Flachdichtung SIGRAFLEX® MF mit Innenbördel, Profil FD10, WS 3870 IB; Dichtungsdicke 2 mm, Rev. 01

3870FD10
Core of this gasket consists of a graphite seal with stainless steel insert.The gasket is covered with a thin stainless steel foil (0,05 mm) on both side. This is then covered with a thin PTFE layer (0,05 mm). The gasket models also have an inner eyelet. The system demonstrates excellent sealing properties and can also be used as an alternative for PTFE sealing systems.
Article Number
3870FD10
Material
3870
Profile
FD10
FD10
Type of gasket: Sheet gasket with inner eyelet
Gasket manufacturer: IDT Industrie- und Dichtungstechnik GmbH
Gasket label: Flachdichtung SIGRAFLEX® MF mit Innenbördel, Profil FD10, WS 3870 IB; Dichtungsdicke 2 mm, Rev. 01
maximum temperature: 300 °C
maximum pressure: 80 bar

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Gasket thickness under load eG

Gasket thickness eG / mm
Gasket stress / MPa 20°C 150°C 300°C
1 1.94 1.946 1.911
20 1.604 1.61 1.59
30 1.505 1.509 1.488
40 1.44 1.425 1.408
50 1.394 1.373 1.349
60 1.361 1.328 1.305
80 1.308 1.267 1.238
100 1.268 1.225 1.183
120 1.234 1.188 1.135
140 1.212 1.15
160 1.188
180 1.168
200 1.145

Gasket deformation under load ΔeG

Gasket deformation ΔeG / mm
Gasket stress / MPa 20°C 150°C 300°C
1 0.000 0.000 0.000
20 0.336 0.336 0.321
30 0.435 0.437 0.423
40 0.500 0.521 0.503
50 0.546 0.573 0.562
60 0.579 0.618 0.606
80 0.632 0.679 0.673
100 0.672 0.721 0.728
120 0.706 0.758 0.776
140 0.728 0.796
160 0.752
180 0.772
200 0.795

Maximum allowable gasket stress QSmax

Temperature / °C QSmax / MPa
20 200
150 140
300 120

Modulus of elasticity EG

Modulus of elasticity EG / MPa
Gasket stress / MPa 20°C 150°C 300°C
20 506 614 624
30 704 780 680
40 995 964 960
50 1186 1344 1300
60 1534 1469 1640
80 2155 1971 2009
100 2291 2466 2375
120 2450 2728 2606
140 3106 3079
160 3054
180 3266
200 3358

Creep/relaxation factor PQR

Creep/relaxation factor PQR
Gasket stress / MPa 20°C 150°C 300°C
30 0.98 0.93 0.87
50 0.98 0.94 0.86
120 0.91
140 0.95
200 0.99

Minimum required gasket stress in assembly Qmin(L)

Minimum required gasket stress Qmin(L) / MPa
Leakage rate / mg/m/s 10 bar 40 bar 80 bar
10⁰ 5 7 21
10⁻¹ 5 11 23
10⁻² 7 13 25
10⁻³ 10 16 27
10⁻⁴ 14 18 29
10⁻⁵ 18 131 76
10⁻⁶ 37

Minimum required gasket stress in service QSmin(L) depending on initial gasket stress QA

Minimum required gasket stress at internal pressure 10 bar

Minimum required gasket stress at internal pressure 40 bar

Minimum required gasket stress at internal pressure 80 bar

Friction coefficient µG

The friction coefficient between gasket and flange surface was determined for different types of gasket materials in an ESA research project.

The gasket Flachdichtung SIGRAFLEX® MF mit Innenbördel, Profil FD10, WS 3870 IB; Dichtungsdicke 2 mm, Rev. 01 can be assigned to the categorie 3 : "Gaskets based on flexible graphite". Therefore, the following friction coefficients can be considered:

Temperature / °C Friction coefficient
20 °C 0.22