Industrial Heat-Shrink Tubing

Select tubing with an inner diameter slightly larger than the wire or connector before shrinking; check the stated recovered (shrunk) and expanded diameters and choose tubing that will provide a snug fit after heat is applied. Use measured conductor or bundle diameter plus insulation thickness, and select a shrink ratio (2:1, 3:1, 4:1) that provides enough reduction to fit over connectors but still contract tightly

Common materials are polyolefin (general-purpose, flexible, flame-retardant), PVC (lower cost, less heat resistance), and fluoropolymers (high chemical/temperature resistance). Choose higher shrink ratios (3:1 or 4:1) for uneven or larger connectors and polyolefin for a balance of heat resistance, electrical insulation, and mechanical protection in most industrial uses

Pick tubing with a maximum operating temperature above the highest expected environmental or operating temperature; many polyolefin types are rated for 125°C or higher. Apply heat evenly using a heat gun with a controllable temperature, keeping the gun moving to avoid overheating and scorching nearby components; follow manufacturer-recommended shrink temperatures when provided

Look for dual-wall tubing with an inner adhesive (heat-activated) for moisture and corrosion protection, thick-walled or reinforced tubing for mechanical/abrasion resistance, and flexible, high-elasticity materials for strain relief on moving or vibration-prone cables

Store tubing in a cool, dry place away from direct sunlight and solvents to prevent degradation; keep rolls or cut lengths flat or on spools to avoid kinks. Handle with clean hands or gloves to avoid contaminating adhesive-lined tubing and use proper cutting tools for clean edges to ensure reliable shrink and seal

Check for applicable standards such as UL, CSA, MIL-specs, or IEC ratings depending on your industry; review temperature ratings, flammability/flammability classifications (e.g., VW-1), dielectric strength, and chemical resistance specifications to ensure compliance with your application requirements

Prices vary by material, size, and specialty features; basic bulk polyolefin tubing is available at lower cost in packs under $50, while specialty adhesive-lined, high-temperature, or military-spec tubing can range higher. Consider buying multi-size kits or bulk rolls if you need many pieces to lower per-unit cost