IS 8008 (Part 4) : 2000Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 4: Specific Requirements for Reducers
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IS 8008:2000 (Part 4) is the Indian Standard (BIS) for injection moulded/machined high-density polyethylene (hdpe) fittings for potable water supplies, part 4: specific requirements for reducers. This Indian Standard (Part 4) specifies the particular requirements for injection moulded or machined high-density polyethylene (HDPE) reducers intended for use in potable water supply pipelines. It covers material, dimensions, performance tests, and marking, and is intended to be used in conjunction with IS 8008 (Part 1).
Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 4: Specific Requirements for Reducers
ISO 4427-3:2019ISO (International Organization for Standardization)
HighCurrent
Plastics piping systems for water supply, and for drainage and sewerage under pressure — Polyethylene (PE) — Part 3: Fittings
Specifies requirements for injection-moulded, fabricated, and machined PE fittings for potable water supply systems.
EN 12201-3:2011+A1:2012CEN (European Committee for Standardization), Europe
HighCurrent
Plastics piping systems for water supply, and for drainage and sewerage under pressure - Polyethylene (PE) - Part 3: Fittings
European standard for PE fittings for pressure water applications, closely harmonized with ISO 4427-3.
AS/NZS 4129:2020Standards Australia/Standards New Zealand
HighCurrent
Fittings for polyethylene (PE) pipes for pressure applications
Specifies requirements for various types of PE fittings, including injection-moulded, for use in pressure applications.
ASTM D3261-21ASTM International, USA
MediumCurrent
Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing
Focuses specifically on butt fusion fittings, whereas IS 8008 also covers other injection-moulded and machined types.
Key Differences
≠IS 8008:2000 references material grades PE 63, PE 80, and PE 100. Modern international standards like ISO 4427-3:2019 focus almost exclusively on the higher performance PE 80 and PE 100 materials, as PE 63 is largely obsolete for pressure water applications.
≠IS 8008:2000 specifies MFR (Melt Flow Rate) for characterizing polymer flow. Modern ISO/EN standards have transitioned to using MVR (Melt Volume-Flow Rate) as it is considered more accurate and less dependent on material density.
≠The Indian standard is dated 2000 and lacks requirements for newer material performance tests, such as Resistance to Slow Crack Growth (SCG), which are mandatory in recent versions of ISO 4427-3 and EN 12201-3 to ensure higher long-term durability.
≠IS 8008 specifies a hydrostatic strength test at 80°C for 48 hours for type testing, whereas ISO 4427-3 requires a more stringent 165-hour test at 80°C to better assess long-term performance under stress.
Key Similarities
≈All standards mandate that the base material must be High-Density Polyethylene (HDPE) compound, suitable for potable water contact and compliant with relevant toxicology regulations.
≈Both IS 8008 and its international counterparts specify very similar requirements for carbon black content (around 2.0-2.5%) and dispersion grade (≤3) for black fittings to ensure adequate UV protection and material homogeneity.
≈The core principle of ensuring fitting performance through long-term hydrostatic strength testing is fundamental to both the Indian and international standards, linking material grade (e.g., PE 100) to a specific stress resistance over time.
≈All standards require clear and permanent marking on fittings, including manufacturer's identification, nominal size, material grade (e.g., PE 100), and pressure rating (SDR or PN), to ensure traceability and correct application.
Parameter Comparison
Parameter
IS Value
International
Source
Carbon Black Content (for black fittings)
2.25 ± 0.25 % by mass
2.0 % to 2.5 % by mass
ISO 4427-3:2019
Oxidation Induction Time (OIT @ 200°C)
Minimum 20 minutes
Minimum 20 minutes
EN 12201-3:2011
Density of Base Compound
≥ 930 kg/m³ at 27°C
≥ 930 kg/m³ at 23°C (for PE80/PE100)
ISO 4427-3:2019
Hydrostatic Strength (PE 100, 80°C)
≥ 4.6 MPa for 48 hours (Type Test)
≥ 4.0 MPa for 165 hours
ISO 4427-3:2019
Melt Flow Variation (Fitting vs. Raw Material)
MFR deviation ≤ ±30%
MVR deviation ≤ ±20%
ISO 4427-3:2019
Pigment/Carbon Black Dispersion Grade
≤ 3
≤ 3
AS/NZS 4129:2020
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Material Density Minimum0.940 g/cm³ at 27°C
Melt Flow Rate (MFR) Tolerance±20% of the value specified for the raw material
Oven Test Temperature110 ± 2 °C
Hydrostatic Stress for PE 80 at 80°C for 165h test4.0 MPa
Colour of FittingBlack
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of End Caps
Table 2 - Hydrostatic Characteristics of the Fittings
Key Clauses
Clause 3 - Material
Clause 5 - Geometrical Characteristics
Clause 6 - Physical and Mechanical Characteristics