anim_logo.gif (2572 bytes) Thermodynamics Style 7000
Pure Expanded Flexible Mineral Graphite Plain Homogeneous Gasketing Sheets with Inhibitor
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Table no. 1 is really the key to the performance gains available from Thermodynamics Style 7000 to be used as a flange gasket. If the material is contained in such a way that the volume of the seal does not diminish through mechanical problems such as extrusion, and no thermal/chemical degradation or abrasive wear takes place, the reduction in original sealing force is minimal, even after prolonged period of service. Although expanded graphite is more expensive than many conventional sealing materials its selection will frequently be justified cost-effective even on a gasket by gasket basis due to the reduction in frequency of down time.
Table No. 1
Compressibiltiy / Recovery Style 7000
ASTM F36-66 Procedure H 1mm thk 2mm thk
(Major load 7N/mm2) (1000lbf/in2) 1.0g/cc
Compressibility 39% 33%
Recovery 20% 25%
Stress relaxation DIN 52913 48N/mm2
Creep relaxation ASTM F-38 at 100°C <5%
Sealability fuel A ASTM F-37B <0.2 to 0.5ml/h
Max. gasket stress - -
The quest for non-asbestos materials has shown that there are few, if any, alternatives to Thermodynamics Style 7000 which span the overall capabilities of, for example, compressed asbestos fibre. Where bolt loading is limited or the gasket shape is other than circular the choice will rest between plain Style 7000 or the laminated version described in Thermodynamics Style 8000.
BASIC FACTS ABOUT THERMODYNAMICS STYLE 7000
 
- Good scratch resistance, "antistick" treatment. No adhesion problems.
 
- No binders or filler, therefore no flow or creep under influence of temperature, pressure, chemicals or time exposure. No aging or embrittlement.
 
- Permanently resilient (10% of compressed gasket thickness).
 
- Low friction properties-self-lubricating, high thermal conductivity.
 
- Only a small quantities of adhesive thickness are used, the outstanding chemical resistance remains unaffected. Resistance to a wide range of chemicals.
 
- No loss of volatiles even at high temperature thus minimizing frequency of gland adjustment.
 
- Excellent resistance to compression set resulting in little loss of radial force or flange seating stress over long periods.
 
- Unprecedented micro-and macro sealing ability present new ways of sealing gasket surfaces that are out of flat, gouged or pitted!
 
- High temperature capability particularly in non-oxidizing environments. They are Fire-proof!
 
- Exceptionally low chloride content. Low permeability to gases and liquids.
 
- Presents a non-wetting characteristics to glass, ceramics and most molten metals.
 
- Sheets and laminates can be cut easily with conventional cutting or punching tools, with reduced tool wear as compared to asbestos or synthetic laminates. They have no limited storage life.
 
- Laminates are stiff and allow good handlability even for intricate shape stamped gaskets, however, surface protection is advisable until final installation.
 
- Standard and passivated expanded flexible mineral graphite conform to national water council requirements for service with potable water. Approval no. 7907 MX.
 
- May be supplied to the requirements of statutory instruments 1978 no. 1927 "The materials and articles in contact with food regulations 1978". Also conform to USDA and FDA requirements for incidental contact with food regulations (FDA 21 CFR177.1550).

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