GB/T 2923-1995 in English

《GB/T 2923-1995黑白照相负片/加工组合ISO感光度的测定》由TC102（全国感光材料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
本标准规定了照相用黑白负片ISO感光度的测定。本标准适用于使用通用药品和设备加工的胶片，但也适用于特殊工艺加工的胶片，例如，使用活化剂显影或热显影。本标准不适用于电影摄影、航空摄影、制版印刷、射线摄影和显微摄影胶片，也不适用于扩散转移系统的负片。

Scope

This standard specifies the determination of the ISO sensitivity of black and white negative film for photography. This standard applies to films processed with conventional chemicals and equipment, but also to films processed by special processes, such as those developed with activators or thermally developed. This standard does not apply to cinematographic, aerial photography, lithography, radiography, and photomicrography films, nor to negatives for diffusion transfer systems.