７６：１９９６及其修改单ＩＳＯ９７６／Ａｍｄ．１：２００６重新起草 本标准与ＧＢ／Ｔ１８０１２―１９９９相比，主要差异如下：
―――增加第８章：精密度说明；
―――原第８章改为第９章；
―――删去附录Ａ：试验方法的精密度。

Scope

WARNING: Personnel using this standard should have practical experience in a formal laboratory. This standard does not address all possible safety issues. It is the user's responsibility to take appropriate safety and health measures and ensure compliance with the conditions stipulated in the relevant national laws and regulations. This standard specifies the method for the determination of the pH value of natural rubber latex using a pH meter equipped with a glass and silver reference electrode. This standard is also applicable to the determination of the pH value of pre-vulcanized latex or compound latex.