Leader Spiral Wound GasketsHigh Integrity SPW Gaskets
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Leader Spiral Wound Gasket Type SRI


Spiral Wound Gaskets (SWG’s) are widely used as high integrity and sustainable gaskets. The sealing element is manufactured from preformed, V-shaped metallic windings with intermediate soft sealing fillers. Most used filler materials are Graphite and PTFE or LeaderTHERM NXT 1000 (high temp. modified Phlogopite). Due to the gasket construction, SWG’s offer high compressibility and recovery. Leader Style SRI SWG’s are provided with an innerand outer guide ring. These gaskets are suitable for ASME B16.5 raised faced flanges up to 2500 lbs and for EN/DIN flanges up to PN400.


Product Data SheetMetallic materials


(Petro-) Chemical Industry, Steam, On- and Offshore exploration, pipeline systems, pressure vessels and exchangers.


Universal gasket. Blow out resistant!

Chemical Compatiblity

Spiral Wound Gaskets can be used in a wide variety of media, i.e. a pH range varying from 0-14. Application/ compatibility guide is available on request.

Delivery Options

Standard style SRI gaskets are normally manufactured according to particular customer drawings, or by given sizes. Gaskets can be manufactured in a thickness of 2,5/3,2/4,5/6,4/7,2 mm. Different materials are available.


Spiral Wound Gaskets "SRI" can be used in a wide variety of media, temperature acc. to used material(table of materials); standard SS316L - 100 °C up to 550 °C.

Approvals & Certificates

  • BAM
  • TA-Luft
  • Firesafe API 6FB
  • BAM
  • TA-Luft

Sealing Characteristics

  • low leak rate
Technical Data
max Temperature [°C]See material table below
max Pressure [bar]350
Minimum initial stress [DIN E 2505 part 2] [N/mm2]50
Maximum initial stress [DIN E 2505 part 2] [N/mm2]300
Y- Value [psi]10000
min Seating stress [Qmin(L 0,01), mg/(s*m)] at RT 40 bar [N/mm2]33
Gasket required flange roughness [Ra micron]3,2-6,3
max Seating stress [Qsmax bei RT EN13555] [n/mm2]300
Relaxation PQR (30 MPA 150°C) [%]0.92
Residual seating stress , [QA=40 MPA,Qmin(L 0,01), mg/(s*m)] bei RT 40 bar [N/mm2]10
ROTT [Gb]926
ROTT [a]0.341
ROTT [Gs"]2.9
min Temperature [°C]See material table below

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