GB/T 28600-2012 in English

《GB/T 28600-2012橡胶配合剂 沉淀水合二氧化硅 平均孔径的测定》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC5（全国橡胶与橡胶制品标准化技术委员会炭黑分会）执行，主管部门为中国石油和化学工业联合会。

1 Scope

This standard specifies the analytical test method for determination of average pore diameter of silica by using mercury porosimeter.

This standard is applicable to precipitated hydrated silica.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 6003.1 Test sieves of metal wire cloth
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
HG/T 3061 Rubber compounding ingredients - Silica, precipitated, hydrated

3 Principle

An appropriate amount of specimen is degassed in a vacuum station and then immersed with mercury in a permeable filler through a high-pressure system, and the volume of mercury immersed may be recorded according to the applied pressure. The larger the external pressure is, the smaller the radius of the pore into which mercury can enter will be. The volume and average pore diameter of the corresponding pore can be known by measuring the volume of mercury entering the pore under different external pressures.

4 Reagents and materials

Mercury, with a content (mass fraction) of ≥99.995%.

Foreword I
1 Scope
2 Normative references
3 Principle
4 Reagents and materials
5 Apparatuses
6 Sampling
7 Analytical procedures
8 Result calculation
9 Test report