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
409225	IBC	43	76	2	32	6	10	342.00
409226	IBC	43	82	2	32	40	5	196.00
409227	IBC	43	82	2	32	40	10	342.00
409228	IBC	41	88	2	32	63	5	196.00
409229	IBC	41	88	2	32	63	10	342.00
409230	IBC	49	86	2	40	6	5	240.00
409231	IBC	49	86	2	40	6	10	416.00
409232	IBC	49	92	2	40	40	5	240.00
409233	IBC	49	92	2	40	40	10	416.00
409234	IBC	47	103	2	40	63	5	240.00
409235	IBC	47	103	2	40	63	10	416.00
409236	IBC	61	96	2	50	6	5	314.00
409237	IBC	61	96	2	50	6	10	542.00
409238	IBC	61	107	2	50	40	5	314.00
409239	IBC	61	107	2	50	40	10	542.00
409240	IBC	59	113	2	50	63	5	314.00
409241	IBC	59	113	2	50	63	10	542.00
409242	IBC	77	116	2	65	6	5	428.00
409243	IBC	77	116	2	65	6	10	744.00
409244	IBC	77	127	2	65	40	5	428.00
409245	IBC	77	127	2	65	40	10	744.00
409246	IBC	73	138	2	65	63	5	428.00
409247	IBC	73	138	2	65	63	10	744.00
409248	IBC	89	132	2	80	6	5	494.00
409249	IBC	89	132	2	80	6	10	844.00
409250	IBC	89	142	2	80	40	5	494.00
409251	IBC	89	142	2	80	40	10	844.00
409252	IBC	86	148	2	80	63	5	494.00
409253	IBC	86	148	2	80	63	10	844.00
409254	IBC	115	152	2	100	6	5	572.00
409255	IBC	115	152	2	100	6	10	982.00
409256	IBC	115	162	2	100	16	5	572.00
409257	IBC	115	162	2	100	16	10	982.00
409258	IBC	115	168	2	100	40	5	572.00
409259	IBC	115	168	2	100	40	10	982.00
409260	IBC	110	174	2	100	63	5	572.00
409261	IBC	110	174	2	100	63	10	982.00
409262	IBC	141	182	2	125	6	5	728.00
409263	IBC	141	182	2	125	6	10	1,232.00
409264	IBC	141	192	2	125	16	5	728.00
409265	IBC	141	192	2	125	16	10	1,232.00
409266	IBC	141	194	2	125	40	5	728.00
409267	IBC	141	194	2	125	40	10	1,232.00
409268	IBC	135	210	2	125	63	5	728.00
409269	IBC	135	210	2	125	63	10	1,232.00
409270	IBC	169	207	2	150	6	5	842.00
409271	IBC	169	207	2	150	6	10	1,402.00
409272	IBC	169	218	2	150	16	5	842.00
409273	IBC	169	218	2	150	16	10	1,402.00
409274	IBC	169	224	2	150	40	5	842.00
409275	IBC	169	224	2	150	40	10	1,402.00
409276	IBC	163	247	2	150	63	5	842.00
409277	IBC	163	247	2	150	63	10	1,402.00
409278	IBC	220	262	2	200	6	5	1,172.00
409279	IBC	220	262	2	200	6	10	1,916.00
409280	IBC	220	273	2	200	16	5	1,172.00
409281	IBC	220	273	2	200	16	10	1,916.00
409282	IBC	220	284	2	200	25	5	1,172.00
409283	IBC	220	284	2	200	25	10	1,916.00
409284	IBC	220	290	2	200	40	5	1,172.00
409285	IBC	220	290	2	200	40	10	1,916.00
409286	IBC	210	309	2	200	63	5	1,172.00
409287	IBC	210	309	2	200	63	10	1,916.00
409288	TG	29	39	2	15		10	152.00
409289	TG	29	39	2	15		20	260.00
409290	TG	36	50	2	20		10	206.00
409291	TG	36	50	2	20		20	350.00
409292	TG	43	57	2	25		10	250.00
409293	TG	43	57	2	25		20	416.00
409294	TG	51	65	2	32		5	196.00
409295	TG	51	65	2	32		10	342.00
409296	TG	61	75	2	40		5	240.00
409297	TG	61	75	2	40		10	416.00
409298	TG	73	87	2	50		5	314.00
409299	TG	73	87	2	50		10	542.00
409300	TG	95	109	2	65		5	428.00
409301	TG	95	109	2	65		10	744.00
409302	TG	106	120	2	80		5	494.00
409303	TG	106	120	2	80		10	844.00
409304	TG	129	149	2	100		5	572.00
409305	TG	129	149	2	100		10	982.00
409306	TG	155	175	2	125		5	728.00
409307	TG	155	175	2	125		10	1,232.00
409308	TG	183	203	2	150		5	842.00
409309	TG	183	203	2	150		10	1,402.00
409310	TG	239	259	2	200		5	1,172.00
409311	TG	239	259	2	200		10	1,916.00