Short answer
In solvent transfer, the seals, connection metal and, if necessary, electrical properties are assessed as much as the hose inner tube. A material appearing resistant to a solvent does not show that the whole assembly is suitable for the same fluid and condition.
Technical explanation
A hose assembly may contain more than one material in contact with the fluid. While the hose remains in good condition, the seal may be affected, or the connection metal may create a different problem. The metal and elastomer ratings in chemical tables must also be read within the product and condition scope. Depending on the volatility or flammability of the solvent, additional topics such as permeation and static electricity may become important. These properties are not inferred from a material abbreviation or the hose color alone.
Topic-specific checkpoints
| Item | Description |
|---|---|
| Inner tube | Product/layer suitable for the solvent and conditions. |
| Seal | Exact compound or part code; not just the elastomer family. |
| Metal | Wetted body and connection material. |
| Additional risk | Permeation, electrical requirements and external exposure. |
How is it assessed in practice?
Mark the parts list in terms of contact with the fluid: the inner tube, seal, coupling body and other wetted surfaces are separate rows. For example, fitting a different seal to a chemical hose is a new compatibility assessment. Instead of saying 'solvent' to the manufacturer, communicate the full product name, composition and temperature. If another solvent is used during cleaning, open a second service row. Store each suitability response so that it is clear which part code it belongs to.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
If the hose is PTFE, does seal selection become unimportant?
No. The seals and connections must meet the conditions separately. The broad chemical resistance of the inner tube does not by itself ensure the suitability of the whole assembly.
Source coverage
-
S020
Chemical Resistance Chart Gates · accessed 2026-10-19 PDF page 2 / printed page 1: Chemical Resistance Table, notes
-
S040
Smoothbore PTFE hose Aflex / Watson-Marlow · accessed 2026-10-19 Construction; antistatic liner; use limitations