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GB/T 24456-2009 English PDF (GBT24456-2009)

GB/T 24456-2009 English PDF (GBT24456-2009)

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GB/T 24456-2009: High-density polyethylene silicone plastic duct
GB/T 24456-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.30; 23.040.20
G 33
High-density Polyethylene Silicore Plastic Duct
高密度聚乙烯硅芯管
ISSUED ON: OCTOBER 15, 2009
IMPLEMENTED ON: MARCH 1, 2010
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Structure and Classification ... 5 
4 Materials ... 6 
5 Requirements ... 7 
6 Test Methods ... 10 
7 Inspection Rules ... 13 
8 Marking, Packaging, Transportation and Storage ... 15 
Appendix A (normative) Requirements for Special Joints of Silicore Ducts ... 17 
Appendix B (normative) Test Method for Out-of-roundness ... 19 
Appendix C (normative) Test Method for Static-state Friction Coefficient by Flat
Plate Method ... 20 
Appendix D (normative) Test Method for Dynamic-state Friction Coefficient by
Round Drum Method ... 22 
Appendix E (normative) Test Method for Cold Bending Performance ... 25 
Bibliography ... 26 
High-density Polyethylene Silicore Plastic Duct
1 Scope
This Standard specifies the structure and classification, materials, requirements, test
methods, inspection rules, marking, packaging, transportation and storage of high-
density polyethylene silicore plastic ducts (hereinafter referred to as “silicore ducts”).
This Standard is applicable to silicore ducts and supporting duct fittings used for the
protection of optical cables and power cables, which are laid in environments, such as:
underground direct burial, pipelines and trenches, etc.
This Standard is not applicable to silicore ducts and supporting duct fittings used for
the protection of optical cables and power cables, which are directly exposed outdoor
to the sunlight and with an air blowing pressure greater than 1.2 MPa.
2 Normative References
Through the reference in this Standard, the clauses of the following documents
become clauses of this Standard. In terms of references with a specified date, all the
subsequent modification sheets (excluding the corrected content) or revised versions
are not applicable to this Standard. However, the various parties that reach an
agreement in accordance with this Standard are encouraged to explore the possibility
of adopting the latest version of these documents. In terms of references without a
specified date, the latest version is applicable to this Standard.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods (GB/T 191-2008, ISO
780:1997, MOD)
GB/T 1842-2008 Plastics - Test Method for Environmental Stress-cracking of
Polyethylene
GB/T 2411 Plastics and Ebonite - Determination of Indentation Hardness by Means of
A Durometer (shore hardness)
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attribute - Part 1: Sampling
Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection
GB/T 2918-1998 Plastics - Standard Atmospheres for Conditioning and Testing
GB/T 3682-2000 Determination of the Melt Mass-flow Rate (MFR) and the Melt
Volume-flow Rate (MVR) of Thermoplastics
GB/T 6111-2003 Thermoplastics Pipes for the Conveyance of Fluids - Resistance to
Figure 1 -- Schematic Diagram of Cross-sectional Structure of Silicore Duct
3.2 Product Classification
3.2.1 By structure, it may be classified into:
---Both the inner and outer walls are smooth solid-walled silicore ducts:
represented by the Latin letter S;
---Ribbed silicore duct with smooth outer wall and longitudinal ribbed inner wall:
represented by the Latin letter R1;
---Ribbed silicore duct with ribbed outer wall and smooth inner wall: represented
by the Latin letter R2;
---Ribbed silicore duct with ribbed outer and inner walls: represented by the Latin
letter R3.
3.2.2 By color, it may be classified into:
---Single-color silicore duct whose outer layer is a single color and without color
stripes;
---Color-striped silicore duct whose outer layer is inlaid with color stripes of other
colors.
3.3 Product Marking
The product marking of silicore ducts is composed of name, standard No., sequence
number, material, specifications, duct wall structure and outer-layer color code, in
which, the material is represented by PE-HD; the specifications are shown in Table 2,
for example, 40/33; the duct wall structure is shown in 3.2.1: S---solid-walled duct,
which may usually be omitted, R1, R2, R3---ribbed ducts; the outer-layer color code is
shown in Table 1.
An example of product marking: 40/33 black silicore duct with smooth inner and outer
walls in compliance with GB/T 24456 shall be marked as:
Silicore duct GB/T 24456 PE-HD 40/33 BK
4 Materials
The main material for the production of silicore ducts shall be high-density polyethylene
extrusion grade resin that complies with the stipulations of GB/T 11116. Its melt mass-
flow rate MFR (190/2.16) is 0.1 g/10 min ~ 1.0 g/10 min. Under the condition of
ensuring compliance with the requirements of Chapter 5 of this Standard, no more than
10% of the company’s clean recycled materials may be used.
Tightly put a silicore duct sample (length: 100 mm) on a metal rod with an appropriate
outer diameter; place it directly under the Type-D Shore Hardness Tester. In
accordance with the method specified in GB/T 2411, read the instantaneous hardness
of the test as the measurement result. Read 5 times in total; take the arithmetic mean
value as the measurement result.
6.5.2 Inner wall friction coefficient
6.5.2.1 See Appendix C for the static-state inner wall friction coefficient test method.
6.5.2.2 See Appendix D for the dynamic-state inner wall friction coefficient test method.
6.5.3 Tensile yield strength and elongation at break
The shape of the sample shall comply with the stipulations of Type-2 in GB/T 8804.3-
2003. Through the method of punching, cut 3 samples from the duct. The test shall be
conducted in accordance with the steps in GB/T 8804.1-2003. The test rate is (100 ±
5) mm/min. Take the arithmetic mean value of 3 valid tests as the test result.
NOTE: when there is no obvious yield point, take the maximum tensile strength as the test
result.
6.5.4 Maximum traction load
Take three intact silicore duct samples with a length of (200 ± 5) mm. Both ends of the
sample shall be cut straight and flat. Use a special fixture to clamp the sample on the
testing machine at a tensile speed of (450 ± 10) mm/min, until the sample yields. Then,
read the yield load as the test result. If the sample breaks at the edge of the fixture,
then, the test is invalid, and the sample shall be replaced. Take the arithmetic mean
value of three valid tests as the test result.
6.5.5 Cold bending performance
See Appendix E for the cold bending performance.
6.5.6 Ring stiffness
Take three intact silicore duct samples with a length of (200 ± 1) mm. The compression
speed is (5 ± 1) mm/min; the amount of compression is 5% of the inner diameter, which
shall be performed in accordance with the stipulations of GB/T 9647-2003.
6.5.7 Recovery rate
Take three intact silicore duct samples with a length of (200 ± 1) mm. Both ends of the
sample shall be cut straight and flat. Mark both ends of the sample diameter; measure-
take the outer diameter at the mark as the initial outer diameter. In accordance with the
stipulations of GB/T 9647-2003, place the sample between two parallel pressing plates.
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