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GB/T 7134-2008 PDF in English


GB/T 7134-2008 (GB/T7134-2008, GBT 7134-2008, GBT7134-2008)
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GB/T 7134-2008: PDF in English (GBT 7134-2008)

GB/T 7134-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.10
G 32
Replacing GB/T 7134-1996
Poly (methyl methacrylate) cast sheets
(ISO 7823-1:2003, Plastics - Poly (methyl methacrylate) sheets - Types, dimensions
and characteristics - Part 1: Cast sheets, MOD)
ISSUED ON: AUGUST 04, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions... 7 
4 Ingredients ... 8 
5 Technical requirements ... 8 
6 Test method ... 11 
7 Inspection rules ... 14 
8 Marking, packaging, transportation, storage ... 15 
Appendix A (Normative) Determination of dimensional change (shrinkage) after
heating ... 16 
Appendix B (Informative) Comparison of clause numbers between this standard and
ISO 7823-1:2003 ... 18 
Appendix C (Informative) The technical differences between this standard and ISO
7823-1:2003 and reasons ... 20 
Poly (methyl methacrylate) cast sheets
1 Scope
This standard specifies the terms and definitions, components, technical requirements,
test methods, inspection rules, marking, packaging, transportation, storage of poly
(methyl methacrylate) cast sheets.
This standard applies to colorless and colored transparent, translucent or opaque
plexiglass sheets (hereinafter referred to as sheets), which has a thickness of 1.5 mm ~
50 mm, AND are made of methyl methacrylate as raw materials, by bulk polymerization
in a specific mold.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 1033.1-2008 Plastics - Methods for determining the density of non-cellular
plastics - Part 1: Immersion method liquid pyknometer method and titration method
(ISO 1183-1:2004, IDT)
GB/T 1034-2008 Plastics - Determination of water absorption (ISO 62:2008, IDT)
GB/T 1036-2008 Test method for coefficient of linear thermal expansion of plastics
between -30°C and 30°C with a vitreous silica dilatometer (ASTM D696:2003,
MOD)
GB/T 1040.1-2006 Plastics - Determination of tensile properties - Part 1: General
principles (ISO 527-1:1993, 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 1041-2008 Plastics - Determination of compressive properties (ISO 604:2002,
IDT)
GB/T 1043.1-2008 Plastics - Determination of Charpy impact properties - Part 1:
Non - instrumented impact test (ISO 179-1:2000, IDT)
3.1
Non-modified cast PMMA sheet
It refers to the methyl methacrylate homopolymer sheet, or the copolymer sheet of
methyl methacrylate and acrylate or methacrylate monomer, which is produced by
bulk polymerization, through appropriate initiators.
3.2
Flat PMMA sheets
A sheet, which has substantially parallel surfaces on both sides.
4 Ingredients
Methyl methacrylate, diisobutyronitrile, dioctyl phthalate, etc. are the main raw and
auxiliary materials; the content of other monomers, plasticizers (become part of the
polymer without chemical reaction) and crosslinking agents (material whose polymer
chains are linked) shall not make the performance value of the sheet lower than the
standard requirements.
Other additives, such as colorants, UV absorbers, mold release agents, can be added, to
obtain the specified properties.
Relevant additives shall comply with national environmental and regulatory
requirements.
5 Technical requirements
5.1 Appearance
5.1.1 Surface defects
The surface of the sheet shall be smooth. There shall be no scratches, spots or other
surface defects, which are greater than 3 mm2 in the sheet.
5.1.2 Internal defects
There shall be no air bubbles, impurities, cracks or other defects, which are greater than
3 mm2 in the sheet, which may adversely affect the intended application properties of
the sheet.
5.1.3 Classification of defects
The area of sheet defects shall be classified, according to the provisions of Table 1.
Each defect shall be considered separately.
The inspection of defects and their distribution shall be carried out indoor, with
sufficient natural light OR by a daylight fluorescent lamp which has a rated power of
not less than 40 W and a color temperature of 6500 K ± 650 K.
6.3 Color
The method of measuring the color difference between the standard color sheet and the
test sheet shall be agreed by the relevant parties.
6.4 Dimensions
6.4.1 The length and width shall be measured, by a measuring tool which has an
accuracy of 1 mm, according to 5.3.4.
6.4.2 The thickness of the sheet shall be measured, according to 5.3.4, using a
measuring tool which has an accuracy of 0.1 mm. The measurement shall be made, at
not less than 100 mm from the edge of the sheet.
6.5 Mechanical properties
6.5.1 Bending properties
Make measurement according to the provisions of GB/T 9341-2008. Use specimens,
which have a thickness of 4 mm, as far as possible.
6.5.2 Tensile properties
Make measurement according to the provisions of GB/T 1040.1-2006 and GB/T
1040.2-2006, using 1B specimen. The tensile speed is 5 mm/min ± 1 mm/min; the
tensile modulus of elasticity is measured according to the provisions of GB/T 1041-
2008; the test speed is 1 mm/min ± 0.2 mm/min.
6.5.3 Unnotched impact strength of simply supported beams
Make measurement according to the provisions of GB/T 1043.1-2008.
6.5.4 Rockwell hardness
Make measurement according to the provisions of GB/T 3398.2-2008.
6.6 Thermal properties
6.6.1 Vicat softening temperature
Make measurement according to the B50 method, which is specified in GB/T 1633-2000.
The samples shall be placed at a temperature of 80 °C ± 2 °C for conditioning for 16 h;
then placed in a desiccator to cool to room temperature, before testing.
6.6.2 Heat distortion temperature
Make measurement according to method A, which is specified in GB/T 1634.2-2004.
The samples shall be placed at a temperature of 80 °C ± 2 °C for conditioning for 16 h;
then placed in a desiccator to cool to room temperature, before testing. The thickness
of the specimen shall not be less than 3 mm.
6.6.3 Dimensional change (shrinkage) after heating
Make measurement according to the provisions of Appendix A of this standard.
6.6.4 Linear expansion coefficient
Make measurement according to the provisions of GB/T 1036-2008.
6.7 Flammability
Flammability and combustion performance shall be in accordance with relevant
national requirements.
6.8 Optical properties
6.8.1 Total light transmittance
Make measurement according to the provisions of GB/T 2410-2008.
6.8.2 Haze
Make measurement according to the provisions of GB/T 2410-2008.
6.8.3 420 nm light transmittance
According to the methods of ISO 13468-1 and ISO 13468-2, measure the 420 nm light
transmittance, on the specimens before and after the xenon lamp exposure test
according to method A of GB/T 16422.2-1999 for 1000 h. The thickness of the
specimen is 1.5 mm ~ 5 mm. By agreement of the parties concerned, the transmittance
can be measured after exposure in carbon arc lamp exposure (see GB/T 16422.4-1996).
6.8.4 Refractive index of light
Make measurement according to the method A of ISO 489:1999.
6.9 Other properties
6.9.1 Density
Make measurement according to method A or method C, which is specified in GB/T
1033.1-2008.
6.9.2 Water absorption
7.4 In this standard, appearance, dimensional tolerance, Rockwell hardness, impact
strength, tensile strength, heat distortion temperature, solvent crazing resistance, total
light transmittance are exit-factory inspection items. Vicat softening temperature and
strain rate are the type inspection items, which are spot-checked once every 30 batches.
If there is any item, that does not meet the requirements of this standard in the inspection
results, it shall take double amount of specimens, from the batch of products, for re-
inspection of the unqualified items. It is determined according to the re-inspection
results.
If the re-inspection results still do not meet the requirements of the index, the re-
inspection shall be performed on a sheet-by-sheet sampling basis. If it does not meet
the requirements of this standard, it shall be treated as a non-conforming product.
7.5 When there is any disagreement between the supplier and the buyer, on the quality
of the product, it can be resolved through negotiation between the two parties, OR
arbitrated by the statutory quality inspection department.
8 Marking, packaging, transportation, storage
8.1 Marking
Each package shall have a clear and firm sign, indicating the name, specification,
trademark, grade, batch number, color, net content, production date, manufacturer, etc.
of the product. The name of the manufacturer and the words "fragile" shall be marked
on the packing box.
8.2 Packaging
The surface of the sheet shall be protected with appropriate materials upon delivery. It
shall be packaged with adhesive paper or kraft paper, polyethylene film, crates or other
materials. The adhesive paper or kraft paper, polyethylene film, etc., which are used for
surface protection, shall be easy to remove AND not cause surface contamination or
damage. The inside of the box shall be tightly packed with padding, AND a packing list
shall be attached.
8.3 Transportation
Poly (methyl methacrylate) cast sheets shall be kept clean during transportation. It shall
not be stored, in contact with organic solvents. They shall be handled with care, to avoid
damage to the packaging and products.
This product is non-hazardous.
8.4 Storage
Poly (methyl methacrylate) cast sheets shall be stored in a ventilated and dry room. It
shall not be stored with organic solvents during storage.
Appendix A
(Normative)
Determination of dimensional change (shrinkage) after heating
A.1 Specimen
Cut 3 square specimens, which have a side length of 100 mm ± 2 mm, from the sample
sheet. Their positions are approximately equal along the width of the sample.
Dry at a temperature of 70 °C ± 2 °C for 48 h. Then cool to room temperature, in a
desiccator (18 °C ~ 28 °C; 23 °C ± 2 °C if in disputes). For in-line quality control tests,
this drying stage can be omitted, BUT is required when in dispute.
Mark the 4 sides AND measure each length, accurate to 0.02 mm.
A.2 Heating program
Place the specimen horizontally on the flat plate on the shelf in the oven. Keep the oven
temperature at 160 °C ± 2 °C. Take suitable measures, to prevent the specimen from
sticking to the plate, e.g., cover the plate with a layer of talc. The heating time depends
on the thickness of the sheet AND shall be in accordance with Table A.1.
Table A.1 -- Heating time
Thickness/mm Time/min
1.5 ~ 5 60
> 5 75
Note: The specimen warps when heated, its size is difficult to measure. To reduce warpage,
lightly spread a layer of talcum powder on the lead plate (0.5 mm). Place the specimen on the
plate. Place it on the frame or shelf, which is larger and thicker than the specimen. Leave space
around the specimen, to prevent expansion of the specimen. Then lightly spread a layer of
talcum powder on the specimen. Place the second lead plate on the specimen and the shelf. Use
clips to clamp the two lead plates tightly together.
A.3 Cooling program
Cool the specimen to room temperature (18 °C ~ 28 °C; 23 °C ± 2 °C in case of dispute)
in a desiccator. Then measure 4 sides, accurate to 0.02 mm.
A.4 Calculation
The change in the length of each side of each specimen is calculated as a percentage of
the initial value. Calculate the average value of the change of the four sides of each
specimen, as well as the average value of the change of the 3 specimens of the batch.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.