GB/T 465.2-2008Paper and board -- Determination of tensile strength after immersion in water (English PDF)

1 Scope

This Part of GB/T 465 specifies the method of determining the tensile strength of paper and board after being immersed in water for a specified time and uses this to measure the wet strength of paper and board.

This Part is applicable to various types of paper and board with wet strength requirements.

2 Normative References

Through the reference in this Part of GB/T 465, the clauses of the following documents become clauses of this Part. In terms of references with a specified date, all the subsequent modification sheets (excluding the corrected content) or revised versions are not applicable to this Part. However, the various parties that reach an agreement in accordance with this Part are encouraged to explore the possibility of adopting the latest version of these documents. In terms of references without a specified date, the latest version is applicable to this Part.

GB/T 450 Paper and Board - Sampling for Testing and Identification of Machine and

Cross Direction, Wire Side and Felt Side (GB/T 450-2008, ISO 186:2002, MOD)

GB/T 10739 Paper, Board and Pulps - Standard Atmosphere for Conditioning and

Testing (GB/T 10739-2002, ISO 187:1990)

GB/T 12914 Paper and Board - Determination of Tensile Properties (GB/T 12914-2008,

ISO 1924-1:1992, ISO 1924-2:1992, MOD)

3 Terms and Definitions

The following terms and definitions are applicable to this Part of GB/T 465.

8 Result Expression

8.1 The average value of the determined wet tensile strength after immersion shall be expressed in (kN/m) and accurate to three significant figures. If multi-layer samples are used for the determined, then, calculate in accordance with Formula (1):

Where,

P---the wet tensile strength of each layer after immersion in water, expressed in (kN/m);

S---the wet tensile strength of multiple layers after immersion in water, expressed in (kN/m);

n---the number of layers being determined.

8.2 The wet tensile strength retention rate after immersion shall be expressed in (%) and accurate to one decimal place. It shall be calculated in accordance with Formula (2):

Where,

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