ISO 2471:2008 PDF

Name: ISO 2471:2008 — Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method
SKU: ISO 2471:2008
Price: 25 EUR
Availability: InStock

Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method

Название (английский):

ISO 2471:2008

Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 3 декабря 2008 г.
Издание:: ISO IS 2471 edition 4 version 1
ICS:: 85.060

Тип поставки:

Full version195 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:3 раб. дн. (перевод)

Цена:195 €

Описание (английский):

ISO 2471:2008 specifies a method for the determination of the opacity (paper backing) of paper by diffuse reflectance. It can be used to determine the opacity of papers or boards which contain fluorescent whitening agents, provided the UV content of the radiation incident on the test piece has been adjusted to conform to that in the CIE illuminant C using a fluorescent reference standard provided by an ISO/TC 6 Authorized Laboratory as described in ISO 2470-1. ISO 2471:2008 is not applicable to coloured papers or boards which incorporate fluorescent dyes or pigments.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 2471:2008 specifies a standardized laboratory method for determining the opacity (paper backing) of paper and board by the diffuse reflectance technique. The method quantifies how well one sheet visually obscures printing on underlying sheets by measuring luminance factors under controlled illumination. It is applicable to papers and boards that contain fluorescent whitening agents provided the instrument UV output is adjusted to match the CIE illuminant C using an ISO/TC 6 fluorescent reference. It is not applicable to coloured papers or boards containing fluorescent dyes or pigments.

Key topics and requirements

Measurement principle: Opacity (%) = 100 × (single-sheet luminance factor R0) / (intrinsic luminance factor R∞).

Instruments: Use a calibrated reflectometer with geometric, spectral and photometric characteristics per ISO 2469 and capable of reporting luminance factor (C). Instruments must allow UV adjustment to UV(C) conditions for materials with fluorescent whitening agents.

Reference standards: Non‑fluorescent photometric standards and a fluorescent reference standard (for UV adjustment) supplied by an ISO/TC 6 authorized laboratory (per ISO 2470-1).

Test pieces and sampling:

Cut rectangular test pieces ≈ 75 mm × 150 mm.
Assemble a pad of at least 10 sheets (thick enough that doubling does not change R∞).
Mark orientation (top side) and measure both sides if necessary.

Procedure highlights:

Adjust UV content with fluorescent reference.
Measure intrinsic luminance factor of the pad (R∞) and single‑sheet luminance factor over a black cavity (R0).
Perform five paired measurements (alternate or grouped) and repeat for the opposite side.

Results & reporting:

Report mean opacity and standard deviation (or separate side values if difference > 0.2%).
Include instrument type, conditioning details, and any deviations from the standard.

Applications and users

Paper and board manufacturers: Quality control of opacity for newsprint, writing papers, coated board.

Printing and converting industries: Assess paper suitability to prevent show‑through and ensure print legibility.

Testing and certification laboratories: Routine conformance testing and interlaboratory comparison.

Instrument manufacturers: Design and calibrate reflectometers to meet ISO 2469/2471 spectral and UV requirements.

Buyers and specification writers: Define acceptance criteria for opacity in procurement contracts.

Related standards

ISO 2469 - Measurement of diffuse radiance (luminance) factor

ISO 2470-1 - Measurement of diffuse blue reflectance factor (ISO brightness) and UV adjustment procedures

ISO 186 - Sampling of paper and board

ISO 187 - Conditioning atmospheres for testing

Keywords: ISO 2471:2008, opacity determination, paper and board, diffuse reflectance, reflectometer, luminance factor, fluorescent whitening agents, CIE illuminant C, ISO 2469, ISO 2470-1.

ISO 2471:2008 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

BS ISO 24690:2025

Glass reinforced thermosetting plastic (GRP) pipes. Test method for the determination of long-term pressure e…

SIST ISO 2470-1:2017

Paper, board and pulps -- Measurement of diffuse blue reflectance factor -- Part 1: Indoor daylight condition…

BS ISO 18692-1:2026

Fibre ropes for offshore stationkeeping. General specification.

BS EN ISO 18771:2020

Anodizing of aluminium and its alloys. Method to test the surface abrasion resistance using glass-coated abra…