PDF GB/T 14732-2017 English (GB/T 14732-2006: Older version)
Search result: GB/T 14732-2017 (GB/T 14732-2006 Older version)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 14732-2017 | English | 130 |
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Wood adhesives: urea-formaldehyde, phenol-formaldehyde and melamine-formaldehyde resins
| Valid |
| GB/T 14732-2006 | English | 359 |
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Wood adhesives: Urea formaldehyde, phenol formaldehyde and melamine formaldehyde resins
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| GB/T 14732-1993 | English | 479 |
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Wood adhesives: urea-formaldehyde, phenol-formaldehyde and melamine-formaldehyde resins
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PDF Preview: GB/T 14732-2017
GB/T 14732-2017: PDF in English (GBT 14732-2017) GB/T 14732-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.180
G 39
Replacing GB/T 14732-2006
Wood adhesives. urea-formaldehyde, phenol-
formaldehyde and melamine-formaldehyde resins
ISSUED ON. DECEMBER 29, 2017
IMPLEMENTED ON. JULY 1, 2018
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.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Classification ... 9
5 Requirements... 9
6 Test method ... 11
7 Inspection rules ... 12
8 Marking, packaging, transportation and storage ... 13
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 14732-2006 “Wood adhesives. Urea formaldehyde,
phenol formaldehyde and melamine formaldehyde resins”. Compared with GB/T
14732-2006, the main differences are as follows.
-- Modified the term "urea-melamine formaldehyde resin". (see 3.8);
-- Modified the free formaldehyde content indicator of urea-formaldehyde resins for
cold pressing (see chapter 5, Table 1);
-- Added the technical indicators of impregnation peel strength (see chapter 5, Table
1);
-- Modified the free phenol content indicator of phenol-formaldehyde resin (see
chapter 5, Table 2);
-- Added "Conduct the formaldehyde emission test according to the specifications.
Test immediately after 7 d placement of the specimen after preparation " in the
test method.(see chapter 6);
-- Modified the contents of the type inspection from "including all" to "selecting all
the items in Table 1, Table 2 or Table 3 according to the type of the product" and
added the timing of the type inspection (see 7.1.2);
-- Deleted of the content of timing of the type inspection (see chapter 7);
-- Modified the contents of the packing marks (see 8.1.1 and 8.1.2).
Please note that some of the contents of this document may be patented. The
publisher of this document shall not be responsible for the identification of these
patents.
This Standard was proposed by the State Forestry Administration.
This Standard shall be under the jurisdiction of the National Technical Committee of
the Standardization of Wood-based panels (SAC/TC 198).
Drafting organizations of this Standard. South China Agricultural University,
Guangzhou Chang'an adhesive manufacturing Co., Ltd., Guangzhou Haohanghao
Decoration Material Manufacturing Co., Ltd., Linyi Xinyan Chemical Co., Ltd.,
Wood adhesives. urea-formaldehyde, phenol-
formaldehyde and melamine-formaldehyde resins
1 Scope
This Standard specifies the terms and definitions, classification, requirements, test
methods, inspection rules, marks, packaging, transportation and storage of urea-
formaldehyde, phenol-formaldehyde and melamine-formaldehyde resins for wood
adhesives.
This Standard is applicable to all kinds of wood adhesives and synthetic resins for
impregnation synthesized by condensation polymerization with formaldehyde and urea
or phenol and melamine as the main raw materials. It also applies to synthetic resin of
polycondensation from the substitution of melamine and phenol, urea or using
resorcinol to replace part of phenol.
This Standard is not applicable to emulsion phenolic resin.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 4897-2015 Particleboard
GB/T 5849-2006 Blockboard
GB/T 9846-2015 Plywood for general use
GB/T 11718-2009 Medium density fibreboard
GB/T 14074-2017 Testing methods for wood adhesives and their resins
GB 18580 Indoor decorating and refurbishing materials. Limit of formaldehyde
emission of wood-based panels and finishing products
3 Terms and definitions
The following terms and definitions apply to this document.
with the shear stress, and the resulting viscosity is called the apparent viscosity under the
corresponding shear.
Note 2. The unit is milli-Pa second (mPa·s).
3.11 Solids content
Under specified test conditions, percentage of the mass of non-volatile substances in
the total mass of the resin (or adhesive).
Note. solid content is also called conventional solid content.
3.12 pH value
The negative logarithm of hydrogen ion concentration in solution.
Note. the pH value indicates the acidity or alkalinity of the substance and the extent to which it
is strong or weak.
3.13 Water miscibility; miscibility with water
Under the specified test conditions, when the micro-insoluble resin appears in the
water, the ratio of the water mass to the resin mass. It is expressed in multiple.
3.14 Free formaldehyde content
The percentage of the mass of formaldehyde existing in a free state such as
formaldehyde, formaldehyde hydrate etc., in polycondensation resin accounts for the
total mass of the resin.
3.15 Free phenol content
The percentage of the mass of phenols in phenol-formaldehyde resin that did not take
part in reaction accounts for the total mass of the resins.
3.16 Brominable substance content
The percentage of the mass of phenol converted from the mass of brominable active
groups in the phenolic resin to the total mass of the resin.
3.17 Hydroxymethyl group content; methylol content
The percentage of the mass of the active group in the form of hydroxymethyl (-CH2OH)
in the resin accounts for the total mass of the resin.
3.18 Pot life; working life
The longest period of time for the prepared adhesive or active resin to maintain its
3.29 Impregnating
The process of infiltrating resin or adhesives into porous materials (such as textiles,
paper, wood, etc.).
3.30 Internal bond strength
The ratio of the maximum tensile force to destroy the test piece perpendicular to the
piece surface to the material area of the test piece.
4 Classification
4.1 By main synthetic raw materials.
- Urea-formaldehyde resin;
- Phenol-formaldehyde resin;
- Melamine formaldehyde resin.
4.2 By adhered unit.
- Veneer types, such as plywood and blockboard;
- Fibres, such as medium density fibreboard;
- Shavings, such as particleboard.
4.3 By process of the resin.
- Hot-pressing resins;
- Cold-pressing resin.
4.4 By function of the resin.
- Adhesive resin;
- Impregnating resin.
5 Requirements
5.1 For technical requirements of urea-formaldehyde resin, melamine modified urea-
formaldehyde resin see Table 1.
representativeness. The number of samples drawn from each unit shall be basically
the same. The total number of samples shall be no less than the amount required for
three tests. If retaining samples is required, the amount of samples to be retained shall
be added.
7.4 Determination of results
7.4.1 If all properties of factory inspection meet the requirements of this type of resin,
the resin is qualified. If any one of the indicators does not meet the requirements, the
resin is unqualified.
If all the properties of type inspection meet the requirements of this type of resin, the
resin is qualified. If any one of the indicators does not meet the requirements, the resin
is unqualified.
7.4.2 If the Buyer requires inspecting the product dispatched in batches, the request
shall be put forward within the storage period agreed between the parties and the result
shall be determined in accordance with 7.4.1.
8 Marking, packaging, transportation and storage
8.1 Packing marks
8.1.1 The packaging of resin shall indicate the following contents. product name,
manufacturer’s name, factory location, trademark, quantity(net weight and gross
weight), production date or batch number and executed standard number.
8.1.2 Each batch of products shall be provided with a product inspection report, in
which the main contents shall include. free formaldehyde content, product executed
standard number, signature of inspector, factory stamp or inspection department stamp.
8.2 Packaging
The resin shall be packed in a sealed container that meets the quality requirements.
8.3 Transport and storage
8.3.1 Before storage and transportation of the product, verify that the packaging is
intact and does not leak.
8.3.2 Handle gently during transportation, loading and unloading.
8.3.3 Containers containing resin shall be stored in a dry and ventilated place. The
storage temperature of urea-formaldehyde resin and phenolic resin is 10°C ~ 30°C.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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