Flange Isolation Kit Sleeves (PET / Mylar)
PET (Mylar) bolt sleeves as flange isolation kit components -- the dielectric break that stops galvanic corrosion on bolted pipeline and tank flanges.
A flange isolation kit separates two flanges (and the bolts) so stray current and galvanic action cannot eat the joint. The bolt sleeve is the part that is most often wrong: too short, wrong diameter, or missing from the kit entirely. We supply PET (Mylar) bolt sleeves made to the bolt callout and packed to count, so the isolation is continuous from flange face to nut.
The buyers are flange-isolation-kit manufacturers, gasket-kit OEMs, pipeline-corrosion suppliers, cathodic-protection companies and the valve/flange distributors that serve them -- concentrated in the Middle East but also North America and the North Sea. We lead by solving the fit-and-completeness problem, not by selling film by the metre.
Technical specifications
| Component | Bolt insulation sleeve for isolation kits |
| Material | PET (Mylar) film tube (PTFE on request) |
| Bolt sizes | M6 to M36, ANSI / DIN variants |
| Length | Cut to bolt length |
| Supply form | Counted, kitted component |
| Function | Dielectric break on bolted flanges |
| Markets | Middle East, North America, North Sea |
Applications by industry
- Pipeline flange isolation kits
- Storage-tank and vessel flange isolation
- Cathodic-protection assemblies
- Gasket-kit and flange-kit OEM supply
- Oil and gas valve and flange corrosion control
- Buried and submerged bolted joints
Why the bolt sleeve decides kit quality
Washers and a gasket isolate the flange faces, but the bolts still bridge the gap unless the sleeve is correct. If the sleeve is too short or missing, the stud touches metal and the isolation fails at the exact point meant to be protected. Supplying the sleeve cut to the bolt and packed to count turns a common failure into a non-event, and it is far cheaper than PTFE for the bulk of standard-duty flanges.
Kit completeness and fit review
We size the sleeve inner diameter to the bolt shank and the length to the full stud, then pack to the bolt count for the kit. State the bolt callout and the number of bolts per flange; we deliver a counted set, not a length to be cut on site.
Inspection and traceability
We state the control plan with you. Batch traceability links the film lot to the finished sleeve and the inspection record.
- Bolt size and standard verified to order
- Length cut to full bolt specification
- Packed to bolt count for kits
- Lot traceability to incoming film certificate
- Kit completeness check on request
Related components
Mylar Bolt Insulation Sleeve
Main product page.
Mylar Bolt Sleeve Sizes M6-M36
Size and dimension reference.
Mylar / PET Film Insulation Tube
General PET film tubes.
Common questions
What is a flange isolation kit sleeve for?
It provides the dielectric break on the bolts so stray current and galvanic corrosion cannot bridge the flanged joint.
PET or PTFE sleeve for kits?
PET for standard flange duty at lower cost; PTFE for higher temperature or chemical exposure.
Can you kit sleeves to bolt count?
Yes. Sleeves are cut to bolt length and packed to the bolts-per-flange count.
Which markets do you serve?
Middle East first, plus North America and the North Sea oil-and-gas and pipeline sectors.
What bolt sizes are covered?
M6 to M36 with ANSI and DIN variants; other sizes on request.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Flange Isolation Kit Sleeves (PET / Mylar)
Send the bolt callout, bolts per flange and kit quantity. We cut and pack the sleeves to count.