GB/T 9846-2015 English PDF (GBT9846-2015)

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GB/T 9846-2015: Plywood for general use
GB/T 9846-2015
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 79.060.10
B 70
Replacing GB/T 9846.1 ~ 9846.8-2004
Plywood for general use
ISSUED ON. JULY 03, 2015
IMPLEMENTED ON. NOVEMBER 02, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
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Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Classification ... 6 
5 Requirements ... 6 
5.1 Specifications dimensions and their deviations ... 6 
5.2 Appearance quality ... 7 
5.3 Physical and chemical properties ... 16 
5.4 Other technical requirements ... 18 
6 Measurement and test methods ... 18 
6.1 Specification dimension measurement ... 18 
6.2 Sampling and dimension requirements ... 19 
6.3 Test methods ... 21 
7 Inspection rules ... 23 
7.1 Classification of inspections ... 23 
7.2 Sampling plan ... 23 
7.3 Judgement rules ... 24 
7.4 Comprehensive judgment ... 26 
7.5 Metering of products ... 26 
8 Marking, packaging, transportation and storage ... 26 
8.1 Marking ... 26 
8.2 Packaging ... 26 
8.3 Transportation and storage ... 27 
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Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This standard is the integration and revision of GB/T 9846.1 ~ 9846.8-2004
“Plywood”.
As compared with GB/T 9846.1 ~ 9846.8-2004, in addition to editorial changes,
the main technical changes are as follows.
- MODIFY the standard name from the “Plywood” to the “Plywood for
general use”;
- MODIFY the scope of application of the standard;
- INTEGRATE 8 series standards into one standard;
- ADD terms and definitions;
- DELETE the classification by overall appearance, end-user requirements,
composition, mechanical properties, and application;
- MODIFY the length and width deviation;
- MODIFY the thickness deviation;
- ADD the determination of flatness; CANCEL the determination of warpage;
- MODIFY the pretreatment conditions of class III plywood;
- MODIFY the slot depth of the adhesive strength sample;
- MODIFY the lower limit of water content;
- ADD the timber species. eucalyptus, the adhesive strength index value ≥
0.70 MPa;
- ADD the gum canal defect in the appearance defects in the broad-leaved
wood (including tropical broad-leaved wood);
- ADD the sample production schematic diagram;
- Formaldehyde emission index value follows the provisions of GB 18580;
- ADD the test methods and index value of the static bending strength and
elastic modulus;
- ADD the impregnation peeling test method and index value;
Plywood for general use
1 Scope
This standard specifies the terms and definitions, classification, requirements,
measurement and test methods, inspection rules and marking, packaging,
transportation and storage, of plywood for general uses.
This standard applies to the plywood for general use, AND it is not applicable
to the core board, veneer laminated timber, or other plywood having different
structures and special performance requirements.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 1933 Method for determination of the density of wood
GB/T 2828.1-2012 Sampling procedures for inspection by attributes – Part
1. Sampling schemes indexed by acceptance quality limit (AQL) for
lot-by-lot inspection
GB/T 17657-2013 Test methods of evaluating the properties of wood-based
panels and surface decorated wood-based panels
GB/T 18259-2009 Terms of wood-based panels and its surface decoration
GB 18580 Indoor decorating and refurbishing materials – Limit of
formaldehyde emission of wood-based panels and finishing products
GB/T 19367-2009 Wood-based panels - Determination of dimensions of
panels
3 Terms and definitions
The following definitions and definitions as defined in GB/T 18259-2009 apply
to this document. For ease of use, some of the terms and definitions as defined
in GB/T 18259-2009 are listed below again.
3.1
Class I plywood
It refers to the weather fastness plywood for outdoor use which can pass
the boiling test.
[GB/T 18259-2009, definition 2.2.1.18]
3.2
Class II plywood
It refers to the water-resistant plywood for wet conditions which can pass
the 63 °C ± 3 °C hot water immersion test.
[GB/T 18259-2009, definition 2.2.1.19]
3.3
Class III plywood
It refers to the non-moisture resistant plywood for dry conditions which can
pass the 20 °C ± 3 °C cold water immersion test.
3.4
Plywood tree species
Plywood panel tree species is this plywood tree species.
4 Classification
4.1 In accordance with the environment of use, it is divided into the following.
a) Used under dry conditions;
b) Used under wet conditions;
c) Used under outdoor conditions.
4.2 In accordance with the surface processing conditions, it is divided into the
following.
a) Non-sanding board;
b) Sanding board.
5 Requirements
5.1 Specifications dimensions and their deviations
5.1.1 Specifications dimensions
5.1.1.1 Plywood dimensions shall comply with the requirements of Table 1.
into three grades. excellent grade product, first grade product, and qualified
grade product. The panels of these three grades shall be sanded/scraped
smooth, AND those panels having special requirements may not be sanded
(scraped) smooth OR sanded (scraped) smooth at both sides.
5.2.1.2 In accordance with user needs, it may produce the plywood which is
composed of the panels and back plates of different grades.
5.2.2 Allowable defects
5.2.2.1 The allowable defects of general plywood of each grade which uses the
wide-leaved wood veneer as the panel are as shown in Table 3.
5.2.2.2 The allowable defects of general plywood of each grade which uses the
needle-leaved wood veneer as the panel are as shown in Table 4.
5.2.2.3 The allowable defects of general plywood of each grade which uses the
tropical wide-leaved wood veneer as the panel are as shown in Table 5.
Table 3 -- Allowable defects of wide-leaved wood plywood classified by
appearance
Type of defect Inspection item
Panel
Back plate
Plywood grade
Excellent
grade
product
First grade
product
Qualified
product
(1) Pin knot - Allowable
(2) Intergrown knot Maximum single diameter / mm 10 20 Not limited
(3)
Partially
intergrown knot,
dead knot, bark
pocket
Total number per
square meter of
panel
Not
allowed 4 6 Not limited
Partially
intergrown knot
Maximum single
diameter / mm
Not
allowed
15 (not
counted from 5
below)
Not limited
Dead knot Maximum single diameter / mm
Not
allowed
4 (not counted
from 2 below) 15 Not limited
Bark pocket Maximum single length / ...