GB/T 21140-2017 in English

VALID

Non-structural finger jointed lumber

Issued on:2017-11-01
Implemented on:2018-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $200.00
$194.00

Standard No:	GB/T 21140-2017
Document status:	VALID
Title in English:	Non-structural finger jointed lumber
Title in Chinese:	非结构用指接材
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-11-01
Implemented on:	2018-05-01
Superseding:	GB/T 21140-2007 Finger-jointed lumber—Non-structural
ICS Classification:	79.080-Semi-manufactures of timber
Chinese Classification:	B69-Timber and processed timber
Professional Classification:	GB-National Standard
Related Keywords:	finger-joined non-structural materials non-structural finger non-moisture-resistant non-structural finger-joined timber moisture-resistant non-structural finger-joined timber class iii non-structural finger-jointed materials
Related Topics:	GBT21140 GB/T 21140-2007 GB/T 21140-2017 Non-structural finger-jointed materials Structural materials for low temperature

《GB/T 21140-2017非结构用指接材》由TC198（全国人造板标准化技术委员会）归口，主管部门为国家林业和草原局。

Introduction

Interpretation of GB/T 21140—2017 Standard for Finger-joined Non-structural Materials

1. Overview of the Standard

GB/T 21140—2017 "Finger-joined Non-structural Materials" is a revision of GB/T 21140—2007. The main technical contents include:

Modify the name of the standard
Adjust terms and definitions
Optimize the classification method
Add physical and chemical performance indicators (such as formaldehyde emission)
Update the calculation method of flexural strength

2. Classification and Structure

Finger-joined non-structural materials are divided into three categories according to their water resistance:

Category

Item	Dimensional deviation of planed timber
Class I	Weather-resistant non-structural finger-joined timber
Class II	Moisture-resistant non-structural finger-joined timber
Class III	Non-moisture-resistant non-structural finger-joined timber

3. Dimensional deviation and appearance quality

Dimensional deviation is an important indicator to measure product quality. The specific requirements are as follows:

Item	Dimensional deviation of planed timber
Length	2 mm/m, and maximum ≤10mm
Width	±0.5 mm
Thickness curvature	±0.2 mm, 1.0%

4. Physical and chemical performance indicators

Physical and chemical properties are the core standards for evaluating the quality of finger-joined materials. The specific requirements are as follows:

Item	Unit	Indicator requirements
Moisture content	%	8～15
Immersion stripping	-	The stripping length of any adhesive layer on the cross section of the specimen shall not exceed 1/3 of the length of the adhesive layer, and the total stripping length of the adhesive layer on the cross section shall be less than or equal to 10% of the total adhesive layer
Bending strength at face value	MPa	≥10
Formaldehyde emission	-	In accordance with GB18580

5. Implementation suggestions

To ensure the quality of non-structural finger-jointed materials, it is recommended to:

Strictly screen and process raw materials in accordance with standard requirements
Establish a complete quality inspection system
Strengthen quality control during the production process
Regularly maintain and calibrate production equipment
Pay attention to the control of product packaging and storage conditions

More samples: JC/T 2453-2018 JJG 21-2008 DL/T 368-2010

Sample only — not a preview of GB/T 21140-2017