Diesel Resistant RTV Silicone Sealant

Silicone RTV sealants are prone to attack from mineral oils.  To overcome this problem silicone RTV's can be formulated using fluorosilicone polymers, however the dramatic increase in costs usually prohibits their commercial use.

ACC have taken one of their patented acetone cure RTV silicone sealants AS1810 and carried out extensive testing to prove their suitability for applications involving contact with both conventional and (RME) bio-diesel fuels.

Mouse Click 2AS1810 Technical Data & Samples


Testing

As a supplier to the aerospace industry for well over 25 years ACC silicones are well qualified to carry out an extensive rage of material testing within their own facilities. In addition to the standard tests carried out under their own stringent quality control and development procedures,  ACC commissioned a specialist outside testing house.

ACC employed MERL (Materials Engineering Research Laboratories) to carry out tests using Liquid F diesel (ISO1817) and RME diesel (DIN EN 14214) at ambient and elevated temperatures relating to common demands of automotive applications. Mechanical stress testing, heat capacity and modulus changes over the working temperature range were all measured to provide comprehensive data on the suitability of AS1810 as a gasket sealer in fuel contact applications.

As a brief summary, the AS1810 showed suitable resistance to both Liquid F Diesel and RME Diesel to remain useful as a gasket, even after 1000 hours at 100°C to simulate long term contact with the test fuels. There was expected loss in physical strength but no chemical breakdown was observed.

DMA analysis at temperature extremes showed minimal changes in the elastic properties of AS1810 from -45°C to 60°C proving the suitability of the material for terrestrial conditions without the influence of heat from the exhaust and engine areas of the vehicle.

Specific heat capacity testing i.e. the amount of energy required to ra ise the temperature of the test material revealed that AS1810 requires substantial energy to raise the temperature by 1°C in comparison to metallic materials. This demonstrates that AS1810 is a good insulator of heat and would also require a longer time period to dissipate the heat and return to ambient conditions. It has been commonly known that silicones need to be filled with conductive materials to change the heat capacity and thermal management properties, ACC also have a range of specific products that are designed to meet these needs.

Summary

Extensive testing proved AS1810 suitable for use with conventional and Bio-diesel when used as a gasket material in conjunction with mechanical fixings.

For the full report please download the PDF version of this page

Sean Stoodley

European Technical Manager

 

ACC Silicones Ltd, Amber House, Showground Rd, Bridgwater, TA6 6AJ
Tel: +44 (0) 1278 411400 Fax: +44 (0) 1278 411444