Spiraltherm Graphite 9594

Spiraltherm Graphite 9594

Spiraltherm Graphite 9594


Spiraltherm Graphite H 9594 is a flange seal made from a V-shaped profiled stainless steel tape with spiral-wound graphite middle layer (purity >99.85 %). The ends of the stainless steel tape are spot-welded.


  • Suitable for nuclear applications
  • High purity graphite

Operating range

Pressure: p = 400 bar
  • Continuous operation:
    t = -200 ... +550 °C
  • Inert environment: Contact us to discuss higher temperatures
Recommended surface roughness:
Rz = 12.5 ... 50 μm

Chemical resistance: pH = 0 … 14

Sealing parameters
AD Directive B7
  • k0 x KD = 65 x bd
  • k1 = 1,4 x bd
  • Gasket factor: m = 2.5
  • Minimum surface pressure:
    y = 10,000 psi, y = 70 MPa


  • Filler material:
    99.85 % pure graphite
  • Metal spiral:
    1.4541 (321) or 1.4571 (316 Ti)
  • 9594/...R variants:
    Sulfur content <100 ppm, soluble sulfates <100 ppm
Other materials upon request

Standards and approvals

  • BAM (on request)


9584/... (98 % pure graphite filler)
9594/... (99,85 % pure graphite filler)
9594/...R (graphite filler with low sulfur < 200 ppm and water soluble sulfate < 100 ppm cont)
9584/...TZ (with additional PTFE-sealing zone, T < 280 °C)
9594/...TZ (with additional PTFE-sealing zone, T < 280 °C)
9595/... (pure PTFE filler, T < 280 °C)
9596/... (mica filler, T < 900 °C)

Forms of supply

for tongue-and-groove flanges - 9594/NF (standard), 9594/NFR (sulfur content <100 ppm)
for tongue-and-groove flanges, with compression curve - 9594/NFS (standard), 9594/NFSR (sulfur content <100 ppm)
for projection and recess flanges - 9594/VR (standard), 9594/VRR (sulfur content <100 ppm)
for projection and recess flanges, with inner ring - 9594/VRI (standard), 9594/VRIR (sulfur content <100 ppm)
for raised-face flanges, with outer ring - 9594/GA (standard), 9594/GAR (sulfur content <100 ppm)
for raised-face flanges, with inner and outer ring - 9594/GIA (standard), 9594/GIAR (sulfur content <100 ppm)
Manhole Gasket:
9594/MH (standard), 9594/MHR (sulfur content <100 ppm)

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Technical Datasheet H Spiraltherm Graphite TDB 9594