ISO 1249:1974 PDF

Name: ISO 1249:1974 — Zinc chromate pigments — Basic zinc potassium chromate pigments and zinc tetrahydroxychromate pigments
SKU: ISO 1249:1974
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Zinc chromate pigments — Basic zinc potassium chromate pigments and zinc tetrahydroxychromate pigments

Название (английский):

ISO 1249:1974

Zinc chromate pigments — Basic zinc potassium chromate pigments and zinc tetrahydroxychromate pigments

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 1 сентября 1974 г.
Издание:: ISO IS 1249 edition 1 version 1
ICS:: 87.060.10

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Описание (английский):

Specifies the requirements and corresponding test methods. The pigments are suitable for use in paints and/or corrosion-inhibiting coatings. Three types of pigments are distinguished. In one typ only a lead content up 2 % maximum is alloqwed. Replaces ISO Recommendation R 1249-1970.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 1249:1974 specifies requirements and corresponding test methods for zinc chromate pigments - specifically basic zinc potassium chromate (types la and lb) and zinc tetrahydroxychromate (type 2). The standard covers pigment composition, permitted impurities (including a permitted lead content up to 2% PbO in one lead-containing type), sampling and a series of analytical tests. These pigments are intended for use in paints and corrosion‑inhibiting coatings. ISO 1249 replaces ISO Recommendation R 1249‑1970.

Key topics and technical requirements

Pigment types defined

Basic zinc potassium chromate (types la and lb - type lb may contain up to 2% PbO)
Zinc tetrahydroxychromate (type 2)

Composition and purity limits (selected requirements from the standard)

Chromate (Cr2O3) content: minimum specified for basic zinc potassium chromates; type 2 has a lower specified range.
Alkali metal (K2O): maximum content specified.
Water‑soluble ions: sulphate, chloride and nitrate - maximum 0.1% (m/m) each.
Matter soluble in water: maximum 0.3% (m/m).
Matter insoluble in ammoniacal ammonium chloride: specified limits differ by type (e.g., higher allowable for lead‑containing type).
Residue on 63 μm sieve, volatile matter at 105 °C, and oil absorption: specified limits/tolerances (e.g., oil absorption within ±15% of agreed sample value).

Analytical/test methods

Sampling per ISO 842.
Chemical and physical tests referenced to ISO 787 (General methods of test for pigments) and included titrimetric and gravimetric procedures (e.g., iodometric/sodium thiosulphate titrations for chromate determination, water‑extract analyses for soluble ions).

Reporting precision

Results are reported to specified decimal places depending on the test (e.g., one or two decimal places).

Applications

Formulation and quality control of anticorrosive primers, industrial coatings and metal‑protective paints using zinc chromate pigments.

Specification and acceptance criteria for pigment suppliers and paint manufacturers.

Use in corrosion‑inhibiting coatings where chromate pigments are selected for passivation and rust‑inhibiting properties.

Related standards

ISO 787 - General methods of test for pigments (referenced test procedures)

ISO 842 - Sampling of raw materials for paints and varnishes

ISO 1249 (1974) replaces ISO Recommendation R 1249‑1970

Keywords: ISO 1249, zinc chromate pigments, basic zinc potassium chromate, zinc tetrahydroxychromate, corrosion‑inhibiting coatings, paint pigments, test methods, ISO 787, ISO 842.

ISO 1249:1974 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who uses this standard

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