Power Assemblies and Controllers

Circuit Protection

Thermal Compound

GD Rectifiers offers two types of thermal compound: SCX-13 and Penetrox A-13. The Penetrox A-13 will shortly replace the SCX-13 thermal compound which has now been made obsolete.

Penetrox A-13 is a jointing compound by Burndy that offers a synthetic base compound containing evenly suspended zinc particles. Penetrox A-13 is recommended for aluminium to aluminium, aluminium to copper connections and aluminium conduit threads. It is compatiable with rubber or polythylene and other insultating conductors and is UL listed for all voltages.


• Burndy Penetrox is an oxide inhibiting compound with evenly suspended zinc or copper particles

• The grease is fully compliant with the latest international standards and specifications

• Most of the range is UL listed for all voltage ranges

• Easy to apply and available in various container sizes, including tubes and tubs

Penetrox A-13 by GD Rectifiers

View Penetrox A-13 Datasheet

SCX-13 contains prime grade zinc and is formulated with 50% metallic zinc to create a compound that enhances electrical and thermal conductivity when used on high power jointing, heatsink, crimp connections and stud bolt mountings.

When the connection is tightened, the grease is displaced, leaving a layer of zinc filling in the surface imperfections of the interface. This has a twofold effect: it improves the electrical conductivity and it improves thermal conductivity. This reduces the connection temperature under high power conditions by a reduced voltage drop and by providing a heat conductivity path to the connection’s substrate.

SCX-13 is manufactured by Jet-Lube with a unique grease compounded from custom refined low sulphur oil. The grease base ensures brushability over a wide temperature range, tenacious adherence to all surfaces, resistance to water wash out and the prevention of rust/corrosion. This makes the product easier and more reliable to use.


• Makes connections more reliable

• Makes connections more weatherproof

• Protects connections from corrosion

• Reduces temperature rise

• Low sulphur content

• Non-reactive, no gassing in storage

• Brushable over a wide temperature range

• Sticks to wet joints 

View the SCX-13 Datasheet


For further information please call GD Rectifiers on 01444 243 452 or email: .(JavaScript must be enabled to view this email address)

GD Rectifiers Ltd

GD Rectifiers design and manufacture Selenium and Silicon Rectifiers, Suppressors, Converters, Inverters and Regulator Products for industrial power control applications.

They are the UK's leading Distributor of power electronic components and hold extensive stock of Diodes, Thyristors, IGBTs and MOSFETs from the world's leading semiconductor manufacturers.

Further information:

You can find further information on GD Rectifiers Ltd using the following links:

Tel: 01444 243 452

Fax: 01444 870 722

Email: enquiries@gdrectifiers.co.uk