GB/T 3185-2016Zinc oxide(Indiect method) (English PDF)

1 Scope

This standard specifies the requirements, sampling, test methods, inspection rules, marking, packaging, transportation and storage of zinc oxide (indirect method).

This standard is applicable to zinc oxide prepared by indirect method.

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 601 Chemical Reagent - Preparations of Reference Titration Solutions

GB/T 602 Chemical Reagent - Preparations of Standard Solutions for Impurity

GB/T 603 Chemical Reagent - Preparations of Reagent Solutions for Use in Test Methods

GB/T 1864-2012 General Methods of Test for Pigments and Extenders - Comparison of Colour of Pigments

GB/T 3186 Paints, Varnishes and Raw Materials for Paints and Varnishes - Sampling

GB/T 5211.2-2003 Determination of Water-soluble Matter of Pigments - Hot Extraction Method

GB/T 5211.3-1985 Determination of Matter Volatile of Pigments at 105 Centigrade

GB/T 5211.15-2014 General Methods of Test for Pigments and Extenders - Part 15: Determination of Oil Absorption Value

GB/T 5211.16-2007 Comparison of Lightening Power of White Pigments

GB/T 5211.18-2015 General Methods of Test for Pigments and Extenders - Part 18: Determination of Residue on Sieve - Water Method (Manual Procedure)

GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods

GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values

GB/T 9723-2007 Chemical Reagent - General Rule for Flame Atomic Absorption Spectrometric Analysis

GB/T 19587-2004 Determination of the Specific Surface Area of Solids by Gas Adsorption Using the BET Method

3 Molecular Formula and Relative Molecular Mass

Molecular formula: ZnO

Relative molecular mass: 81.38 (as per IUPAC 2010 standard atomic weights)

4 Requirements

The products shall meet those specified in Table 1.

Table 1 Requirements

Item Index

Type I Type II Type III Appearance White powder

Zinc oxide content (dried products), w/% >= 99.70 99.70 99.50

Metal content (calculated in Zn), w/% <= None None 0.008

HCl insolubles, w/% <= 0.006 0.008 0.03

Calcination loss, w/% <= 0.20 0.20 0.25

Sieve residues (45 µm test sieve), w/% <= 0.10 0.15 0.20

Water solubles, w/% <= 0.10 0.10 0.15

105°C volatile matter, w/% <= 0.3 0.4 0.5

Plumbum (Pb) content, w/% <= 0.008 0 0.05 0.10

Copper (Cu) content, w/% <= 0.000 2 0.000 4 0.000 7

Manganese (Mn) content, w/% <= 0.000 1 0.000 1 0.000 3

Cadmium (Cd) content, w/% <= 0.002 0 0.005 0 0.010

Iron (Fe) content, w/% <= 0.005 0 0.010

Special surface area (m2/g) Agreed

Oil absorption a/(g/100 g) Agreed

Colour a Agreed

Lightening powera Agreed a For zinc oxide (indirect method) products used for pigment only.

5 Sampling

Product sampling shall be conducted according to the requirements of GB/T 3186 or the agreed method. The sampling quantity shall be determined as required by inspection.

6 Test Methods

Caution: Some of the reagents used in the test method are corrosive and must be handled with care! If necessary, conduct the test in a fume cupboard. If it is splashed on the skin, rinse it immediately with water. If it is serious, seek medical care immediately.