Spiraldichtung ohne Innen- und Außenring, Graphitfüllung, Profil SD01, WS 1.4541/Graphit, Dichtungsdicke 3.5 mm, Rev. 00

Type of gasket: Spiralwound gasket
Gasket manufacturer: IDT Industrie- und Dichtungstechnik GmbH
Gasket label: Spiraldichtung ohne Innen- und Außenring, Graphitfüllung, Profil SD01, WS 1.4541/Graphit, Dichtungsdicke 3.5 mm, Rev. 00
maximum temperature: 400 °C
maximum pressure: 80 bar

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Gasket thickness under load eG

Gasket thickness eG / mm
Gasket stress / MPa 20°C 200°C 400°C
0 3.46 3.505 3.5
1 3.387 3.413 3.41
20 3.274 3.249 3.257
30 3.18 2.913 2.858
40 2.741 2.647 2.693
50 2.618 2.526 2.599
60 2.525 2.446 2.523
80 2.404 2.333 2.41
100 2.322 2.263 2.33
120 2.27 2.205 2.268
140 2.227 2.158 2.224
160 2.187 2.125 2.187
180 2.155 2.097 2.157
200 2.131 2.074 2.136

Gasket deformation under load ΔeG

Gasket deformation ΔeG / mm
Gasket stress / MPa 20°C 200°C 400°C
0 0.000 0.000 0.000
1 0.073 0.092 0.090
20 0.186 0.256 0.243
30 0.280 0.592 0.642
40 0.719 0.858 0.807
50 0.842 0.979 0.901
60 0.935 1.059 0.977
80 1.056 1.172 1.090
100 1.138 1.242 1.170
120 1.190 1.300 1.232
140 1.233 1.347 1.276
160 1.273 1.380 1.313
180 1.305 1.408 1.343
200 1.329 1.431 1.364

Maximum allowable gasket stress QSmax

Temperature / °C QSmax / MPa
20 200
200 200
400 200

Modulus of elasticity EG

Modulus of elasticity EG / MPa
Gasket stress / MPa 20°C 200°C 400°C
20 1531 1554 2041
30 1419 1435 1623
40 1781 2233 2973
50 2587 2808 3771
60 2926 3711 5278
80 3630 4676 5676
100 4258 7007 8154
120 7543 8226 7264
140 7792 9372 11595
160 8184 11682 8668
180 10148 11581 9264
200 11154 14354 14051

Creep/relaxation factor PQR

Creep/relaxation factor PQR
Gasket stress / MPa 20°C 200°C 400°C
30 0.96 0.79
50 1 0.92 0.88
90 0.95
100 1 1
200 1 0.98 0.98

Minimum required gasket stress in assembly Qmin(L)

Minimum required gasket stress Qmin(L) / MPa
Leakage rate / mg/m/s 16 bar 40 bar 80 bar
10⁰ 20 31 31
10⁻¹ 34 41 49
10⁻² 48 58 68
10⁻³ 73 91 108
10⁻⁴ 130 156 173

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

Minimum required gasket stress at internal pressure 16 bar

Minimum required gasket stress QSmin(L) / MPa
Tightness class 80 MPa 100 MPa 160 MPa 200 MPa
10⁰ 11 11 11 11
10⁻¹ 11 11 11 11
10⁻² 11 11 11 11
10⁻³ 43 24 16 11
10⁻⁴ 73 46

Minimum required gasket stress at internal pressure 40 bar

Minimum required gasket stress QSmin(L) / MPa
Tightness class 60 MPa 100 MPa 120 MPa 150 MPa 200 MPa
10⁰ 31 31 31 31 31
10⁻¹ 31 31 31 31 31
10⁻² 42 31 31 31 31
10⁻³ 62 46 36 31
10⁻⁴ 81

Minimum required gasket stress at internal pressure 80 bar

Minimum required gasket stress QSmin(L) / MPa
Tightness class 120 MPa 150 MPa 200 MPa
10⁰ 31 31 31
10⁻¹ 31 31 31
10⁻² 31 31 31
10⁻³ 66 47 35
10⁻⁴ 95

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 Spiraldichtung ohne Innen- und Außenring, Graphitfüllung, Profil SD01, WS 1.4541/Graphit, Dichtungsdicke 3.5 mm, Rev. 00 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