High-Performance Graphite Flat Seals

Application area Almost universally usable (depending on pressure and temperature); cover the... more

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Application area

Almost universally usable (depending on pressure and temperature); cover the full range of classic flat seals

Not usable in ozone- and fluorine-containing media

Product specification

Graduated gasket material of expanded graphite (purity min. 98 %)

Acid-proof expanded metal inlay made of chrome-nickel steel

Adhesive-free

Binderless

Filler-free

Resistant to almost all organic and anorganic acids, alkalis, oils and solvents

Technical specification

Color: graphite gray

Binding material: no

Metal insert: chrome-nickel steel (material no. 1.4404)

Density: 1.40 g/cm³ (DIN 28090-2)

Tensile strength: 25 N/mm² (MD); 10 N/mm² (CD) (DIN 52910)

Pressure resistance: 45 N/mm² (+175 °C); 43 N/mm² (+300 °C) (DIN 52913)

Compressibility: 30 % (ASTM F 36 J)

Recovery: 20 % (ASTM F 36 J)

Cold compressibility KSW: 25 - 35 % (DIN 28090-2)

Cold recovery KRW: 3.5 - 5 % (DIN 28090-2)

Hot creep WSW/300: <5 % (DIN 28090-2)

Hot recovery WRW/300: >3 % (DIN 28090-2)

Recovery R: 0.065 mm (DIN 28090-2)

Leakage TA-Luft: (VDI 2200 draft)

Component testing: 30 Mpa, +300 °C, 1 bar helium 0.0001 mbar*l/m*s

Chlorine content: total: 300 ppm (Siemens AV 9-014), water-soluble: 50 ppm (Siemens AV 9-014)

Fluoride content: 300 ppm (Siemens AV 9-014)

Temperature range: -240 to +550 °C (depending on pressure)

Max. operating pressure: 200 bar (depending on temperature)

Regulations: German TA-Luft certification, Firesafe (API607 / BS6755), BAM (O2: +200 °C / 130 bar), DVGW

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*
409424	IBC	18	39	2	10	6	10	103.00
409425	IBC	18	39	2	10	6	20	172.00
409426	IBC	18	46	2	10	40	10	103.00
409427	IBC	18	46	2	10	40	20	172.00
409428	IBC	18	56	2	10	63	10	103.00
409429	IBC	18	56	2	10	63	20	172.00
409430	IBC	22	44	2	15	6	10	111.00
409431	IBC	22	44	2	15	6	20	185.00
409432	IBC	22	51	2	15	40	10	111.00
409433	IBC	22	51	2	15	40	20	185.00
409434	IBC	21	61	2	15	63	10	111.00
409435	IBC	21	61	2	15	63	20	185.00
409436	IBC	27	54	2	20	6	10	133.00
409437	IBC	27	54	2	20	6	20	221.00
409438	IBC	27	61	2	20	40	10	133.00
409439	IBC	27	61	2	20	40	20	221.00
409440	IBC	25	72	2	20	63	10	133.00
409441	IBC	25	72	2	20	63	20	221.00
409442	IBC	34	64	2	25	6	5	98.00
409443	IBC	34	64	2	25	6	10	171.00
409444	IBC	34	71	2	25	40	5	98.00
409445	IBC	34	71	2	25	40	10	171.00
409446	IBC	30	82	2	25	63	5	98.00
409447	IBC	30	82	2	25	63	10	171.00
409448	IBC	43	76	2	32	6	5	118.00

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[1] IBC = smooth flange; TG = grooved flange