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GB/T 1927.5-2021Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density (English PDF)

无疵小试样木材物理力学性质试验方法第5部分：密度测定

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

December 31, 2021

Implementation date

July 1, 2022

Scope

GB/T 1927.5-2021 is the English-translated version of 无疵小试样木材物理力学性质试验方法第5部分：密度测定.

GB/T 1927.5-2021 is the Chinese standard "Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density".

Its scope clause reads: This document describes the test method for the determination of wood density: This document is applicable to the determination of the density, air-dry density, absolute dry density and basic density of unblemished small sample wood at the corresponding moisture content:. Its clauses include terms and definitions.

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Document preview — GB/T 1927.5-2021

National Standard of the People's Republic of China

Classification: B 68

Issued by: State Administration for Market Regulation, China National Standardization Administration

foreword
Introduction
1 Scope
2 Normative references
3 Terms and Definitions

1 Scope

This document describes the test method for the determination of wood density:

This document is applicable to the determination of the density, air-dry density, absolute dry density and basic density of unblemished small sample wood at the corresponding moisture content:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document:

GB/T 1927:2-2021 Test methods for physical and mechanical properties of wood with small unblemished samples - Part 2: Sampling methods and general requirements (ISO 3129:2019, MOD)

GB/T 1927:4-2021 Test methods for physical and mechanical properties of wood with small samples without flaws-Part 4: Determination of moisture content (ISO 13061-1:2014, MOD)

LY/T 1788-2008 Terms of wood properties

3 Terms and Definitions

The terms and definitions defined in LY/T 1788-2008 and the following terms and definitions apply to this document:

3:1 densityofwood

The mass of wood per unit volume:

[Source: LY/T 1788-2008, 3:3:2]

3:2 air-drydensity

The ratio of mass to volume when wood reaches equilibrium moisture content in a certain atmospheric state:

Note: Generally refers to the density value when the moisture content is 12%:

[Source: LY/T 1788-2008, 3:3:4, with modifications]

3:3

Oven-drydensity

The ratio of the dry mass of the wood to the dry volume of the wood:

3:4 basic density

The ratio of the dry mass of the wood to the volume of the green wood:

[Source: LY/T 1788-2008, 3:3:3, with modifications]

GB/T 18107 | LY/T 2407 | LY/T 1184 | GB/T 1927.14 | GB/T 1927.13 | GB/T 1927.11 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 1927Test methods for physical and mechanical properties of small clear wood specimens - Part 1: Collection of sample tree

ISO 3129

Cited by

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