BS ISO 473 pdf free download
BS ISO 473-2019 pdf free download.Lithopone pigments — General requirements and methods of testing.
This document specifies the requirements and the corresponding test methods for three types of lithopone pigments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
ISO 385, Laboratory glassware — Burettes
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 787-1, General methods of test for pigments and extenders — Part 1: Comparison of colour of pigments
ISO 787-2, General methods of test for pigments and extenders — Part 2: Determination of matter volatile at 105 °C
ISO 787-3, General methods of test for pigments and extenders — Part 3: Determination of matter soluble in water — Hot extraction method
ISO 787-4, General methods of test for pigments and extenders — Part 4: Determination of acidity or alkalinity of the aqueous extract
ISO 787-5, General methods of test for pigments and extenders — Part 5: Determination of oil absorption value
ISO 787-7, General methods of test for pigments and extenders — Part 7: Determination of residue on sieve — Water method — Manual procedure
ISO 787-17, General methods of test for pigments and extenders — Comparison of lightening power of white pigments
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
ISO 18451-1, Pigments, dyestuffs and extenders — Terminology — Part 1: General terms
ISO 18451-2, Pigments, dyestuffs and extenders — Terminology — Part 2: Classification of colouring materials according to colouristic and chemical aspects
6 Sampling
Take a representative sample of the product to be tested, as described in ISO 15528.
7 Determination of barium sulfate and total zinc content
7.1 General
Two methods of test, Method A and Method B, are provided for the determination of the total zinc content. Method A shall be referred to in cases of dispute.
7.2 Method A
7.2.1 Principle
Dissolve the zinc sulphide (ZnS) and zinc oxide (ZnO) in the sample with hydrochloric acid. Add sulphuric acid to maintain a certain acidity (pH 1,5 to pH 3,0). Separate the solid from the liquid. Use the weight method to determine the content of the barium sulfate. Use diphenylamine as indicator and potassium hexacyanoferrate(II) as titrant to determine the total zinc content.
7.2.2 Reagents
During the analysis, use only reagents of recognized analytical grade and water of at least grade 3
purity according to ISO 3696.
7.2.2.1 Hydrochloric acid, concentrated, approximately 37 % (mass fraction),
ρ approximately 1,19 g/ml.
7.2.2.2 Hydrochloric acid solution, diluted 1 + 2.
Add 1 part by volume of concentrated hydrochloric acid (7.2.2.1) to 2 parts by volume of water.
7.2.2.3 Sulphuric acid, concentrated, approximately 96 % (mass fraction), ρ approximately 1,84 g/ml.
7.2.2.4 Sulphuric acid solution, diluted 1 + 8.
Add carefully 1 part by volume of concentrated sulphuric acid (7.2.2.3) to 8 parts by volume of water.
7.2.2.5 Ammonia, concentrated, ρ approximately 0,9 g/ml.
7.2.2.6 Ammonia solution, diluted 1 + 3.
Add 1 part by volume of concentrated ammonia (7.2.2.5) to 3 parts by volume of water.
7.2.2.7 Diphenylamine, 50 g/l ethanolic solution.
7.2.2.8 Congo red paper.
7.2.2.9 Lead acetate paper.
7.2.2.10 Zinc chloride, standard reference solution, containing approximately 5 g of zinc per litre (concentration c, in grams of zinc per millilitre).BS ISO 473 pdf download.
