What is the difference between 2:1 and 3:1 heat shrink tubing?

2:1 heat shrink tubing shrinks to half its original diameter and is ideal for general electrical insulation, wire bundling, and color coding. 3:1 dual wall tubing shrinks to one-third and includes an inner hot-melt adhesive liner that creates a permanent waterproof seal — the professional choice for marine wiring, outdoor connections, and moisture-critical applications in the USA, Canada, and UK.

Which heat shrink tubing is best for marine wiring?

For marine wiring, use 3:1 dual wall adhesive-lined heat shrink tubing. The inner hot-melt adhesive melts when heated and flows around the wire and connector, creating a 360° waterproof seal that blocks saltwater, bilge moisture, and corrosion. Single-wall 2:1 tubing does not create a watertight seal and should not be used in bilge or outdoor exposed applications.

What sizes of heat shrink tubing does Helixal offer?

Helixal heat shrink tubing is available in 13 sizes: 3/32", 1/8", 3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1", 1-1/4", 1-1/2", and 2". All three product lines are in stock with fast direct delivery across the USA, Canada, and UK.

Does Helixal ship to the UK and Canada?

Yes. Helixal ships direct to the United States, Canada, and the United Kingdom. All 39 SKUs are in stock with fast delivery. Wholesale orders for UK and Canadian distributors are also supported — contact us via WhatsApp for volume pricing.

Heat
Shrink
Tubing.

Two ratios. Thirteen sizes. One standard. Industrial-grade heat shrink verified by lot — sold direct. Ships fast across the USA & Canada.

Total SKUs: 39
Ratios: 2:1 / 3:1
Voltage: 600V
Certification: UL · RoHS · SGS

LINE · 01Single-Wall

2:1
Standard

600V120°CFlame RetardantUL · RoHS

Shop 13 sizes →

LINE · 02Dual-Wall · Adhesive

Helixal 3:1 Dual Wall Adhesive-Lined Heat Shrink Tubing — Large Rolls

3:1
Heavy Duty

Adhesive Lined360° WaterproofMarine Grade3:1 Ratio

Shop 3:1 sizes →

39 SKUs · in stock · ships direct

The Catalogue

Helixal heat shrink tubing — 2:1 standard & 3:1 dual-wall adhesive-lined. 13 sizes, 3 roll lengths.

39 SKUs · in stock · ships in 24h

3:1LINE · 01

3:1 Dual Wall Adhesive Lined

Large Rolls — 20–60 ft

13 SizesAdhesive Lined360° Waterproof

★★★★★4.8 · 200 reviews

From $18.99per roll

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2:1LINE · 02

2:1 Standard Heat Shrink

Large Rolls — up to 120 ft

13 SizesUL ListedHigh Volume

★★★★★4.7 · 183 reviews

From $15.49per roll

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3:1LINE · 03

3:1 Dual Wall Short Packs

10 ft per Size

13 Sizes10 ft RollsSpot Repairs

★★★★★4.8 · 119 reviews

From $16.89per roll

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Shop by Size

Heat Shrink Tubing — Every Size & Line.

Helixal heat shrink tubing — 2:1 standard and 3:1 dual-wall adhesive-lined. 13 sizes from 3/32" to 2". Select a product line below to find your exact size.