GB/T 33544-2017 in English

《GB/T 33544-2017玻镁平板》由TC197（全国水泥制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is developed in accordance with the rules given in GB/T 1.1-2009.

This standard is proposed by the China Building Materials Federation.

This standard is under the jurisdiction of the National Technical Committee on Cement Products of Standardization Administration of China (SAC/TC 197).



Glass Fiber and Magnesium Cement Board

1 Scope

This standard specifies the terms and definitions, classification and designation, requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of glass fiber and magnesium cement board.

This standard is applicable to glass fiber and magnesium cement boards which are mainly used for non-bearing internal partition wall and suspended ceiling and used as the substrate of various decorative sheets.

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 100 Slotted Countersink Head Wood Screws
GB/T 1043.1 Plastics - Determination of Charpy Impact Properties - Part 1: Non - Instrumented Impact Test
GB/T 5464 Non-combustibility Test Method for Building Materials
GB 6566 Limits of Radionuclides in Building Materials
GB/T 7019 Test Methods for Fiber Cement Products
GB/T 8077-2012 Methods for Testing Uniformity of Concrete Admixture
GB 8624 Classification for Burning Behavior of Building Materials and Products
GB/T 9775 Gypsum Plasterboard
GB/T 17657 Test Methods of Evaluating the Properties of Wood-based Panels and Surface Decorated Wood-based Panels
GB 18580 Indoor Decorating and Refurbishing Materials - Limit of Formaldehyde Emission of Woodbased Panels and Finishing Products
HG/T 2680-2009 Magnesium Sulfate for Industrial Use
JC/T 449-2008 Raw Materials for Magnesia Cement
JC 561.2 Glass Fiber Reinforcing Mesh - Part 2: Glass Fiber Reinforcing Mesh for Class PB EIFS
JC 646 Glass Fiber Reinforced Magnesium Oxychloride Cement Ventiduct
JGJ 63 Standard of Water for Concrete
WB/T 1023 Magnesite Cement Material Modifiers

3 Terms and Definitions

For the purposes of this document, the following terms and definitions apply.

3.1

glass fiber and magnesium cement board

the flat board made by forced stirring and mechanical rolling from the quaternary system which is composed of light calcined magnesia (MgO), magnesium chloride (MgCl2) or magnesium sulfate (MgSO4), water (H2O) and modifier in reasonable preparation, reinforced with glass fiber mesh or other materials, and filled with light materials

3.2

leachable chloride ion

the chloride ion that can be dissolved in leaching solution after the leaching test

4 Classification and Designation

4.1 Classification

According to apparent density, products are classified into three classes, i.e. Classes A, B and C, within the classification range given in Table 1.

Table 1 Apparent Density Class In: t/cm3
Class A B C
Apparent density ρ ρ>1.1 0.9<ρ≤1.1 ρ≤0.9

4.2 Dimension

The dimension of glass fiber and magnesium cement board product is given in Table 2 and other dimensions are determined through negotiation between the Supplier and the Demander.

Table 2 Dimension In: mm
Item Length l Width w Thickness t
Basic dimension 2 440 1 220 3~30
1 830 915

4.3 Designation

Designation example: the designation is composed of product code, classification, dimension and standard No.

The model of glass fiber and magnesium cement board product is marked as shown in Figure 1.


Figure 1 Product Classification and Code

Example: glass fiber and magnesium cement board of 2 440mm×1 220mm×3mm in dimension and 1.2 t/m3 in apparent density.

It is marked as follows: BMA 2 440×1 220×3 GB/T 33544-2017.

5 Requirements

5.1 Requirements for raw materials

5.1.1 Magnesium oxide shall meet the requirements for Grade II product or above given in Table 1 of JC/T 449-2008.

5.1.2 Magnesium chloride shall meet the requirements given in Table 2 of JC/T 449-2008.

5.1.3 Magnesium sulfate shall meet the requirements for Grade I acceptable product or above given in Table 1 of HG/T 2680-2009.

5.1.4 Glass fiber cloth shall meet the requirements of JC 561.2.

5.1.5 Water shall meet the requirements of JGJ 63.

5.1.6 Modifier shall meet the requirements of WB/T 1023.

5.2 Technical requirements

5.2.1 Appearance quality

Glass fiber and magnesium cement board shall have smooth surface and regular corners and be free from defects such as ripple, groove, breakage, crack and delamination that affect the application.

5.2.2 Permissible dimensional deviation

The permissible dimensional deviation of board shall meet the requirements given in Table 3.

Table 3 Permissible Dimensional Deviation In: mm
Item Permissible dimensional deviation
Length l

Width w

Thickness t t<6 ±0.20
6≤t≤10 ±0.30
t>10 ±0.50
Diagonal difference ≤5

5.2.3 Physical and chemical properties

5.2.3.1 The bending strength and impact strength of glass fiber and magnesium cement board shall meet the requirements given in Table 4.

Table 4 Bending Strength and Impact Strength
Class Bending strength/MPa Impact strength/(kJ/m2)
t<6 6≤t≤10 t>10 t<6 6≤t≤10 t>10
A ≥12.0 ≥10.0 ≥8.0 ≥3.5 ≥3.0 ≥2.0
B ≥10.0 ≥8.0 ≥6.0 ≥3.0 ≥2.5 ≥2.0
C ≥8.0 ≥6.0 ≥5.0 ≥3.0 ≥2.5 ≥2.0
Note: t in the table represents thickness, expressed in millimeters (mm).

5.2.3.2 Apparent density, of which the deviation shall not exceed ±5%.

5.2.3.3 Water content at the end of manufacturing, which shall not exceed 8%.

5.2.3.4 Dry shrinkage, which shall not exceed 0.3%.

5.2.3.5 Moisture expansion, which shall not exceed 0.3%.

5.2.3.6 Screw holding capability shall meet the requirements given in Table 5.

Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Designation
5 Requirements
6 Test Methods
7 Inspection Rules
8 Marking, Packaging, Transportation and Storage
Annex A (Normative) Determination of Chloride Ion Content
Annex B (Normative) Determination of Leachable Chloride ion Content
Annex C (Normative) Determination of Screw Holding Capability