ALTERNATIVE PTFE HOSE COVER DESIGN OPTIONS

Purpose

For many applications, it is required that Smoothbore PTFE hose of all sizes, grades and braids should have an outer cover of a flexible plastic, or rubber.

This is usually required to protect the braid, or to colour the hose, or to allow printing on to the hose.

Plastic Covers - available to special order

PVC - flexible PVC covers are the most popular, either transparent, or a wide range of solid or semi-transparent colours.

A particular application is for -3 size single braid, pvc covered hose, used as a brake hose for motorbikes, motorsport and special vehicles.

PVC covers are designated as 'PVC' followed by the colour if a solid colour is required, or 'trans' then the colour if a semi-transparent colour is required.

For example - '-3 HW, SB, PVC Blue' would call for a -3 heavy wall, single braid hose with a solid blue PVC cover.

Nylon II (Nyl), Hytrel (Hyt), Sarlink (Sar) and other types of flexible thermoplastics are also widely used.

Text can be continuously printed along the hose length, usually in black.

Rubber Covers - available to Special Order

Aflex Hose also have rubber extrusion facilities, and can continuously extrude rubber covers on to all grades of hose.

EPDM rubber in blue or black(antistatic), or platinum cured Silicone rubber in transparent or white are available to special order. Other colours and types of rubber may also be available. Consult Aflex Hose for details.

'PRICKING' of Hose Covers

As a standard, PVC and Nylon II covers are NOT pricked. Hytrel, Sarlink and Rubber Covers ARE pricked.

If any variation to these standard rules are required, they must be specified.

Colour References

If a particular grade of one colour is required, a RAL Number or a colour reference sample is required.

Note: Coloured covers are to special order, and require a Set-Up Charge, so small quantities are usually not economic.

Limitations in Use - The application of a plastic or rubber cover limits the usage conditions of the hose, particularly the operating temperatures, as given below.

Flexible PVC from -10°C (+14°F) to +60°C (+140°F)
Nylon II from -40°C (-40°F) to +80°C (+180°F)
EPDM Rubber from -40°C (-40°F) to +140°C (+280°F)
Silicone Rubber from -55°C (-67°F) to +200°C (+390°F)