Fibre Optic Closure Tube (INSULTUBE Commercial)
Insultube-Commercial (GSF) is a heat-shrinkable tube used in fibre optic closure installation, designed to insulate and seal the cable inlet at the base of the closure, manufactured from cross-linked polyolefin material.
- Meets IP 68 (Ingress Protection)
- ASTM D638
- IP68
Dimensions & Drawings
INSULTUBE Commercial (GSF) insulates and seals the cable inlet at the base of a fibre optic closure, in cross-linked polyolefin.
Covered on this page
- Fibre Optics Closure - INSULTUBE commercial
Features & Benefits
- Resistance to weathering, moisture, contamination and adverse environmental conditions
- Hot melt adhesive provides a perfect environmental seal on cable sheath
- Resistance to UV rays, ozone, chemicals and solvents
- Lightweight and flexible; provides mechanical strain relief
- Easily re-enterable
- Meets IP 68 (Ingress Protection)
- GSF series selection chart
Applications
- Sealing the cable inlet at the base of a fibre optic closure
Standards & Compliance
- ASTM D638
- IP68
FAQs
Frequently Asked Questions
What is the Fibre Optic Closure Tube used for?
It is used for:
- Sealing the cable inlet at the base of a fibre optic closure
How is it installed?
Clean and degrease the surface, position the part, then shrink it with a gas torch or a hot-air gun: keep the heat moving round it with a smooth, brushing motion so it recovers evenly without scorching. Start at one end and work steadily along to the other.
Which standards and test methods are quoted for it?
These:
- ASTM D638
- IP68
Can I get a quote, a sample or a size that is not listed?
Send your cable details, quantity and application with the "Request a Quote or Sample" form at the foot of this page. For a size or variant that is not in the chart, describe what you need there, or use Technical support at the top of the page, and the technical team will confirm what can be supplied.

47+
Years manufacturing

100+
Countries served

140
Products in range

ISO 9001:2015
Certified & tested







