High-Performance PTFE Flat Seals

Application area Almost universally usable (depending on pressure and temperature) Not... more

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Application area

Almost universally usable (depending on pressure and temperature)

Not usable in alkali metals, elemental fluorine and chlorine trifluoride at high pressures

Product specification

Pure PTFE

Non-combustible

Excellent chemical resistance

Outstanding temperature resistance

Resistance: almost universal (see exceptions)

Technical specification

Material: PTFE (polytetrafluoroethylene)

Color: white

Density: 2.14 - 2.19 g/m³ (DIN 53479-A)

Ball pressure hardness: 27 - 32 N/mm² (DIN ISO 2039-1)

Tensile strength: 22 - 30 MPa (DIN EN ISO 527-2)

Elongation at break: 250 - 400 % (DIN EN ISO 527-2)

Tensile modulus: 350 - 750 MPa (DIN 53457)

Modulus of elasticity in bending: 600 - 800 MPa (DIN 53457)

Friction coefficient: 0.1 - 0.2 (dyn. against steel, dry)

Shore hardness D: 55° - 60° (DIN 53505)

Dielectric constant: 2.0 - 2.1 at 103 Hz and 106 Hz (DIN 53483)

Volume resistivity: >10¹⁸ Ohm x cm (ASTM D 257)

Thermal conductivity: 0.23 W/m * K (DIN 52612)

Coefficient of linear thermal expansion: 10 - 16 x 10⁵/K (DIN 53752)

Oxygen index: >95 %

Water absorption: 0 % (ASTM D 570)

Temperature range: -200 to +260 °C

Melting point: +327 °C

General Information Flat seals are usually stamped as rings. For more complicated geometries,... more

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General Information

Flat seals are usually stamped as rings. For more complicated geometries, the rings are frequently cut by means of plotter or water jet. Rings are defined by the dimensions of the internal and external diameter as well as by the total thickness of the ring but often also by nominal diameter and pressure stage according to DIN 2690, 2691 (or 2692). For the purpose of harmonizing standards, these former flat seal standards are summarized in the EU standard DIN.

EN 1514-1. Still, the following sub-descriptions serve the purpose of illustrating the individual shapes: former DIN 2690: now EN 1514-1 Form IBC for smooth flanges; former DIN 2691: now EN 1514-1 Form TG for flanges with groove and tongue.

Advantages compared with other sealing elements:

symmetrical cross section, simple compact design, easy installation, wide selection of materials, grooving not required

Most common application: Flange sealing against liquid or gaseous media; static or quasistatic applications only.

Further applications: Housing and cover sealings.

Method of operation: The flat seal is axially pressed when mounting. The axial press force has to be greater than the sum of all radially acting forces to eliminate the risk of leakage. Cross-sectional leakage (the leakage diffused through the sealing material) is minimized by the selection of the right material. An optimal grouting of the flat seal prevents surface leakage, i.e. leakage occurring between flange and seal.

Materials for special requirements:

These flat seals are especially suited for use in processes that must comply with TA-Luft requirements.

Form IBC for smooth flanges: NW 10 to 200, PN 2.5 to 63

Form TG for flanges with groove and tongue: NW 10 to 200, PN 10 to 160

Manufacturing: according to the latest standards, with an optimal tool park, for quick and flexible handling, the traceability of materials is guaranteed, all parts go through a quality check before packaging.

Item	Design¹	Innen-Ø mm	Außen-Ø mm	Höhe mm	NW mm	PN bar	Einheit Stück	Price Euro*
409200	IBC	18	39	2	10	6	10	148.00
409201	IBC	18	39	2	10	6	20	252.00
409202	IBC	18	46	2	10	40	10	148.00
409203	IBC	18	46	2	10	40	20	252.00
409204	IBC	18	56	2	10	63	10	148.00
409205	IBC	18	56	2	10	63	20	252.00
409206	IBC	22	44	2	15	6	10	152.00
409207	IBC	22	44	2	15	6	20	260.00
409208	IBC	22	51	2	15	40	10	152.00
409209	IBC	22	51	2	15	40	20	260.00
409210	IBC	21	61	2	15	63	10	152.00
409211	IBC	21	61	2	15	63	20	260.00
409212	IBC	27	54	2	20	6	10	206.00
409213	IBC	27	54	2	20	6	20	350.00
409214	IBC	27	61	2	20	40	10	206.00
409215	IBC	27	61	2	20	40	20	350.00
409216	IBC	25	72	2	20	63	10	206.00
409217	IBC	25	72	2	20	63	20	350.00
409218	IBC	34	64	2	25	6	10	250.00
409219	IBC	34	64	2	25	6	20	416.00
409220	IBC	34	71	2	25	40	10	250.00
409221	IBC	34	71	2	25	40	20	416.00
409222	IBC	30	82	2	25	63	10	250.00
409223	IBC	30	82	2	25	63	20	416.00
409224	IBC	43	76	2	32	6	5	196.00