PTFE Heat Shrink vs Spaghetti Tubing: Which to Use
We supply both, and buyers mix them up in the same enquiry. A heat shrink tube recovers onto the part and holds it. A slide on tube stays loose and protects it. One grips, one does not.
The difference, dimension by dimension
| Property | PTFE heat shrink | PTFE spaghetti tubing |
|---|---|---|
| How it is fitted | Slide on oversize, then recover with heat | Slide on at the finished diameter |
| Fit after installation | Tight, conforms to the part | Loose, stays as a sleeve |
| Sealing | Not by itself. Only a dual wall build seals | None |
| Retention | Held by the recovered grip | Held by the ends or by the assembly |
| Re-work | Cut away | Slide off and reuse |
| Chemical and temperature duty | Same fluoropolymer class | Same fluoropolymer class |
| Sizing basis | Supplied ID and recovered ID both matter | Supplied ID only |
| Best for | Insulating a joint, adding a skin over a component | Routing a wire through a hot or aggressive zone |
Both are fluoropolymer, so the chemistry behind the choice is shared: the same resistance class and the same -65°C to +260°C continuous range across the PTFE, FEP and PFA grades, supplied to UL94 V0 and MIL-I-23053. What separates them is whether the tube has to grip.
Which to specify
- Ask whether the tube has to grip. Grip points to heat shrink, protection without grip points to spaghetti tubing.
- Ask whether it has to seal. Only a dual wall build seals. Otherwise plan a separate seal at the ends.
- Ask how often the assembly is opened. A part on a maintenance cycle favours the slide on tube.
- Check the temperature and chemistry at the point of contact, which both products have to meet.
- Send the largest section the tube must pass and, for heat shrink, the smallest section it must close on.
Sizing and cost
A heat shrink tube is ordered with both dimensions in mind, so the wall is spent where it is needed and the recovered grip is part of what you are buying. A slide on tube is ordered on ID alone. Where a joint has to be insulated and held, the grip is the whole reason for the higher price.
The same distinction runs through the rest of the range and is set out in sleeving vs heat shrink for wire harness, with the product families listed on product types explained.
What to send
Tell us whether the tube grips or protects, the diameters at both ends, the length and the chemistry. We return the product and the size, and we say which of the two it is.
Frequently asked questions
Does spaghetti tubing seal?
No. It slides on at the finished diameter and stays loose, so there is no recovered grip and no seal. Where a seal is needed, plan it separately or use a dual wall heat shrink build.
Can I reuse heat shrink tubing?
No. Once recovered, the tube holds the shape it took and it is cut away to be removed. That is why a part on a maintenance cycle often suits the slide on tube instead.
Which one is cheaper?
The slide on tube, because it is ordered on ID alone and there is no recovered grip to size for. Heat shrink costs more because both the supplied and the recovered diameters are engineered.
Do both handle the same chemicals?
Yes. Both are fluoropolymer in the same chemical resistance class and the same -65°C to +260°C continuous range, so the chemistry is not what separates them.
What if I need protection and a seal together?
Use a dual wall heat shrink build where the liner flows and seals at the ends, or add a separate seal to a slide on sleeve. Send the requirement and we return the build.