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    HDPE Pipe SDR Chart — Complete Reference for IS 4984:2016

    The definitive SDR reference chart for HDPE pipes as per IS 4984:2016. All 10 SDR classes mapped to pressure ratings for PE63, PE80, and PE100 material grades.

    3 min read Updated July 2026

    SDR (Standard Dimension Ratio) is the single most important number for specifying HDPE pipe wall thickness and pressure capacity. SDR = Outside Diameter ÷ Minimum Wall Thickness. A lower SDR number means a thicker wall and a higher pressure rating.

    The Golden Rule

    Lower SDR = Thicker Wall = Higher Pressure. SDR 41 is the thinnest wall (lowest pressure). SDR 6 is the thickest wall (highest pressure).

    Complete SDR to PN Mapping — IS 4984:2016

    This is the master reference table. The pressure rating (PN) depends on both SDR and material grade. Data sourced from IS 4984:2016 and the BIS Product Manual PM/IS 4984/2/June 2022 Annex A.

    SDRPN (PE 63)PN (PE 80)PN (PE 100)Typical Application
    SDR 41PN 2PN 2.5—Very low pressure gravity flow
    SDR 33PN 2.5PN 3.2PN 4Low pressure distribution
    SDR 26PN 3.2PN 4PN 5Rural water supply gravity systems
    SDR 21PN 4PN 5PN 6Light pressure irrigation, sprinkler laterals
    SDR 17PN 5PN 6PN 8Standard agricultural mains, sprinkler mainlines
    SDR 13.6PN 6PN 8PN 10Town water supply, medium pressure
    SDR 11PN 8PN 10PN 12.5High pressure water supply, borewell
    SDR 9PN 10PN 12.5PN 16Municipal and industrial supply
    SDR 7.4PN 12.5PN 16PN 20High pressure industrial
    SDR 6—PN 20PN 20Very high pressure (PE 80/100 only)

    Wall Thickness by SDR (110mm OD pipe)

    Lower SDR = thicker wall = higher pressure capacity. Green bars are the strongest.

    0 mm5 mm10 mm18 mmSDR 7.4SDR 9SDR 11SDR 13.6SDR 17SDR 21SDR 26SDR 33SDR 41

    Relative Wall Thickness at a Glance

    Each ring represents the pipe wall relative to the outer diameter. Thicker ring = more material = higher pressure.

    SDR 7.4Thickest
    SDR 11
    SDR 17Standard
    SDR 26
    SDR 41Thinnest
    Higher pressure capacity—Lower pressure capacity

    Wall Thickness by Size — PE100 SDR 11 (Most Common)

    OD (mm)Wall Thickness (mm)SDRPressure (PE 100)Weight (kg/m)
    202.011PN 12.50.12
    252.311PN 12.50.17
    322.911PN 12.50.28
    403.711PN 12.50.44
    504.611PN 12.50.68
    635.811PN 12.51.08
    756.811PN 12.51.46
    908.211PN 12.52.12
    11010.011PN 12.53.14
    12511.411PN 12.54.08
    14012.711PN 12.55.08
    16014.611PN 12.56.67
    20018.211PN 12.510.4
    25022.711PN 12.516.2
    31528.611PN 12.525.7
    40036.311PN 12.541.4
    50045.411PN 12.564.7
    63057.211PN 12.5102.6

    How to Calculate SDR

    SDR = Outside Diameter (OD) ÷ Minimum Wall Thickness. For example: A 110mm OD pipe with 10mm wall thickness has SDR = 110 ÷ 10 = SDR 11.

    Wall Thickness Comparison — 110mm OD Pipe at Different SDRs

    SDRWall ThicknessPN (PE 80)PN (PE 100)Weight (kg/m)
    SDR 264.2 mmPN 4PN 51.39
    SDR 215.3 mmPN 5PN 61.74
    SDR 176.6 mmPN 6PN 82.14
    SDR 13.68.1 mmPN 8PN 102.59
    SDR 1110.0 mmPN 10PN 12.53.14
    SDR 912.3 mmPN 12.5PN 163.78
    SDR 7.414.9 mmPN 16PN 204.44

    BIS Size Groups (IS 4984:2016)

    The BIS Product Manual PM/IS 4984/2/June 2022 categorises pipe sizes into 5 groups for certification purposes:

    GroupDN Range (mm)Typical Form
    Group I16 to 180Coils (50m, 100m) or straight lengths
    Group II200 to 500Straight lengths (6m, 12m)
    Group III560 to 1000Straight lengths (6m, 12m)
    Group IV1200 to 2000Straight lengths (custom)
    Group V2250 & 2500Straight lengths (custom order)

    Group V (DN 2250 and DN 2500) was added in the June 2022 revision of the BIS Product Manual. The January 2019 edition only covered sizes up to DN 2000mm across 4 groups.

    Frequently Asked Questions

    What does SDR mean on HDPE pipe?

    SDR stands for Standard Dimension Ratio. It is the ratio of pipe outside diameter (OD) to minimum wall thickness. SDR = OD ÷ Wall Thickness. A lower SDR means thicker walls and higher pressure capacity.

    What is the most common SDR for water supply?

    SDR 11 is the most commonly specified SDR for municipal water supply (PN 10 for PE80, PN 12.5 for PE100). For agricultural sprinkler mainlines, SDR 17 (PN 6 for PE80) is standard.

    How many SDR classes are there in IS 4984?

    IS 4984:2016 defines 10 SDR classes: SDR 41, 33, 26, 21, 17, 13.6, 11, 9, 7.4, and 6.

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