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LY/T 1636-2005 (LYT 1636-2005)

Chinese Standard: 'LY/T 1636-2005'
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Standard ID LY/T 1636-2005 (LY/T1636-2005)
Description (Translated English) Use category and specification for preservative-threated wood
Sector / Industry Forestry Industry Standard (Recommended)
Classification of Chinese Standard B71
Classification of International Standard 65.020
Word Count Estimation 6,628
Date of Issue 2005-08-16
Date of Implementation 2005-12-01
Adopted Standard AWPA Standard U1-2003, NEQ
Drafting Organization China Forestry Science Institute of Wood Industry
Administrative Organization China Timber Standardization Technical Committee
Regulation (derived from) State Forestry Administration Notice No. 1, 2010
Summary This standard applies to water-borne preservatives by treated wood and its products. According to this standard timber and its products in different application environments and conditions of use of biological destruction suffered factor against the degree of risk, provides for the classification and the use of wood preservative wood preservative treatment should meet requirements.

LY/T 1636-2005
ICS 65.020
B 71
Use category and specification
for preservative-treated wood
Issued by. State Forestry Administration of the People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Category ... 5 
5 Requirements ... 5 
This Standard is not equivalent to the American Wood Preservers’ Association (AWPA) Standard
U1-03 Application Classification System. Specifications for Preservative-treated Wood Users
(2003 standard).
This Standard was proposed by and shall be under the jurisdiction of National Technical
Committee 41 on Timber of Standardization Administrator of China.
Responsible drafting organization of this Standard. Research Institute of Wood Industry, Chinese
Academy of Forestry.
Participating drafting organizations of this Standard. Forintek Canada Corp., Finnforest
Corporation Shanghai Representative Office, Fujian Zhangping Kimura Forestry Products Co.,
Ltd., Changzhou Yuanda Wooden Structure Cooling Tower Co., Ltd., Koppers Arch Wood
Protection (Australia) Pty Ltd, Koshii Preserving Co, Ltd, Hunan Lengshuijiang Chemical
Anticorrosive Technology Development Co., Ltd., Guangzhou Fernz DAVCO Construction
Material Co., Ltd.
The main drafters of this Standard. Li Yudong, Paul Morris, Tian Zhenkun, Wu Dongping, Jiang
Jianzhong, Yang Jinxian, Megumi-shi Maeda, Duan Zihai, Fang Wuxin and Jiang Mingliang.
The Standard is first-time released.
Use Category and Specification
for Preservative-treated Wood
1 Scope
According to the danger level of wood and its wooden products invaded by biodeterioration
agents under different application environments and service conditions, this Standard specifies
the use category of preservative-treated wood and the requirements that shall be achieved by
preservative-treated wood.
This Standard applies to wood and its wooden products processed by water-borne preservatives.
2 Normative references
The articles contained in the following documents have become this document when they are
quoted herein. For the dated documents so quoted, all subsequent modifications (including all
corrections) or revisions made thereafter do not apply to this Standard. However, the parties who
reach an agreement according to this Standard are encouraged to study whether the latest
versions of these documents may be used. For the undated documents so quoted, the latest
versions (including all modification sheets) apply to this document.
GB/T 14019-1992 Glossary of terms used in wood preservation
LY/T 1635-2005 Wood preservatives
3 Terms and definitions
For the purpose of this Standard, the terms and definitions given in GB/T 14019-1992 as well as
the following terms and definitions shall apply.
3.1 Wood biodeterioration agents
It is the organism leading to wood deterioration (degeneration and damage), including
microorganisms (mainly are wood-rotting fungi, staining fungi and mold), insects (mainly are
wood pests) and marine boring animals.
3.2 Retention
Absorption dose
(Preservative) maintenance dose
It is the number of effective ingredients of the preservative retained in the wood after the
preservative treatment.
3.3 Penetration percentage in sapwood
penetration percentage of the preservative in sapwood is the smallest sapwood penetration
percentage, expressed as a percentage (%).
5.2.2 The penetration percentage of the preservative in sapwood shall meet the requirements
specified in Table 3.
Table 3 Penetration Percentage of Preservative in Sapwood
Use category Penetration percentage of sapwood
C1 ≥ 85%
C2 ≥ 85%
C3 ≥ 90%
C4A ≥ 90%
C4B ≥ 95%
C5 ≥ 100%
5.2.3 Test sample shall be taken from the middle of the longitudinal direction of the wood; knots,
cracking and reaction wood shall be avoided when determining the specific location. After the
location is determined, the middle wood block shall be taken for the cross wood or the heart wood
shall be drilled with hollow drill.
5.2.4 The number of test samples shall be determined, and the wood with the same species and
the same thickness in each unit preservative treatment is regarded as a batch. If the handling
capacity of each batch of wood <5 m3, 5 samples shall be drawn. If the handling capacity of each
batch of wood ≥ 5 m3, 10 samples shall be drawn.
5.2.5 The detection of penetration shall be carried out in the cross-section of the wood or the
longitudinal direction of heart wood.
5.2.6 The qualified rate of detection results shall be ≥ 80%.
5.2.7 If unqualified, the results can be reviewed. But it shall conduct double sampling, and the
qualified rate shall be ≥ 80%.
5.3 Other requirements
5.3.1 The su......
Related standard: LY/T 3195-2020    LY/T 3148-2019
Related PDF sample: LY/T 1635-2005