Butyl 7BU2359

Product catalog summary

Overview
Hutchinson, a leading manufacturer of sealing solutions, offers standard and custom O-Rings, X-Rings, Bonded Seals, and special-shaped seals. The document discusses the use of SF6 gas in gas-insulated switchgears (GIS) and the shift towards more environmentally friendly replacement gases.

Specifications
The document lists various compounds used in GIS, detailing their rubber family, hardness, tear strength, compression set, and temperature conditions. The compounds include:

7BU2359 (IIR): Hardness 67 Sh A, Tear strength 12 MPa, Compression set 10%, TR10 -50°C, Glass Transition Temperature -60°C.
7EP1881 (EPDM): Hardness 68 Sh A, Tear strength 14 MPa, Compression set 12%, TR10 -48°C, Glass Transition Temperature -57°C.
EP2107 (EPDM): Hardness 70 Sh A, Tear strength 12 MPa, Compression set 10%, TR10 -57°C, Glass Transition Temperature -66°C.
7N2373 (CR): Hardness 72 Sh A, Tear strength 21.3 MPa, Compression set 19%, TR10 -42°C, Glass Transition Temperature -50°C.
PB701 (NBR): Hardness 68 Sh A, Tear strength 17 MPa, Compression set 12%, TR10 -20°C, Glass Transition Temperature -30°C.

Procedures and Standards
The compounds are tested under specific conditions, such as temperature and duration, to ensure their suitability for GIS applications. The document highlights the ecological need to replace SF6 with gases based on CO2 or N2 due to SF6's high global warming potential.

Recommendations
Hutchinson recommends the use of the IIR compound 7BU2359 for both SF6 and replacement gases. It offers a wide temperature range (-60°C to 125°C, peak 175°C), low CO2 permeability, excellent long-term sealing capability, and is inert against fluor additives. Color coatings are available for production differentiation.

Catalog excerpts

Compounds for SF6 & replacement gases GAS INSULATED SWITCHGEARS In-house Manufacturing, Safe Sealing

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As a leading manufacturer of sealing solutions, Hutchinson provides standard and tailor-made O-Rings, X-Rings, Bonded Seals and special-shaped seals. The SF6 gas, widely used in gas-insulated switchgears (GIS) to extinguish the electrical arc, has a global warming potential 17.000 times higher than the one of CO2. The ecological urge brings the market to progressively replace the SF6 by gases based on CO2 or N2 with much smaller molecules. Common sealing materials such as CR, EPDM and NBR cannot be used anymore due to poor permeability values. In addition to a wide range of existing compounds...

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