Life assessment of rubber articles in fuels
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The choice of rubber material for use in sealings and hoses in the fuel system is of great importance. If a wrong type of rubber is used, premature failure during service may occur. This impacts the environmental performance, the safety during driving, uptime and economy of the transport. In this diploma work, rubbers for use in sealing and hoses in the fuel system have been evaluated to assess which materials have the potential to be used under long-term use in contact with commercial fuels.
Three commercial fuel hoses, nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), ethylene-acrylic rubber (AEM) and fluorocarbon rubber (FKM) of varying types and compositions have been evaluated in diesel with 7% RME (rapeseed methyl ester), 100% biodiesel of RME and ethanol fuel. Tests were performed by immersing the materials in fuel and measure the compression set and changes in properties like volume, hardness, tensile strength and elongation at break.
The results showed that one NBR material, one AEM and all FKM are potential materials for long term use in diesel with 7% RME. All types of NBR and two types of FKM (terpolymers, peroxide cured) may be used in ethanol fuel. NBR and HNBR were the only rubbers evaluated in biodiesel. NBR and HNBR with an ACN content of ~30% might be used in 100% RME at lower temperatures for shorter periods. The aging resistance in air was good for HNBR, AEM and FKM but poor for NBR. Life assessment of rubber articles in fuels
Place, publisher, year, edition, pages
2013. , 100 p.
UPTEC K, ISSN 1650-8297 ; 13012
IdentifiersURN: urn:nbn:se:uu:diva-205688OAI: oai:DiVA.org:uu-205688DiVA: diva2:642457
Scania CV AB
Master Programme in Chemical Engineering
Hilborn, JönsLarsson, Karin