EN ISO 20266:2020 PDF

Paints and varnishes - Determination of image clarity (degree of sharpness of reflected or transmitted image) (ISO 20266:2018)

Название (английский):

EN ISO 20266:2020

Paints and varnishes - Determination of image clarity (degree of sharpness of reflected or transmitted image) (ISO 20266:2018)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 19
Дата публикации:: 9 декабря 2020 г.
Издание:: CEN EN 20266 edition 1 version 1
ICS:: 87.040

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Описание (английский):

This document specifies an instrumental method for determining the image clarity on paint films (coatings) by measuring reflection from the specimen surface or transmission through the specimen. The method can be applied only to a flat surface.

Технические детали

Технический комитет: CEN/TC 139 - Paints and varnishes
SKU: EN ISO 20266:2020

Abstract

Overview

EN ISO 20266:2020 (ISO 20266:2018) specifies an instrumental method for determining the image clarity - the degree of sharpness of a reflected or transmitted image - of paint films and coatings. The method measures how clearly an image is reproduced when reflected from or transmitted through a coated, flat surface. Image clarity is defined and reported as a percentage and is distinct from gloss or haze measurements.

Key topics and requirements

Scope & limitation
- Applies only to flat surfaces of coated test specimens.
- Results are sensitive to temperature and humidity; conditioning requirements must be met or reported.
Principle
- A narrow light source (slit) produces a collimated beam; the image reflected or transmitted is focused through an optical mask and detected. Signal processing yields the image clarity value.
Apparatus
- Required components include a lamp, slit, collimating/de-collimating lenses, optical mask, light receptor and a black glass standard per ISO 17221.
Specimen preparation & conditioning
- Sample preparation follows ISO 1513 and ISO 1514 guidance.
- Condition coated specimens at (23 ± 2) °C and (50 ± 5) % RH for at least 16 h, unless otherwise agreed.
- Typical specimen size: 30 × 30 mm to 150 × 150 mm, thickness

Overview

Key topics and requirements

Scope & limitation
- Applies only to flat surfaces of coated test specimens.
- Results are sensitive to temperature and humidity; conditioning requirements must be met or reported.
Principle
- A narrow light source (slit) produces a collimated beam; the image reflected or transmitted is focused through an optical mask and detected. Signal processing yields the image clarity value.
Apparatus
- Required components include a lamp, slit, collimating/de-collimating lenses, optical mask, light receptor and a black glass standard per ISO 17221.
Specimen preparation & conditioning
- Sample preparation follows ISO 1513 and ISO 1514 guidance.
- Condition coated specimens at (23 ± 2) °C and (50 ± 5) % RH for at least 16 h, unless otherwise agreed.
- Typical specimen size: 30 × 30 mm to 150 × 150 mm, thickness

EN ISO 20266:2020 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

Overview

Key topics and requirements

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