Product Types: Heat Shrink vs Cold Shrink
The same polymer in a different form is a different product. Ten forms below, each with how it installs, the problem it solves, when it should not be selected, and the inputs a buyer must supply. The form decides the installation crew and the maintenance story as much as the material decides the temperature.
Single-wall heat shrink tubing
How it installs. Slide over the part, apply hot air until full recovery; the cross-linked wall grips by elastic memory.
Problem it solves. Permanent electrical insulation, light mechanical cover and colour identification on straight or gently stepped runs.
When not to select. Where axial water sealing is needed (adhesive-lined instead), or where the site bans hot work.
Buyer inputs. Supplied and recovered ID targets, wall class, material family, colour, length.
Dual-wall adhesive heat shrink tubing
How it installs. Same as single-wall, but the heating step must melt the inner adhesive to full flow: underheating leaves the seal open.
Problem it solves. Environmental sealing: stops capillary water ingress at connectors, splices and jacket transitions.
When not to select. Dry, indoor, low-value positions where the adhesive adds cost for nothing; and positions that need later access.
Buyer inputs. Largest object to clear, grip OD, wet or dry duty, temperature of the sealed position.
Page → dual-wall 3:1/4:1
Moulded heat-shrink parts
How it installs. Recovered like tubing, but the moulded shape does the work: palm-and-finger boots over a cable crutch, caps over terminal heads.
Problem it solves. Geometry that defeats a straight tube: branch transitions, sharp lug edges, stepped profiles that would bridge or thin.
When not to select. If a straight tube recovers cleanly over the geometry, the tooling cost buys nothing.
Buyer inputs. Branch count and ODs (boots), conductor and lug sizes (caps), seal duty, orientation in service.
Pages → breakout boot · terminal head cap · endcap
Cold-shrink accessories
How it installs. The silicone body arrives pre-expanded on a spiral core; the installer winds the core out and the body recovers with zero heat.
Problem it solves. Cable terminations and joints where flames, heat guns or site power are restricted, and where uniform radial pressure matters at MV interfaces.
When not to select. Cost-critical LV positions where a heat-shrink kit does the same job cheaper, or when shelf-life discipline cannot be managed (the pre-expanded state ages).
Buyer inputs. Cable type and cross-section, core count, insulation OD, termination or joint, indoor/outdoor, voltage class.
Pages → 0.6/1 kV kits · 8.7/15 kV kits
Braided / textile sleeves
How it installs. Slip-on, self-wrap or velcro: no heat, expandable over connectors, installed on built or live-ended harnesses.
Problem it solves. Abrasion and organization; PET braid and textile flex with the harness for its whole life.
When not to select. Where a dielectric wall is required. Mesh and textile are mechanical protection only.
Buyer inputs. Bundle diameter range, motion type, access for install, colour.
Pages → PET braid · textile self-wrap · velcro wrap
Fiberglass / silicone sleeves
How it installs. Slip-on over the lead or hose end; some coated types expand over the part by their elastic braid.
Problem it solves. Continuous high temperature beyond polymer shrink tubes, plus a dielectric coat where specified (UL 1441 on the coated range).
When not to select. Where a sealed, conforming cover is required. Fiberglass does not shrink to the part, end sealing needs boots or tape.
Buyer inputs. Lead OD, continuous and peak temperature, bend radius, dielectric requirement.
Pages → silicone-coated fiberglass · extruded fiberglass · foil fiberglass pipe
Tape
How it installs. Wrapped by hand under tension; the composite insulation tape version recovers with heat after wrapping.
Problem it solves. Irregular shapes, repair positions and building-up layers where no tube passes over the end of the run.
When not to select. Volume production. Wrap quality varies with the operator, and time per position is far above tubing.
Buyer inputs. Width, substrate, temperature, whether the wrap is insulation or fixing.
Pages → composite insulation tape · silicone self-adhesive tape · aluminum foil tape · fiberglass tape
Busbar casing
How it installs. Heat-recovered like tubing but sized to rectangular bar sections; recovery runs end-to-end to avoid trapped air.
Problem it solves. Touch protection and phase identification on switchgear bus, with a heavy wall for creepage.
When not to select. Where the bus is energised during work (snap-on instead), or where joints need inspection access (connection box instead).
Buyer inputs. Bar width × thickness, voltage class, phase colours, run lengths with shrink margin.
Pages → MPG35 · MPG10
Snap-on insulation
How it installs. The split silicone tube snaps closed around the conductor by its own curl: no heat, no core, retrofit-friendly.
Problem it solves. Adding insulation on installed or energised-line hardware: worn spots, clearance fixes, bird-contact zones.
When not to select. Where a permanent sealed system is needed. Snap-on grips by elasticity and can be lifted at the seam by design.
Buyer inputs. Conductor OD over existing covering, voltage class, run length, live-line or gloved procedure.
Page → snap-on tube
Connection boxes / enclosures
How it installs. The two-part moulded box seats around the joint; cover clips or screws closed. Off again for thermography or re-torque.
Problem it solves. Enclosing bolted busbar joints. Restores the touch protection the joint breaks and keeps it inspectable.
When not to select. Continuous runs without joints: casing covers plain bar faster and cheaper.
Buyer inputs. Joint type (T/X/I/S/L), bar section, access need, quantity.
Page → MPH connection box
Frequently asked questions
When should I choose cold shrink over heat shrink?
Choose cold shrink when the site cannot have flames or hot work: pits, tunnels, live-facility rooms, or anywhere a permit for a heat gun costs more than the part. Cold-shrink bodies recover by withdrawing a support core - no heat, uniform radial pressure, no risk of burning adjacent cable. Choose heat shrink when cost per position matters at scale, when adhesive sealing is required, or when the kit design assumes recovery heat. They are installation philosophies, not interchangeable equivalents.
Why does a moulded part cost more than a straight tube of the same material?
Because the mould answers a geometry question a straight tube cannot. A breakout boot shapes one recovery across a cable crutch and several fingers; a terminal-head cap follows the lug profile so sharp edges sit inside the dielectric instead of against a thin wall. You pay for the tool that makes recovery follow the part. If a straight tube recovers cleanly over your geometry without bridging or thinning, buy the tube - the moulded part is justified only where geometry defeats it.
Which product forms can be removed for maintenance?
The openable ones: PET braided mesh, self-winding and velcro textile wraps, spiral fiberglass bellows, snap-on insulating tube, and the MPH connection box with its removable cover. Heat-shrink tubing, moulded parts and cold-shrink bodies are permanent - cutting them off is the removal path. Decide early whether the joint needs periodic access; retrofitting access later means re-insulating the position.