Every other machine in this section fails its hoses through movement, abrasion or weather. A moulding machine does none of those. It stands in a clean, air-conditioned hall and ages its hoses anyway, because a few centimetres away there is a barrel running at plastic-processing temperature all day.
Heat from outside.
A hose temperature rating describes the fluid inside it. On a moulding machine the fluid may be well controlled while the hose itself sits in radiated heat from the barrel, the heater bands and the nozzle area. The two add, and only one of them appears in any specification.
| Construction | Max fluid temperature |
|---|---|
| R7, R8 thermoplastic | 93 °C |
| 1SN, 2SN, 1SC, 2SC, 4SP, 4SH | 100 °C |
| R5, R12, R13, R15 | 121 °C |
| R14 PTFE | 204 °C |
Ageing is cumulative and irreversible, so a hose that spends its life warm is spending its life. That is why moulding machine hoses tend to fail in groups — they were fitted together, they aged together, and they arrive at the end together.
The cycle count nobody counts.
Why do injection moulding machine hydraulic hoses fail?
Heat and cycles rather than movement. Radiated heat from the barrel and heater bands ages the hose from outside while the fluid ages it from inside, and the pressure cycle repeats with every shot — so a short-cycle machine accumulates cycles far faster than mobile plant of the same age.
What to change, in order.
Cheapest first
The higher-rated hose is a real answer and it is rarely the first one.
If · A hose runs close to the barrel or heater bands
Move it, or put a shield between the two.
Radiated heat falls off quickly with distance. Centimetres matter.
If · The hall is hot as well
Look at ventilation around the machine before changing hose.
A machine in still, hot air has no way to lose the heat it radiates.
If · The oil runs hot
Check the cooler before specifying anything.
A silted cooler raises every hose temperature in the machine simultaneously.
If · Heat is genuinely unavoidable
Move to a 121 °C construction, or PTFE where it is severe.
The right answer where the heat cannot be designed out, and over-specified where it can.
IH-HOSE-R14 →
Where heat is the constraint
Hydraulic hose by grade
Rated to 100 °C, 121 °C and 204 °C.
Common questions
Should we just fit PTFE hose everywhere on the machine?
No. It is the right answer next to the barrel and over-specified on circuits that never see that heat. It is also stiffer and needs different fittings, so blanket substitution creates routing problems it did not have.
The hoses fail in the same area every time. Is that a bad batch?
Almost never. Failures clustered in one area point at a heat source in that area, and the fix is distance or shielding rather than a different supplier.
How do we set a replacement interval?
From your own failure history and cycle count rather than a calendar figure borrowed from mobile plant. Tagging assemblies with build dates is what makes that possible.
Can you build assemblies to a cleanliness standard?
Yes — tell us what the machine requires and we will build and cap to it rather than assuming a general-purpose clean is adequate.
Figures verified · Temperature ratings from the product specifications for the grades we stock. No machine-specific circuit pressures or cycle figures.
Machine consuming hoses?
Tell us where they run and what the fluid temperature is. Usually the answer is shielding and routing — and when it is a 121 °C construction, we stock those.
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