IS 14661 : Part 3 : Sec 5 : 2025/ISO 12625-7 : 2021 Tissue Paper and Tissue Products - Part 3 Methods of Test - Section 5 Determination of Optical Properties - Measurement of Brightness and Colour with D65/10° (Outdoor Daylight)
NATIONAL FOREWORD
This Indian Standard (Part 3/Sec 5) which is identical to ISO 12625-7 : 2021 'Tissue paper and tissue products - Part 7: Determination of optical properties - Measurement of brightness and colour with D65/10° (outdoor daylight)' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Paper and its Products Sectional Committee and approval of the Chemical Division Council.
Brightness and colour measurement can be performed under various illumination and observation conditions. Optical measurement is affected by the geometry of the instruments used and by the texture of the material. The optical properties are related to the visual appearance of the material. Therefore, although optical properties are intrinsic properties of tissue paper, they are not functional properties.
This Indian Standard deals with D65/10° conditions, which pertain to outdoor daylight. A separate standard is under development for C/2° conditions (indoor daylight).
ISO has published standards for vocabulary and methods of test for tissue paper and tissue products under the ISO 12625 series of standards. To align with international best practices and ensure consistency within the Indian context, the concerned sectional committee of BIS decided to harmonize the vocabulary and methods of test of tissue paper and tissue products with those published by ISO.
The Committee also decided to publish all the concerned standards under IS 14661 series, with its parts addressing specific aspects of tissue paper and tissue products as given below:
Part 1 Vocabulary
Part 2 Specification
Part 3 Methods of test
Part 3 of IS 14661 series is further subdivided into several sections, each addressing methods of test for specific parameters.
This Section of IS 14661 (Part 3) specifies testing procedures for the instrumental determination of brightness and colour of tissue paper and tissue products viewed under outdoor daylight conditions. It also provides specific instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical measurements of products. Other sections of IS 14661 (Part 3) are:
Sec 1 Determination of thickness, bulking thickness and apparent bulk density and bulk
Sec 2 Determination of tensile strength, stretch at maximum force and tensile energy absorption
Sec 3 Determination of wet tensile strength
Sec 4 Determination of grammage
Sec 6 Water-absorption time and water-absorption capacity, basket-immersion test method
Sec 7 Determination of disintegration in water
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations.Certain conventions and terminologies are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.