IS 14735 : 1999Unplasticized Polyvinyl Chloride (UPVC) Injection Moulded Fittings for Soil and Waste Discharge Systems for Inside and Outside Buildings Including Ventilation and Rain Water Systems
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IS 14735:1999 is the Indian Standard (BIS) for unplasticized polyvinyl chloride (upvc) injection moulded fittings for soil and waste discharge systems for inside and outside buildings including ventilation and rain water systems. This standard specifies the requirements for injection-moulded unplasticized polyvinyl chloride (UPVC) fittings intended for use in soil, waste, and rainwater drainage systems. It covers material properties, dimensions, performance characteristics like impact strength and heat reversion, testing methods, and marking for fittings used in non-pressure gravity flow applications inside and outside buildings.
Unplasticized Polyvinyl Chloride (UPVC) Injection Moulded Fittings for Soil and Waste Discharge Systems for Inside and Outside Buildings Including Ventilation and Rain Water Systems
! Proper jointing using solvent cement (as per IS 14182) is critical for maintaining the integrity of the duct line and preventing ingress of soil or water.
! The standard specifies grey or white as standard colors, but other colors can be used by agreement, which is useful for utility identification.
! The impact strength test is performed at 0°C, reflecting the need for toughness during handling and installation in colder conditions.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
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International Equivalents
Similar International Standards
EN 1329-1:2014+A1:2018CEN (European Committee for Standardization), Europe
HighCurrent
Plastics piping systems for soil and waste discharge (low and high temperature) within the building structure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes, fittings and the system
Covers PVC-U fittings for soil and waste discharge systems within buildings, a direct overlap with the core scope of IS 14735.
BS EN 1329-1:2014+A1:2018BSI (British Standards Institution), United Kingdom
HighCurrent
Plastics piping systems for soil and waste discharge (low and high temperature) within the building structure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes, fittings and the system
The UK's direct adoption of the European standard, EN 1329-1, making its scope identical.
ASTM D2665-20ASTM International, USA
MediumCurrent
Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings
Specifies requirements for PVC Drain, Waste, and Vent (DWV) fittings, aligning with the primary application of IS 14735.
AS/NZS 1260:2017Standards Australia / Standards New Zealand, Australia/New Zealand
HighCurrent
PVC-U pipes and fittings for drain, waste and vent applications
Covers PVC-U fittings for drain, waste, and vent (DWV) applications, matching the scope of the Indian Standard.
Key Differences
≠IS 14735 permits the use of lead-based stabilizers in the PVC compound, whereas EN 1329-1 and other modern standards heavily restrict or ban lead, mandating alternatives like calcium-zinc or tin-based stabilizers.
≠The thermal cycling test in EN 1329-1 is more stringent, often requiring a higher number of cycles between high (e.g., 90-95°C) and low (e.g., 10-20°C) temperatures to assess joint performance, compared to the less dynamic tests in IS 14735.
≠Impact strength testing methodologies differ. IS 14735 uses a simple pass/fail based on a set number of failed samples, while EN 1329-1 uses a more statistically robust 'round-the-clock' method to determine a True Failure Rate (TFR).
≠Marking requirements in EN 1329-1 include specific application area codes (e.g., 'B' for use inside the building and attached to the outside) which are not present in the marking scheme of IS 14735.
Key Similarities
≈All standards specify unplasticized polyvinyl chloride (UPVC or PVC-U) as the primary material for manufacturing the fittings.
≈The fundamental application scope is identical: non-pressure systems for conveying soil, waste, and rainwater inside and outside of buildings.
≈A minimum Vicat Softening Temperature (VST) is specified in all standards (typically around 79°C) to ensure the fittings maintain their structural integrity at typical service temperatures.
≈All standards mandate a watertightness test for the assembled joints, requiring them to withstand a low internal hydrostatic pressure (e.g., 0.5 bar or 5m water head) without leakage.
≈Detailed dimensional requirements and tolerances for fitting sockets and spigots are provided in all standards to ensure compatibility and effective sealing with corresponding pipes.
Parameter Comparison
Parameter
IS Value
International
Source
Vicat Softening Temperature (VST), min
≥ 79 °C
≥ 79 °C
EN 1329-1:2014
Stress Relief Test (Oven Test)
No cracking or delamination after 30/60 min at 150 °C
No cracking or blistering after 60 min at 150 °C
EN 1329-1:2014
Watertightness of Elastomeric Seal Joints (Internal Pressure)
No leakage at 0.05 MPa (0.5 bar) for 15 min
No leakage at 0.5 bar for a specified time
EN 1329-1:2014
Impact Strength at 0°C (110 mm Fitting)
Falling mass of 0.8 kg from 2.0 m height
Falling mass of 1.0 kg from 1.6 m height (TFR ≤ 10%)
EN 1329-1:2014
Density of Material
1.35 to 1.46 g/cm³
Typically falls within 1.35 to 1.56 g/cm³ (not explicitly limited in EN 1329-1 but a property of the compound)
General PVC-U properties
Resistance to Dichloromethane (DCM)
No attack on surface after 30 min at 15 °C
No attack on surface after 30 min at 15 ± 1 °C
EN 1329-1:2014
⚠ Verify details from original standards before use