SIGRAFLEX® graphite sheets for gaskets made from flexible graphite

SIGRAFLEX unreinforced and reinforced graphite sheets

The portfolio of SIGRAFLEX graphite sheets made from flexible graphite provides a variety of solutions to all needs. We offer gasket sheets for flat gaskets in different variants e.g. unreinforced or reinforced, with or without impregnation, with adhesives or binders as well as adhesive-free. SIGRAFLEX graphite gasket sheets are manufactured exclusively at our two sites in Germany and the US.

Improved safety

Our reinforced SIGRAFLEX graphite gasket sheets made from flexible graphite are highly corrosion resistant. This considerably reduces the maintenance costs of equipment and extends its service life. Above all, the use of premium SIGRAFLEX materials significantly enhances gasket safety for employees and the environment – a high priority when operating equipment.

Higher long-term sealing standards
Very good residual stress value
Excellent conformability to flange irregularities
Outstanding chemical and thermal resistance
Lower maintenance expenses thanks to the sealing materials’ long service life

Especially for equipment which has to meet the requirements of the “Technical Instructions on Air Quality Control” (TA Luft), our wide variety of reinforced and impregnated SIGRAFLEX graphite sheets provide the optimum sealing material – just like for stricter limit values for fugitive emissions.

Our materials have been developed with an in-depth understanding of their use and application. Allow us to advise you – even on site. Together we will develop a sustainable solution tailored to your needs. Please just ask us.

We offer the graphite sheet for your individual application - no matter if you are e.g. looking for a gasket sheet material which is leak tight even under high pressure or which provides support to fulfill the requirements of TA Luft.
Use our product finder to quickly and easily identify the optimum gasket material for your needs.

	Scope of application	STANDARD	ECONOMY	UNIVERSAL	UNIVERSAL PRO	CLEAN	SELECT	HOCHDRUCK	HOCHDRUCK PRO	APX2 HOCHDRUCK	MF	EMAIL	SIGRASEAL	BSSC	BTCSS
Gaskets	Kammprofile and corrugated gaskets	○
	PTFE envelope gaskets											●
	Gaskets for pumps and valve bodies	○	●	○	○	○		●	●	●			○	●	○
	One-piece gaskets up to Ø 1500 mm (59.1")			●	●			●	●	●		●	●	●	●
Flange design	Flanges with sealing strips	○	●	●	●	●	●	●	●	●	●		●	●	●
	Tongue-and-groove flanges/ highly stressed sealed joints							●	○	●
	Unstable flanges with low gasket stress		●			●					●
	Vessel and equipment flanges	○		●	●	●		●	●	●	●		○	●	●
	Emergency repairs, complex dimensions	●	○					●	●	●				●
Operations under pressure	Low internal pressure up to 40 bar	●	●											●
	Internal pressures vacuum up to 100 bar			●	●	●	●				●		○		○
	Internal pressures vacuum up to 250 bar							●	●	●
Operating temperatures	− 200 °C to 300 °C (-328 °F to 572 °F)	●	●	●	●	●	●	●	●	●	●		●	●	●
Operating temperatures	− 200 °C to ~ 550 °C (-328 °F to ~ 1022 °F)¹⁾	●	●	●	●		●	●	●	●	●		○	●	●
Impermeability	Max. requirements acc. to TA Luft²⁾				●	●	●	○	●		●	●

Typical properties	Unit	HOCHDRUCK PRO 2–9 inserts	APX2 HOCHDRUCK 1–5 inserts	MF 3–7 inserts	UNIVERSAL PRO 1–2 inserts	SELECT¹⁾ 2 inserts
Metal reinforcement: Stainless steel sheet 316 (L)	mm in	0.05 0.002	0.05 0.002	0.05 0.002		0.05 0.002
Metal reinforcement: Perforated stainless steel sheet 316 (L)	mm in			0.1 0.004	0.1 0.004
Thickness	mm in	1.0-4.0 0.04-0.16	1.0-3.0 0.04-0.12	2.0/3.0 0.08/0.12	1.6/2.0/3.0 0.06/0.08/0.12	1.6 0.06
Width	mm in	1000/1500 39.4/59.1	1500 59.1	1000 39.4	1000/1500 39.4/59.1
Length	mm in	1000/1500 39.4/59.1	1500 59.1	1000 39.4	1000/1500 39.4/59.1
Purity	%	≥ 99.85	≥ 98	≥ 99.85	≥ 98	≥ 98
Ash content	%	≤ 0.15	≤ 2.0	≤ 0.15	≤ 2.0	≤ 2.0
Chloride content	ppm	≤ 10	≤ 25	≤ 10	≤ 25	≤ 25

Typical properties	Unit	ECONOMY¹⁾ 1–2 inserts	BSSC 1 insert	BTCSS 1 insert	BMY
Metal reinforcement: Stainless steel sheet 316 (L)	mm in	0.05 0.002	0.05 0.002
Metal reinforcement: Perforated stainless steel sheet 316 (L)	mm in			0.1 0.004
Polyester film	mm in				0.127 0.005
Bonded/adhesive-free		bonded	bonded	adhesive-free	bonded
Thickness	mm in	0.55-3.0 0.022-0.118	0.76-3.05 0.03-0.12	0.76/3.05 0.03-0.12	0.38-3.05 0.015-0.12
Width	mm in	1000 39.4	1016/1524 40/60	1016/1524 40/60	1016/1524 40/60
Length	mm in	1000 39.4	1016/1524 40/60	1016/1524 40/60	1016/1524 40/60
Purity	%	≥ 98	≥ 98	≥ 98	≥ 98
Ash content	%	≤ 2.0	≤ 2.0	≤ 2.0	≤ 2.0
Chloride content	ppm	≤ 25	≤ 50	≤ 50	≤ 50