GB/T 22830-2020Watercolor painting paper (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 22830-2008 "Watercolor Paper". Compared with GB/T 22830-2008, the main technical changes of this standard as follows.

---Adjusted product classification, deleted professional watercolor paper, adjusted the classification of popular watercolor paper (see Chapter 4, 2008 Chapter 4 of the edition);

---Increase the index of cotton pulp content, water absorption, durability, and bending stiffness (see Chapter 5);

---Adjusted quantitative, quantitative deviation, tightness, fracture length, retention of tensile strength after immersion in water, D65 brightness, elasticity, and abrasion resistance indicators (See Chapter 5, Chapter 5 of the 2008 edition);

---Deleted the folding endurance and sizing index (see Chapter 5 of the 2008 edition).

Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.

1 Scope

This standard specifies the terms and definitions, product classification, requirements, test methods, inspection rules, signs, packaging, transportation and Store.

This standard applies to paper for watercolor painting creation or practice.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 450 Paper and paperboard sample collection and the measurement of the vertical and horizontal directions, front and back sides of the sample

GB/T 451.1 Paper and paperboard size and skewness determination

GB/T 451.2 Determination of quantitative weight of paper and cardboard

GB/T 451.3 Determination of thickness of paper and cardboard

GB/T 459 Determination of stretchability of paper and paperboard

GB/T 462 Paper, paperboard and pulp analysis sample moisture determination

GB/T 464-2008 Dry heat accelerated aging of paper and cardboard

GB/T 465.2 Determination of tensile strength of paper and paperboard after immersion in water

GB/T 1540-Determination of water absorption of paper and paperboard-Kobo method

GB/T 1541 Paper and cardboard dust determination

GB/T 1545-2008 Determination of acidity or alkalinity of aqueous extracts of paper, paperboard and pulp

GB/T 2828.1 Sampling inspection procedure by attributes Part 1: Batch inspection sampling plan retrieved by acceptance quality limit (AQL)

GB/T 4688 Analysis of fiber composition of paper, paperboard and pulp

GB/T 7974 Determination of blue light diffuse reflectance factor D65 brightness of paper, cardboard and pulp (diffuse/vertical method, outdoor daylight conditions)

GB/T 7975 Determination of color of paper and cardboard (diffuse reflectance method)

GB/T 10342 Paper packaging and marking

GB/T 10739 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp samples

GB/T 12914 Determination of Tensile Strength of Paper and Paperboard Constant Speed Tensile Method (20mm/min)

GB/T 22364-2018 Determination of bending stiffness of paper and cardboard

3 Terms and definitions

The following terms and definitions apply to this document.