Foil & Tanged Reinforced Graphite
Advantages
- No ageing or embrittlement of the graphite layers.
- Good scratch resistance and excellent ‘anti-stick’ agent on all flanges.
- No measurable cold or warm flow up to maximum permissible gasket stress.
- Good resistance to chemicals and has a good shear strength coupled with good resistance to thermal shock.
- Max Temp: 550°C
- Max Pressure : 200 bar
- Particularly suitable for worn or pitted flanges
- Use with strong oxidising agents should be avoided
Note : For applications sealing inert or reducing media, at temperatures in excess of 370°C, attention must be given to the possibility of oxidative attack on the gasket from the external environment.
Foil Reinforced Graphite 98% (min) Pure Graphite is laminated with a thin stainless steel foil (0.05mm thick) to produce an excellent gasket sheet that has long term stability on compression and recovery over a wide temperature range.
Tanged Reinforced Graphite 98% (min) Pure Graphite is laminated with a tanged (perforated) stainless steel core(0.10mm thick) to produce an excellent gasket sheet that has low diffusion rates, high blow-out resistance and high mechanical strength. It is recommended for applications involving high sealing stresses and where high blowout resistance is required.
Pure Graphite Sheet & Rolls
Pure expanded mineral graphite flake or chip particles are subjected to laminar swelling and are subsequently calendered into flexible foil without the use of any separate binder, a feature which guarantees a high degree of purity not associated with other graphite derivatives. The foil is processed in a number of ways to adapt the unique properties of the material to a variety of sealing needs The raw material is a mineral that is mined in a similar way to coal.
The sealability of graphite is akin to that associated with elastomeric materials but its temperature capability far exceeds that of even the most exotic rubber compound. Add to this an outstanding resistance to a wide range of organic and inorganic chemicals and it is easy to see why many regard graphite as one of the most important additions to the gasket manufacturer’s stock holding since the advent of polytetrafluoroethylene (PTFE).
Pure graphite is available in sheets or rolls and in a wide range of thicknesses
Die Moulded Graphite Rings
Pure Graphite Die Moulded rings are moulded with the Pure Expanded Mineral Flexible Graphite Tapes which are evenly wrapped and compressed under extreme pressure to form many profile rings and sizes of various densities using high precision steel moulds.
We provide a wide variety of mould dimensions to satisfy the needs of every applications.
Available in a range of densities from 1.25 g /cc to 1.8 g /cc with graphite content ranging from 99% to 99.85% Corrosion inhibitors and oxidation resistant grades and PTFE impregnated grades also supplied.
Application:
Withstands violent alteration of temperature and pressure. It is ideal packing for valve and static seal in almost all applications. Can be used as stand-alone packing or in combination with other packing rings.
Rings can be fitted with a variety of metal caps to customer specification
Crinkle Graphite Tapes
Graphite crinkle tapes are made from pure graphite with the addition of a corrosion inhibitor.
Pure graphite tapes are patterned into a ribbon form with no impregnants, binders, additives, oils or greases which could possibly leave the packing and reduce its volume or contaminate the process media.
Tapes can be supplied plain or with the addition of a self adhesive backing on one side to aid fitting.
Available Sizes
Thickness: 0.38mm 0.5mm
Length per spool : 15 to 30 metres or to customer requirement
Widths: 6.4mm 9.5m12.7mm
15mm19.1mm 25.4mm
32.0mm 38.0mm
Other widths available on request
Material Data:
Purity : 98% Density : 1.0 to 1.1 g/cc
pH : 0-14 (except strong oxidisers)
Op. Pressure : 450 bar to 700 bar max.
Temperature
-240°C to +3000°C (Non-Oxid)
-240°C to + 500°C (Oxidising)
-240°C to + 650°C (Steam)
Construction : Expanded Mineral Graphite Tape with or without Pressure sensitive adhesive backing, Corrugated or smooth finish
Installing Graphite Crinkle Gasket Tape
1. Brush off any rust or foreign particles. Wipe flange surface thoroughly with a rag soaked in acetone or other suitable solvent to remove grease or oil
2. Insert fingernail between paper backing strip and the tape and strip the paper back three to six inches. Draw a reference line in flange and press squared off end of tape against it
3. Now, start laying the tape along the face of the flange, peeling the paper backing as you go. To prevent the adhesive surfaces of the tape from doubling back on themselves and sticking together, strip away only a few inches of paper at a time
4. When the starting point has been reached, lap the tape not more than 1/16 inch and cut with a sharp blade
