Products



Fuel / Oil Applications

Silflex has two build options available for silicone hoses that are likely to either come into contact with oil or diesel and hoses needed for the constant transportation of more aggressive fuels. Profuel® is a fluoroelastomer lined silicone hose designed for the latter and is perfect for use with petrol, bio-fuels and the more aggressive bio-diesels. Standard fluorosilicone lined hoses work with diesel fuel and oil mist applications, both provide a barrier to stop the silicone degrading and are a cost effective alternative to complete Fluorosilicone and Fluorocarbon hoses. Please contact us with any queries due to the safety implications involved with transporting flammable liquids.

 

 

Silflex Profuel®

 

The Silflex Profuel® hose is specially developed fluoroelastomer lined silicone hose for use where greater fuel/oil resistance is required than can be achieved with conventional fluorosilicone. One of the principal driving forces behind the development of the fluoroelastomers was improved fuel resistance compared to any of the previously available elastomers, and it is still the best conventional elastomeric material available for fuel applications.

 

The high fluorine content elastomer used in the Silflex Profuel® material is recommended as having the best resistance to automotive grade fuels, of any of the fluoroelastomers, together with good compression set for excellent sealing characteristics, a critical feature in fuel hose applications to minimise evaporation losses at joints. This plus its excellent high temperature resistance, means that in conjunction with silicones excellent high temperature properties the Profuel® hose is ideal for high temperature under bonnet applications.

 

The Profuel® lining has very low permeability and is inherently self extinguishing in the case of fire.

 

Product Life

 

The grade of fluoroelastomer used for the Profuel® liner was chosen based on its having very low permeation figures of critical significance in prolonging the life of the Profuel® product. However only the special green liner of a Profuel® product hose is fuel/oil resistant and consequently the hose in not suitable for use in applications where the hose will be immersed in fuel.

 

In some applications a further Fluorosilicone liner is added to the outside of the hose. A blended Fluorosilicone is also available for applications such as filler hoses, oil/air mist intercooler hoses etc.

Fluorosilicone Lined

 

Generally used in applications where the medium flowing through the hose is likely to degrade the standard silicone. Designed to work with less aggressive fuels such as oil and diesel, the fluorosilicone lined hose is perfect for protecting the otherwise permeable silicone from oil/diesel. This comes in the form of a lining of Black Fluorosilicone, covered with Plies of silicone, reinforced with a choice of reinforcing fabric dependant on the working pressure and temperature.

 

Engineering Options

 

Wire Reinforcement

A wire helix between the plies helps to prevent collapse in negative pressure conditions.

 

Anti Abrasion Sleeves 

Anti Abrasion Sleeves to protect against localised abrasion.

 

Part Marking

Part marking with Silflex or customer logos and part numbers assists with product identification and traceability.

 

Location Marking

Marks can be added to the hose to specify where components are to be placed such as clips helping speed up installation.

 

Production Volumes

 

As a result of our unique manufacturing process we are extremely flexible with production volumes. Silflex has a very diverse range of customers and we understand that each requires individual silicone hose solutions. Many specialist customers require low run and prototype orders however others need high volume mass produced parts. We are a self contained unit capable of offering what other companies cannot, a personally tailored service designed to meet our customers needs.

Bespoke Silicone Hose Design

 

Specifications

-50ºC to +180ºC (Standard)

 

Options

Standard (Polyester Reinforced)

Fluorosilicone Lined (Oil & Diesel Resistant)

ProFuel™ Lined (Permanent Fuel Use)

 

Materials — Silicone Rubber Compound

Colour — Various

Hardness — 5 ± 5

Specific Gravity (g/cm³) — 1.18 ± 0.05

Tensile Strength (Mpa) — 8.6

Elongation at break (%) — 308

Tear Strength — 13

 

The above physical properties refer to a test sheet press cured for 5mins at 115°C, and post cured for 4 hrs @ 200°C. Tested to the relevant BS903 standard. Fluid resistance figures can be supplied on request.

 

Materials — Fluorosilicone Rubber Compound

Colour — Black

Hardness — 65 ± 5

Specific Gravity (g/cm³) — 1.59 ± 0.05

Tensile Strength (Mpa) — 5

Elongation at break (%) — 210

Tear Strength (KN/m) — 23

 

The above physical properties refer to a test sheet press cured for 5mins at 115°C, and post cured for 4 hrs @ 200°C. Tested to the relevant BS903 standard. Fluid resistance figures can be supplied on request.

 

Materials — Profuel® Rubber Compound

Colour — Green

Hardness — 62 ± 3

Specific Gravity (g/cm³) — 2.05 ± 0.02

Tensile Strength (Mpa) — 14.5

Elongation at break (%) — 250

 

The above physical properties refer to a test sheet press cured for 5mins at 115°C, and post cured for 4 hrs @ 200°C. Tested to the relevant BS903 standard.

 

Fluid Resistance Figures (Profuel® Lining)

 

Immersion Medium

Temp

Resistance

ASTM No1 Oil

150ºC

Excellent

ASTM No3 Oil

150ºC

Excellent

ASTM Fuel B

40ºC

Excellent

 

The values above have been arrived at through the use of immersion tests. Service conditions, however, are usually less severe than immersion tests, as the the rubber may only be splashed or partly exposed to the particular medium.

Download datasheet