This standard specifies the product classification, dimension, function, requirements, test methods, inspection rules as well as marking, package, transportation and storage of high density polyethylene sheathing compounds used for bridge cables.
This standard is applicable to high density polyethylene sheathing plastics prepared with high density polyethylene resin as the major raw material, added with additive of modifier, antioxygen, light stabilizer, carbon black or pigment and after mixing, plastifying and prilling. The high density polyethylene sheathing plastics are used for bridge stay cables and hanger rod cables. The cable sheathing compounds used for other cable structures could be used accordingly.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, all subsequent modifications (excluding correction contents) or revisions are not applicable to this standard. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document is applicable to these specifications.
GB/T 1033--1986 Test Method for Density and Relative Density of Plastics (eqv ISO/DIS 1183:1984)
GB/T 1040--2006 Plastics - Determination of Tensile Properties
GB/T 1043--1993 Plastics Determination of Charpy Impact Strength of Rigid Materials (neq ISO 179:1982)
GB/T 1633--2000 Plastics--Thermoplastic Materials--Determination of Vicat Softening Temperature (VST) (idt ISO 306:1994)
GB/T 1842--1999 Test Method for Environmental Stress-Cracking of Polyethylene Plastics (egv ASTMD1693:1997)
GB/T 2411-1980 Plastics--Shore Hardness Test (egv ISO 868:1978)
GB/T 2828 Sampling Procedures for Inspection by Attributea
GB/T 2951.5-1997 Common Test Methods for Insulating and Sheathing Materials of Electric Cables--Part 2: Methods Specific to Elastomeric Compounds Section One--Ozone Resistance Test--Hot Set Test--Mineral Oil Immersion Test (idt IEC 811-2-1:1986)
GB/T 3682-2000 Determination of the Melt Mass-Flow Rate (MFR) and the Melt Volume-Flow Rate (MVR) of Thermoplastics (idt ISO 1133:1997)
GB/T 5470-1985 Test Method for Brittleness Temperature of Plastics by Impact
GB/T 7141-1992 Plastics-Methods of Exposure to Thermal Air (neq JIS K7212:1977)
GB/T 8427-1998 Textiles-Tests for Colour Fastness Colour Fastness to Artificial Light: Xenon Arc Fading Lamp Test (eqv ISO 105 B02:1994)
GB/T 9341-2000 Plastics--Determination of Flexural Properties (idt ISO 178:1993)
GB/T 9352-1988 Compression Moulding of Test Specimens of Thermoplastic Materials (neg ISO 1265:1979)
GB 15065-1994 Black Polyethylene Compounds for Wire and Cable (neg IEC 502:1983)
GB/T 16422.3-1997 Plastics-Methods of Exposure to Laboratory Light Sources-Part 3: Fluorescent UV Lamps (eqv ISO 4892-3:1994)
3 Product Classification, Dimension and Function
3.1 Classification
They are divided into the following three types:
Ordinary type PH-black, ordinary type PC-color and strong UV-resistant type NQ.
3.2 Dimension
They are generally φ4mm×3mm cylindrical particles or particles with volume equivalent square.
3.3 Function
The ordinary type PH-black is applicable to black sheathing in the inner-layer of cable in any region. The ordinary type PC-color is applicable to color sheathing in the outer-layer of cable in general region. The strong UV-resistant type NQ is applicable to the color sheathing in the outer-layer of cable in the low latitude and strong ultraviolet radiation region.
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