IS 1060 : Part 8 : Sec 1 : 2025/ISO 1762 : 2019 Methods of Sampling and Test for Paper and Allied Products - Part 8 Methods of Test for Paper, Board, Pulps and Cellulose Nanomaterials - Section 1 Determination of Residue (Ash Content) on Ignition at 525 °C
[Superseding IS 1060 (Part 4/Sec 2) : 2018]
NATIONAL FOREWORD
This Indian Standard (Part 8/Sec 1) which is identical to ISO 1762 : 2019 'Paper, board, pulps and cellulose nanomaterials - Determination of residue (ash content) on ignition at 525 °C' 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.
The magnitude of the residue (ash content) on ignition at a given temperature is related to, but not equal to, the content of mineral constituents in the sample of paper, board, pulp and cellulose nano-materials. In samples containing calcium carbonate, there is practically no decomposition of carbonate by ashing at 525 °C. Other fillers and pigments such as clay and titanium dioxide are also unaffected by ashing at 525 °C. Therefore, the residue on ignition at 525 °C provides a good estimate of the total inorganic matter in the sample, provided that the sample does not contain other minerals (such as magnesium carbonate and calcium sulfate) which decompose at or below this temperature.
Generally, as a preliminary step, determination of reside (ash content) on ignition at 525 °C of sample is carried out. Subsequently, for inorganic materials such as China Clay and calcium carbonate, the residue on ignition at 900 °C is determined. These determinations are used as screening test for checking the overall quality of products and determining particular mineral constituents.
This standard covers determination of residue (ash content) in samples of paper, board, pulp and cellulose nano-materials on ignition at 525 °C. A separate standard is being published for determination of residue (ash content) in these samples on ignition at 900 °C.
ISO has published test method standards related to paper, pulp and board under three broad categories namely 'Paper, board and pulps', 'Paper and board' and 'Pulps'. Related Indian Standards published in IS 1060 (Parts 1, 2 and 3) 'Methods of sampling and test for paper and allied products' and IS 6213 series of standards published for 'Methods of test for pulps' are widely recognized and used in India.
To maintain consistency with the prevailing international practices and to retain the existing test methods series, the committee responsible for formulating this standard decided to harmonize the methods of tests prescribed in IS 1060 series and IS 6213 series with those published by ISO and publish these adopted test methods standards in subsequent parts/sections of IS 1060 series or IS 6213 series.
Related Indian Standards on methods of test have been published in the following other parts of IS 1060 series on 'Methods of sampling and test for paper and allied products':
Part 4 Methods of test for paper, board and pulp
Part 5 Methods of test for paper and board
Part 6 Methods of test for paper
Part 7 Methods of test for board
Part 8 Methods of test for paper, board, pulps and cellulose nanomaterials
This standard is being published as Part 8 'Methods of test for paper, board, pulps and cellulose nanomaterials' of IS 1060 series. This Section of IS 1060 (Part 8) describes the determination of the residue (ash content) on ignition of paper, board, pulps and cellulose nanomaterials at 525 °C in all types of paper, board, pulp and cellulose nanomaterial samples. Other sections of IS 1060 (Part 8) that are being formulated are:
Sec 2 Determination of residue (ash content) on ignition at 900 °C
Sec 3 Determination of acid-soluble magnesium, calcium, manganese, iron, copper, sodium and potassium
Sec 4 Determination of dry matter content by oven-drying method - Materials in solid form
Sec 5 Determination of dry matter content by oven-drying method - Suspensions of cellulosic nanomaterials
This test method was first published as IS 6213 (Part 7) 'Methods of test for pulps: Part 7 Ash content in pulp' in 1971, prescribing the ignition temperature as (575 ± 25) °C and was intended for testing of pulps only. In 2018, the committee decided to revise the test method by adopting relevant ISO Standard i.e. ISO 1762 : 2015 which applied to paper, board and pulps, prescribing the ignition temperature as (525 ± 25) °C. As standards related to methods of test for paper, board and pulp were being published in the IS 1060 (Part 4) series, this test method was published as IS 1060 (Part 4/Sec 2) : 2018 'Methods of sampling and test for paper and allied products: Part 4 Methods of test for paper, board and pulps, Section 2 Determination of residue (ash) on ignition at 525 °C', superseding IS 6213 (Part 7) : 1971.
ISO has further revised the standard in 2019 expanding the title and scope to cover cellulose nanomaterials as well. Recognizing the benefits of following uniform practices globally, the committee has decided to adopt latest version of ISO 1762 and publish it as part of IS 1060 (Part 8) series, which provides methods of test for paper, board, pulp and cellulose nanomaterials, superseding IS 1060 (Part 4/Sec 2) : 2018.
The current ISO standard has the following modifications from its previous version:
a) Scope revised to cover cellulose nanomaterials instead of only paper, board and pulps;
b) A definition of cellulose nanomaterial, along with additional instructions for sampling, sample preparation, and incineration for cellulose nanomaterials have been incorporated; and
c) Additional instructions are given on how to express results when a sample has low ash content.
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions 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.