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Graphite & Reinforced Graphite Gaskets

Graphite Sheet Gaskets

Graphite sheet is made from naturally occurring graphite flakes, after processing the graphite from its mined ore state to purify and expand it, the flakes are calendared into pure graphite sheets with no binders or fillers. With the lack of binders and fillers there is no significant volume loss in gaskets being used at high temperatures and the gaskets will not harden like compressed fibre gaskets containing elastomer binders. Graphite’s outstanding thermal stability, excellent compressibility and a superior chemical resistance makes one of the best gasket materials in the sealing industry today, with the only down side being graphite’s less handle ability. Due to graphite sheet being a lot more fragile then other gasket materials they must be handled and installed with care.

Technical Parameters

Description	Standard	Results
Stress Relaxation Rate	ASTM F – 38	< 5%
Compressibility	ASTM F – 36	40%
Recovery	ASTM F – 36	12 – 17%
Sealability	ASTM F – 37	0.5 ml/h
Tensile Strength	ASTM F – 152	750 psi (5.2MPa)
Maximum Temp	Non oxidizing	1600 oF (870 oC)
Maximum Temp	Oxidizing	850 oF (450 oC)
Maximum Pressure		2000 psi (140 bar)

Graphite Sheets

Gauge		Sheet Size L x W
inch	mm	inch	M
	1	39.4 x 39.4 60 x 60	1 x 1 1.5 x 1.5
1/16	1.6
	2
3/32	2.5
1/8	3.2
	4

Graphite’s Advantageous Characteristics:

• Low permeability to gases and liquids
• Flexible, soft texture
• Resistant to most mediums
• Asbestos free. No health hazard
• Environmentally compatible
• Suitable to use at temperature ranges from 250oC to 3000oC
• No binders, will not age or harden
• Has long term compressibility and recovery stability
• No cold or warm flow
• Excellent resistance to thermal shock
• Easy to cut and punch

Reinforced Graphite

To improve the performance of graphite sheet for handling during cutting and installation metal foil inserts of various types are added. Environmental Gasket Company has a number of reinforcement materials available from perforated or tanged stainless steel to flat pure nickel foil.

Perforated or Tanged Stainless Steel Graphite sheet impregnated with perforated stainless steel foil	Flat Stainless Steel Graphite sheet impregnated with flat stainless steel foil
Stainless Steel Wire Mesh Graphite sheet impregnated with stainless steel wire mesh	Flat Pure Nickel Graphite sheet impregnated with flat pure nickel foil

Reinforced Graphitee

Item	Environmental Reinforced Graphite Sheet Styles
Item	39A	39B	39C	39D	39E	39F	39G	39H
Reinforcement Style	Tanged			Flat		Mesh		Flat
Reinforcement Material	Carbon Steel	304SS	316SS	304SS	316SS	304SS	316SS	Pure Nickel

Reinforced Graphite Parameters

Item	Reinforcement Gauge	Graphite Gauge		Available Sheet Size L x W
		inch	mm	inch	M
39A	0.1 mm	1/16 - 3/32 1/8 -	1.6 2.0 2.5 3.2 4.0	39.4 x 39.4 60 x 60	1.0 x 1.0 1.5 x 1.5
39B
39C
39D	0.5 mm	- 1/16 - 3/32 1/8 -	1.0 1.6 2.0 2.5 3.2 4.0
39E
39F		- 1/16 - 1/8 -	1.0 1.6 2.0 3.2 4.0
39G
39H				39.4 x 39.4	1.0 x 1.0

Graphite and Reinforced graphite is available in both sheet format and pre cut to suit all standard Chinese and international flange standards and non standard sizes or alternatively cut to drawing for the application it is to be used for.

Ordering Information

When ordering gaskets please specify the following:
• Nominal pipe size and pressure rating or specific gasket dimensions if other than standard
• Flange Description eg. ASME, DIN
• Materials and Sizes

When ordering gasket sheet please specify the following:
• Sheet Type
• Sheet Size
• Sheet Gauge
• Reinforcement Material

Environmental Gasket Company LTD.

"Creating a Safer,Cleaner and More Reliable Manufacturing Environment"

Graphite and Reinforced Gaskets