Powered by Google www.ChineseStandard.net Database: 189760 (25 May 2024)

QB/T 2490-2000 PDF in English

QB/T 2490-2000 (QB/T2490-2000, QBT 2490-2000, QBT2490-2000)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
QB/T 2490-2000English70 Add to Cart 0-9 seconds. Auto-delivery. Polyethylene (PE) Extruded Sheets Obsolete

Standards related to: QB/T 2490-2000

QB/T 2490-2000: PDF in English (QBT 2490-2000)

QB/T 2490-2000
Classification code. G33
Filing No.. 7573-2000
Polyethylene (PE) Extruded Sheets
Issued by. China Light Industry Bureau
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Product classification ... 4 
4 Requirements ... 5 
5 Test methods ... 6 
6 Inspection rules ... 7 
7 Marking, packaging, transport, and storage ... 9 
This standard is a revision to ZBG 33007-1989 Polyethylene Extruded Sheets (this
standard has its number changed to be QB/T 3630-1999 by the Guo-Qing-Han [1999] No.
112 Document, with the contents remained the same). This standard is not equivalent to
Deutsche Industry Norm DIN 16925-1987 High-density Polyethylene (HDPE) Extruded
Sheet. Technical Delivery Conditions.
There have been some changes in this standard over the original one in the geometrical
dimensions of tensile test pieces and simply supported beam impact test pieces; and the
index of elongation at break is discarded.
This standard was proposed by the Business Management Division of State Bureau of
Light Industry.
This standard shall be under the jurisdiction of the National Center for Standardization of
Plastic Products.
This standard is responsibly drafted by Beijing Plastics Research Institute.
Main drafters of this standard. Yu Peilin, Liu Xiaohui.
The industry standard QB/T 3630-1999 Polyethylene Extruded Sheets, issued by the
State Bureau of Light Industry, is annulled, from the implementation date of this standard.
Polyethylene (PE) Extruded Sheets
1 Scope
This standard specifies the product classification, requirements, test methods, test rules,
marking, packaging, transport, and storage of extruded polyethylene sheets.
This standard is applicable to the sheets shaped by extruded polyethylene resins
(hereinafter called “sheets”).
2 Normative references
The following normative documents contain provisions, which through reference in this
text, constitute provisions of this standard. At the time of publication, the editions indicated
were valid. All standards are subject to revision; the parties who reach an agreement
based on this standard are encouraged to investigate the possibility of applying the most
recent editions of the standards indicated below.
GB/T 1033-1986 Test method for density and relative density of plastics
GB/T 1040-1992 Plastics - Determination of tensile properties
GB/T 1043-1993 Plastics - Determination of Charpy impact strength of rigid materials
GB/T 2828-1987 Sampling procedures and tables for lot-by-lot inspection by attributes
(apply to inspection of successive lots or batches)
GB/T 5009.60-1996 Method for analysis of hygienic standard of products of polyethylene
polystyrene and polypropyrene for food packaging
GB 9687-1988 Hygienic standard for polyethylene products used as food containers and
3 Product classification
Sheets are divided into two categories according to density.
Low-density sheets. 0.919g/cm2 ~ 0.925g/cm3;
High-density sheets. 0.940g/cm2 ~ 0.960g/cm3
5 Test methods
5.1 Sampling
For rolled sheet sampling, it shall discard the surface layer; while preparing samples, the
distance from the samples to the sheet edge shall be not less than 50mm.
5.2 Sample conditioning and standard test environment
The samples shall be placed in the environment at a temperature of (23±2)°C for more
than 16h; and conduct the test under such condition.
5.3 Visual inspection
Conduct visual inspection to 1m2 sheets under normal natural light.
5.4 Thickness determination
Use a measuring instrument, accurate to 0.02mm, to measure three points at
even-intervals, in the direction along the width of a sheet; the measuring points at ends
shall be 20mm away from the edges of the sheet.
5.5 Width and length determination
Measure with a steel tape, accurate to 1mm.
5.6 Determination of diagonal difference
Measure the difference between the two diagonals of a sheet that is 1000mm long,
accurate to 1mm.
5.7 Density determination
Measure according to in GB/T 1033-1986.
5.8 Determination of tensile yield strength
Measure according to GB/T 1040; use Type I samples at a test speed of 50mm/min.
5.9 Inspection of hygienic requirements
Determine according to GB/T 5009.60.
5.10 Determination of simply supported beam impact strength
Measure according to GB/T 1043; use Type A notched specimen of Type I sample, with
the pendulum impacting energy as 4J.
6.2 Factory inspection
Factory inspection includes the items in 4.1, 4.2, and table 2 in 4.3; it can also be agreed
upon between the seller and the buyer.
6.3 Type inspection
The type inspection includes all the technical requirements in Chapter 4 in this standard.
They shall be tested at least once a year.
A type inspection shall be made in case of one of the following situations.
a) When trial identification appraisement is made for new products or old products are
transferred to another plant for production;
b) When it may affect the product properties due to major changes in, for example,
structure, material, and process after formal production;
c) When production recovers after a long-time shutdown;
d) When there are significant differences between the factory inspection results and
the last type inspection results;
e) When national quality supervision agencies require to make a type inspection.
6.4 Sampling
6.4.1 The appearance and specifications adopt single sampling inspection plan according
to GB/T 2828 and are based on general inspection level I. The acceptable quality level
AQL is 6.5, as required in Table 4. The unit of test pieces is piece.
6.5.2 The inspection of physical and mechanical properties shall be conducted on a sheet
taken from the samples at random.
Table 4
Lot range N Sample size n Acceptance number Ac Rejection number Rc
26~150 8 1 2
151~280 13 2 3
281~500 20 3 4
501~1200 32 5 6
1201~3200 50 7 8
3201~10000 80 10 11
10001~35000 125 14 15
> 35000 200 21 22
6.5 Judgment rules
For 4.1 and 4.2, it can be decided according to Table 4. In case one of the rest items fails
to meet the standard, then double samples can be taken from the original lot for
re-inspection; if it still fails to meet the standard, then this lot is deemed as unacceptable.
7 Marking, packaging, transport, and storage
7.1 Marking
Every package shall be accompanied with a certificate, which includes.
a) names of product and manufacturer;
b) product specifications;
c) date of production, lot, and net weight;
d) product trademark and inspector code;
e) adopted standard number.
7.2 Packaging
Flake sheets are packaged with gunny bags, boxes, or other materials; the mass of every
box is not more than 100kg.
Rolled sheets shall be curled and bound with bundling ropes at both ends, and then
packaged with plastic film; the mass of every box is not more than 50kg.
7.3 Transport
The product shall be free of contamination, pressure, collision, and sunshine, rain; the
package shall be intact and complete.
7.4 Storage
The product shall be stored in a dry and clean room or a warehouse at appropriate
temperature. The product shall be at least 1m away from heat source in storage.
The storage period shall not be more than two years from the date of production.
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.