GB/T 40911.2-2021 English PDF (GBT40911.2-2021)

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GB/T 40911.2-2021: Plastics -- Poly(methyl methacrylate)sheets -- Types, dimensions and characteristics -- Part 2: Extruded sheets
GB/T 40911.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.10
CCS G 33
Plastics – Poly (methyl methacrylate) sheets - Types,
dimensions and characteristics - Part 2: Extruded sheets
(ISO 7823-2:2003, MOD)
塑料制品 聚甲基丙烯酸甲酯板材
ISSUED ON: NOVEMBER 26, 2021
IMPLEMENTED ON: JUNE 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Requirements ... 8
5 Additional properties ... 10
6 Test methods ... 11
7 Inspection rules ... 15
8 Marking, packaging, transportation and storage ... 17
Appendix A (Informative) Structural changes between this document and ISO 7823-
2:2003 ... 18
Appendix B (Informative) Technical differences between this document and ISO 7823-
2:2003 and the reasons ... 20
Plastics - Poly (methyl methacrylate) sheets - Types,
dimensions and characteristics - Part 2: Extruded sheets
1 Scope
This document specifies the requirements, test methods, inspection rules, marking,
packaging, transportation and storage for extruded colorless or colored, transparent,
translucent or opaque flat poly (methyl methacrylate) (PMMA) sheets.
This document applies to PMMA extruded sheets (hereinafter referred to as “sheets”)
with a thickness ranging from 0.3 mm to 20.0 mm.
This document does not apply to PMMA modified with elastomers.
2 Normative references
The following documents are normatively referenced in this document and are
indispensable for its application. For dated references, only the version corresponding
to that date is applicable to this document; for undated references, the latest version
(including all amendments) is applicable to this document.
GB/T 1033.1-2008, Plastics - Methods for determining the density of non-cellular
plastics - Part 1: Immersion method liquid pycnometer method and titration method
(ISO 1183-1:2004, IDT)
GB/T 1034-2008, Plastics - Determination of water absorption (ISO 62:2008, IDT)
GB/T 1040.2-2006, Plastics - Determination of tensile properties - Part 2: Test
conditions for moulding and extrusion plastics (ISO 527-2:1993, IDT)
GB/T 1043.1-2008, Plastics - Determination of Charpy impact properties - Part 1:
Non-instrumented impact test (ISO 179-1:2000, IDT)
GB/T 1633-2000, Plastics - Thermoplastic materials - Determination of Vicat
softening temperature (VST) (ISO 306:1994, IDT)
GB/T 1634.1-2019, Plastics - Determination of temperature of deflection under load
- Part 1: General test method (ISO 75-1:2013, MOD)
GB/T 1634.2-2019, Plastics - Determination of temperature of deflection under load
- Part 2: Plastics and ebonite (ISO 75-2:2013, MOD)
GB/T 2410-2008, Determination of the luminous transmittance and haze of
transparent plastics
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 (ISO 2859-1:1999, IDT)
GB/T 2918-2018 Plastics - Standard atmospheres for conditioning and testing (ISO
291:2008, MOD)
GB/T 3398.2-2008, Plastics - Determination of hardness - Part 2: Rockwell hardness
(ISO 2039-2:1987, IDT)
GB/T 3682.2-2018, Plastics - Determination of the melt mass-flow rate (MFR) and
melt volume-flow rate (MVR) of thermoplastics - Part 2: Method for materials
sensitive to time-temperature history and/or moisture (ISO 1133-1:2011, MOD)
GB/T 6672, Plastics film and sheeting - Determination of thickness by mechanical
scanning (GB/T 6672-2001, ISO 4593:1993, IDT)
GB/T 6673, Determination of length and width of plastics film and sheeting (GB/T
6673-2001, ISO 4592:1992, IDT)
GB/T 9341, Plastics - Determination of flexural properties (GB/T 9341-2008, ISO
178:2001, IDT)
GB/T 12027, Plastics - film and sheeting - Determination of dimensional change on
heating (GB/T 12027-2004, ISO 11501:1995, IDT)
GB/T 16422.2-2014, Plastics - Methods of exposure to laboratory light sources - Part
2: Xenon-arc sources (ISO 4892-2:2013, IDT)
GB/T 36800.2, Plastics - Thermomechanical analysis (TMA) - Part 2: Determination
of coefficient of linear thermal expansion and glass transition temperature (GB/T
36800.2-2018, ISO 11359-2:1999, IDT)
GB/T 39691-2020, Plastics - Determination of refractive index (ISO 489:1999,
MOD)
ISO 1628-6, Plastics - Determination of viscosity number and limiting viscosity
number - Part 6: Methyl methacrylate polymers
ISO 2818, Plastics - Preparation of test specimens by machining
3 Terms and definitions
The following terms and definitions are applicable to this document.
6 Test methods
6.1 General
6.1.1 Standard environment for specimen state conditioning and testing
Unless otherwise specified, the test specimens shall be conditioned at a temperature of
(23±2) °C and a relative humidity of (50±10) % in accordance with the provisions of
GB/T 2918-2018, for not less than 48 h, and shall be tested in this environment.
The test specimen for Vicat softening temperature shall be placed at (80±2) °C for not
less than 24 h, and then cooled to room temperature in a desiccator.
The test specimen for load deflection temperature shall be placed at (80±2) °C for 16 h
~ 24 h, and cooled to room temperature in a desiccator.
The measurement of dimensions of sheets shall be carried out at room temperature, but
in case of dispute, it shall be measured under the conditions of temperature (23±2) °C
and relative humidity (50±10) % specified in GB/T 2918-2018.
6.1.2 Preparation of test specimens
Unless otherwise specified, the specimens shall be prepared in accordance with the
provisions of ISO 2818. When it is necessary to process the sheets to the thickness
required for a particular test method, one original surface shall remain unchanged.
6.1.3 Thickness of test specimens
When the thickness of the sheet is less than the thickness of the specimen required in a
particular test method, a specimen of that thickness shall be used.
6.2 Appearance
Defects and their distribution shall be observed by irradiating the sheet with sunlight or
a light source with a color temperature of (6 500±650) K and sufficient brightness.
6.3 Color
Visually inspect.
6.4 Dimensions
6.4.1 length and width
According to the provisions of GB/T 6673, use a measuring tool with a division value
not greater than 1 mm to measure the length and width of the sheet at equal intervals
along the length and width of the test specimen, and measure each test specimen at least
4 times. Calculate the width limit deviation of the recorded data according to Formula
(1), and calculate the length limit deviation according to Formula (2).
Where:
ΔW – width limit deviation, in millimeters (mm);
Wmin or max – measured minimum or maximum width, in millimeters (mm);
W0 – nominal width, in millimeters (mm).
Where:
Δl – length limit deviation, in millimeters (mm);
lmin or max – measured minimum or maximum length, in millimeters (mm);
l0 – nominal length, in millimeters (mm).
6.4.2 Thickness
According to the provisions of GB/T 6672, use a measuring tool with a division value
not greater than 0.01 mm. Measurements shall be made at a distance not less than 10
mm from the edge of the sheet. Use the recorded data to calculate the thickness limit
deviation according to Formula (3).
Where:
Δe – thickness limit dev...