SIST EN ISO 787-22:2018 PDF

Name: SIST EN ISO 787-22:2018 — General methods of test for pigments and extenders - Part 22: Comparison of resistance to bleeding of pigments (ISO 787-22:1980)
SKU: SIST EN ISO 787-22:2018
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General methods of test for pigments and extenders - Part 22: Comparison of resistance to bleeding of pigments (ISO 787-22:1980)

Название (английский):

SIST EN ISO 787-22:2018

General methods of test for pigments and extenders - Part 22: Comparison of resistance to bleeding of pigments (ISO 787-22:1980)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 11 декабря 2017 г.
ICS:: 87.060.10
Технический комитет:: PIP - Pigments and extenders

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Описание (английский):

Specifies a method for comparing the resistance to bleeding with that of an agreed sample. The method has been established because it is essentially a practical test and as such is probably of greater general value than other methods.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - EN ISO 787-22:2017 (ISO 787-22:1980)

EN ISO 787-22:2017 specifies a practical comparative test method to evaluate the resistance to bleeding of pigments used in paints and coatings. The method compares a test pigment against an agreed reference sample by applying pigment dispersions to test panels, overcoating with a white composition, and assessing any discoloration (bleeding) visually or instrumentally. This part of the ISO 787 series is intended as a general, broadly applicable procedure for pigments and extenders.

Key topics and technical requirements

Purpose: Compare bleeding of a pigment under agreed conditions with a reference (agreed) sample. The standard emphasizes a practical, visual comparison rather than purely solvent-solubility tests.

Sampling: Representative sampling as per ISO 842.

Test materials:

Metal or equivalent test panels (e.g., bright tinplate or aluminium), typically 150 mm x 100 mm.
Agreed medium for pigment dispersion and an agreed white overcoating composition.
Optional abrasion using silicon carbide paper grade 600 and black-and-white charts for evaluation.

Application details:

Prepare dispersions of the test pigment and the agreed sample in the same medium.
Apply dispersion to two-thirds of panel length to a wet film thickness of 75–120 µm; leave one end uncoated.
Apply the white overcoating so panels have areas coated only with overcoat, only with pigment dispersion + overcoat, and over a black-and-white chart.
Dry at ambient or subject to agreed stoving conditions.

Assessment and reporting:

Compare in diffuse daylight (or artificial daylight) following ISO 3668; repeat after 24 hours.
Results expressed as bleeding less than, equal to, or greater than the agreed sample.
Test report must include pigment ID, reference to ISO 787-22, agreed test conditions, daylight type, result, deviations and date.

Practical applications and users

Who uses this standard:

Pigment manufacturers and suppliers (quality control and product comparison)
Paint, varnish and coatings formulators (compatibility and formulation stability)
Coatings test laboratories and certification bodies
R&D teams assessing pigment migration and staining risks

Typical applications:

Routine QC checks to confirm new batches match reference bleeding performance
Comparative assessments during pigment selection for sensitive topcoats
Supplier-to-customer acceptance tests where an “agreed sample” is used

Related standards

ISO 787 series - general methods for pigments and extenders (other parts cover colour, density, lightfastness, etc.)

ISO 842 - Sampling of raw materials for paints and varnishes

ISO 3668 - Visual comparison of paint colour (used for assessment)

Keywords: EN ISO 787-22:2017, ISO 787-22, resistance to bleeding, pigments, extenders, pigment bleeding test, paint testing, coatings quality control.

SIST EN ISO 787-22:2018 PDF

Abstract

Похожие стандарты

Overview - EN ISO 787-22:2017 (ISO 787-22:1980)

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

ISO 787-22:1980

General methods of test for pigments and extenders — Part 22: Comparison of resistance to bleeding of pigments

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