LY/T 1636-2005 English PDF (LY/T1636-2005)

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LY/T 1636-2005: Use category and specification for preservative-threated wood
LY/T 1636-2005
LY
FORESTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.020
B 71
Use category and specification
for preservative-treated wood
ISSUED ON. AUGUST 16, 2005
IMPLEMENTED ON. DECEMBER 01, 2005
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 
Foreword
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 surface of preservative-treated wood shall have no visible preservative sediments.
5.3.2 Before the preservative treatment, the wood shall be processed to a final size as far as
possible, so as to avoid the sawing, drilling and other machining of preservative-treated wood.
5.3.3 If the sawing, drilling, mortising, slotting or processing of preservative-treated wood is
conducted, the original preservative concentrates or other suitable preservatives shall be used to
coat the newly exposed surface of the wood, so as to seal the newly exposed surface of the wood.