introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

International standards are drafted in accordance with the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to develop international standards. The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.

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ISO 12625-8-2020 Tissue paper and tissue paper products – Part 8: Water absorption time and capacity, basket soaking test method

ISO 12625-8 is produced by the Technical Committee of the European Committee for Standardization (CEN) CEN/TC 172 (Pulp, paper and board) in collaboration with the Technical Committee ISO/TC 6 (Paper, board and pulp) and Sub-committee SC 2 (Test methods and quality specifications for paper and board). Prepared in accordance with the Technical Cooperation Agreement between ISO and CEN (Vienna Agreement).

The second edition cancels and replaces the technically revised first edition (ISO 12625-8:2006).

The fundamental change in this standard is the separation of so-called “manual methods” and the exclusion of “automatic methods”. For more details, see Introduction.

ISO 12625 consists of the following parts, under the general heading Tissue paper and household paper products:

– Part 1: General principles of terminology use

– Part 3: Determination of thickness, swelling thickness and apparent packing density

– Part 4: Determination of tensile strength, tensile at break and tensile energy absorption

– Part 5: Determination of wet tensile strength

– Part 6: Determination of gram weight

– Part 7: Determination of optical properties – Measurement of luminance and chroma

– Part 8: Water absorption time and capacity, basket soaking test method

– Part 9: Determination of the bursting strength of the ball

– Part 12: Determination of tensile strength of perforating lines – Calculation of perforating efficiency

ISO 12625-8-2020 Tissue paper and tissue paper products – Part 8: Water absorption time and capacity, basket soaking test method

introduce
This part of ISO 12625 describes a principle for determining the water absorption properties of tissue and household paper by inserting a sample piece into a cylindrical basket submerged in water. The result is expressed as

– Suction time, as well

— Ability to absorb water.

In European and international trade, water absorption time and water absorption capacity are important parameters in the field of comparison of household paper products.

Both manual and automatic methods exist, but the procedures described in this part of ISO 12625 refer only to manual devices. The reason is that accurate results obtained using different automated methods included in inter-laboratory studies are not acceptable compared to results obtained using manual test methods.

However, automated test methods can be used, provided they can be shown to give the same results as manual methods in terms of mean and standard deviation.

ISO 12625-8-2020 Tissue paper and tissue paper products – Part 8: Water absorption time and capacity, basket soaking test method

1 Range
This part of ISO 12625 specifies a basket immersion test method for determining the water absorption time and capacity of tissue and tissue paper.

It is specified that impurities and dents in tissue paper and tissue paper products are tested according to ISO 15755.

For the determination of moisture content in tissue paper and tissue paper products, ISO 287 applies.

2 Normative references

The following reference files are difficult or lacking for the use of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 186, Paper and board – sampling to determine average quality

ISO 187, Paper, board and pulp – Standard atmospheres for conditioning and testing and procedures for monitoring sample atmospheres and conditioning

ISO 14487, pulp – Standard water for physical testing

ISO 12625-8-2020 Tissue paper and tissue paper products – Part 8: Water absorption time and capacity, basket soaking test method

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Absorption time

The time required for the sample to be fully wetted

3.2 Water absorption capacity

The amount of water absorbed by the specimen per unit mass under specified conditions

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