Basic Performance
Basic Properties of Pipe Fitting Raw Materials
| No. | Property | Unit | Requirement | Test Parameters | Test Method |
| 1 | Density | Kg/m3 | ≥930 (Base resin) | 23℃ | Method D in GB/T1033-1986, specimen preparation according to 3.3.1 in GB/T1845.1-1999 |
| 2 | Melt Mass-Flow Rate (MFR) | g/10min | 0.2~1.4, and the maximum deviation shall not exceed ±20% of the nominal value of the compound | 190℃，5kg | GB/T3682-2000 |
| 3 | Thermal Stability (Oxidation Induction Time) |
min | >20 | 200℃ | GB/-T17391-1998 |
| 4 | Volatile Matter Content | mg/kg | ≤350 | Annex C | |
| 5 | Moisture Contentb | mg/kg | ≤300 | ASTMD4019:1994a | |
| 6 | Carbon Black Contentc (Mass Fraction) |
% | 2.0 ~ 2.5 | GB/T13021-1991 | |
| 7 | Carbon Black Dispersionc | Grade | ≤3 | GB/T18251-2000 | |
| 8 | Pigment Dispersiond | Grade | ≤3 | GB/T18251-2000 | |
| 9 | Resistance to Gas Components | h | ≥20 | 80℃，2MPa (Hoop Stress) |
Annex D |
| Resistance to Rapid Crack Propagation (RCP) | |||||
| 10 | Full Scale (FS) Test: dn≥250mm Or S4 Test: Pipe wall thickness ≥15mm |
Mpa | Critical pressure of full scale test PC,FS≥1.5XMOP) |
0℃ | ISO13478:1997 |
| Mpa | Critical pressure of S4 test PC,S4≥P/2.4-0.072e |
0℃ | GB/T19280-2003 | ||
| 11 | Resistance to Slow Crack Growth (en≥5mm) | h | 165 | 8℃，0.9MPa (Test Pressure)f 80℃，0.92MPa (Test Pressure)g |
GB/T18476-2001 |
| a Non-black compounds shall meet the weathering resistance requirements in Table 6. b Moisture content is measured only when the measured volatile matter content does not meet the requirements. In case of arbitration, the measurement result of moisture content shall be used as the judgment basis. c Applicable only to black compounds. d Applicable only to non-black compounds. e If the S4 test result does not meet the requirements, the full scale test can be performed again, and the result of the full scale test shall be used as the final basis. f PE80, SDR11 test parameters. g PE100, SDR11 test parameters. |
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Types of Pipe Fitting Performance
| No. | Project | Project | ||
| 1 | Thermal stability (200℃), min | >20min | ||
| 2 | Short-term hydrostatic strength | Pipe fitting no damage | 20℃ | 9.0MPa ductile failure time>100h |
| 80℃ | 4.0MPa brittle failure time>165h | |||
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No leakage at welds |
4.0MPa failure time>1000h | |||
| 3 | Heating expansion and contraction | The change in outer diameter and length of the pipe fitting shall not exceed ±5%, and no obvious change in the shape of the pipe fitting is allowed | ||