GB/T 538-2018Boric acid for industrial use (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 538-2006 "Industrial Boric Acid", compared with GB/T 538-2006, except for editorial changes, the main technical changes The following is as follows.

--- Increased classification of industrial boric acid (see Chapter 4);

--- Adjusted the sulfate content index requirements for general industrial boric acid qualified products (see Chapter 5.2 of the 5.2, 2006 edition);

--- Removed the ammonia content indicator requirements for general industrial boric acid and the footnotes of the corresponding table (see Chapter 4 of the 2006 edition);

--- Added requirements for boric acid for the nuclear industry (see 5.3).

1 Scope

This standard specifies the technical requirements, test methods, inspection rules and marking, labeling, packaging, transportation and storage of industrial boric acid.

This standard applies to industrial boric acid. This product is mainly used in glass, enamel, chemical, building materials, nuclear industry and optical glass industries.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 191-2008 packaging storage and transportation icon

General rules for sampling GB/T 6678 chemical products

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

GB/T 12684-2018 Industrial boride analysis method

3 Molecular formula and relative molecular mass

Molecular formula. H3BO3.

Relative molecular mass. 61.83 (according to 2016 international relative atomic mass).

4 Classification

According to the use of industrial boric acid, it is divided into two categories.

---I is for general industrial use;

--- Class II is used in the nuclear industry.

5 Requirements

5.1 Appearance. Industrial boric acid should be white powdery crystal or scaly ribbon with three oblique axes.

5.2 Class I boric acid products shall be tested in accordance with the test methods specified in this standard in accordance with Table 1. […]