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Electrical & Electronics

Cold Shrink Tubing

Product: Cold‑shrink Tubing | EPDM / Silicone Rubber

Core Design: Removable PA pull‑out support core

Installation: Tool‑free cold fit, no heating required

Product Detail | Technical Information | Packaging | More

Product Detail

Shanghai Mac Corporation is a leading Cold Shrink Tubing manufacturer and supplier.

Cold Shrink Tubing, also referred to as cold‑shrink sleeve, is a rubber‑based cable accessory pre‑expanded over a removable PA support core. It is available in EPDM rubber and silicone rubber material options. Unlike heat‑shrink products that require open‑flame heating tools for installation, this component relies on the retractive force of stretched rubber material. Operators pull out the inner PA core on‑site, and the rubber tubing shrinks tightly onto cable surfaces without torches or heat‑generating equipment. This product fits field‑built power and communication cable joints, cable terminations and cable repair splices, both for indoor setup and exposed outdoor deployment. It addresses common on‑site difficulties: restricted working space, no accessible power source for heating gear, safety risks brought by open‑flame operation, and poor environmental sealing after cable connection. It blocks moisture, dust and ultraviolet exposure from penetrating cable interfaces, stabilizes electrical insulation performance for long‑term cable operation.

If you want to know more about our Electrical & Electronics products or Cold Shrink Tubing price please feel free to contact us, we will reply you within 24 hours.

1. Material Composition: Cold Shrink Tubing body is made from EPDM rubber or silicone rubber.

2. Internal Structure: Consists of outer pre‑expanded rubber tubing and inner disposable PA support core.

3. Continuous working temperature: ‑55℃ to +125℃. Shrinking ratio covers 2:1 ~ 3:1.

4. Available inner diameter sizes range from 6mm up to 120mm.

5. Tensile strength ≥5MPa. Elongation at break ≥300%.

1. Stable Radial Compression Force: Maintains steady squeezing pressure against cable surfaces after core removal.

2. Flame‑free Assembly Condition: Relies on rubber retraction instead of heat sources to complete installation.

3. Wide‑range Environmental Adaptability: Rubber body tolerates repeated temperature cycling, ultraviolet rays and ozone exposure.

4. Dimension Compatibility For Multi‑size Cables: Given its 2:1‑3:1 shrink ratio, one single tubing can cover multiple outer‑diameter cable ranges

5. Integrated Insulation & Barrier Function:Rubber material delivers dielectric insulation and blocks moisture and dust ingress at the same time.

1. Low‑voltage Power Cable Joints Used for on‑site connection of low‑voltage power cables inside buildings and distribution cabinets. It fits because no heating tool is needed in confined cabinet space. EPDM cold shrink tubing is the recommended option.

2. Outdoor Telecommunication Cable Terminations Applied to aerial and buried communication cable end connections in open‑air outdoor environments. It resists UV and moisture intrusion for long‑term exposed deployment. EPDM grade is preferred for this condition.

3. Medium‑voltage Cable Repair Splices Deployed to fix damaged insulation sections on medium‑voltage power cables in power stations and substations. Its stable radial force maintains sealing under temperature swings. Silicone cold shrink tubing is recommended.

4. Explosion‑prone Site Cable Connections For cable joint work inside refineries, chemical plants and gas stations where open flame is forbidden. Flame‑free installation eliminates ignition risk during field work. Either EPDM or silicone can be selected according to local temperature.

5. Rail Transit Cable Interfaces Serves cable termination points on railway and subway signal & power circuits. It copes with frequent thermal cycling and vibration from vehicle operation. Silicone cold shrink tubing is suggested.

Production Process

Formula → Plasticating → Mastication & Mixing → Open‑mill Mixing → Heat Milling → Filtration → Vulcanizing Agent Addition → Thin Pass Milling → Extruding Strips → Extrusion → Vulcanization → Length Setting → Cutting → Expansion → Finishing → Inspection → Packaging

Voltage Class	Conductor Quantity & Application	Cable Crosssectional Area(mm2)	Insulation Outer Diameter(mm)
8.7/15(17.5)kV (6/10(12)6.35/11(12)kV)	1, 3	25-50	16.0-20
	Indoor Termination	70-120	20.5-25
		150-240	25.5-30
		300-400	30.5-36
		500-630	36.5-43
	1, 3	25-50	16.0-20
	Outdoor Termination	70-120	20.5-25
		150-240	25.5-30
		300-400	30.5-36
		500-630	36.5-43
12/20(24)kV (12.7/22(24)kV)	1, 3	25-50	18.0-22
	Indoor Termination	70-120	22.5-27
		150-240	27.5-32
		300-400	32.5-38
		500-630	38.5-45
	1, 3	25-50	18.0-22
	Outdoor Termination	70-120	22.5-27
		150-240	27.5-32
		300-400	32.5-38
		500-630	38.5-45
18/20(36)kV (18/30(36)&19/33(36)kV)	1, 3	35-70	25.5-30
	Indoor Termination	95-185	30.5-36
		240-400	36.5-43
		500-630	43.5-48
	1, 3	35-70	25.5-30
	Outdoor Termination	95-185	30.5-36
		240-400	36.5-43
		500-630	43.5-48
26/35(40.5)kV (20.8/36(42)kV)	1, 3	50-95	30.5-36
	Indoor Termination	120-240	36.5-43
		300-400	43.5-48
		500-630	48.5-55
	1, 3	50-95	30.5-36
	Outdoor Termination	120-240	36.5-43
		300-400	43.5-48
		500-630	48.5-55

Standard Packaging

Each cold shrink tubing unit is individually packed in transparent PE plastic bag with product label marking size, material and batch number. Quantified units are packed into corrugated export cartons. Cartons are stacked and strapped onto fumigated wooden pallets for overseas shipment. Carton dimension and gross weight are printed on outer carton surface.

Shipping

We support FCL and LCL sea freight, air freight and international express delivery, subject to order volume and destination port.

Available trade terms: **EXW, FOB, CIF**. Other terms may be available upon request.

Shipping cost will be calculated according to cargo volume, gross weight, destination location and selected transport mode.

Lead Time

Samples: 3‑7 working days

Standard orders: 15‑25 working days

Customized orders: 25‑40 working days

Q1: What is the difference between cold‑shrink tubing and heat‑shrink tubing?

A: Cold‑shrink tubing relies on pre‑stretched elastic rubber and removable plastic core for installation; no heat or torch is required. Heat‑shrink tubing needs heat source like hot‑air gun to shrink. Cold‑shrink works well for flame‑forbidden, narrow‑space field jobs; heat‑shrink has lower unit cost for general indoor projects.

Q2: What information do you need for a custom quotation?

A: Please provide inner diameter, working length, material (EPDM or silicone), required quantity, target application, and destination country. Special requirements like printing or modified hardness shall also be noted.

Q3: How do I install cold‑shrink tubing?

A: Slide the pre‑expanded cold‑shrink tube over the prepared cable joint / termination position, align it correctly, then steadily pull out the inner plastic support core. The rubber tubing will auto‑shrink tightly onto cable insulation. No heating tools are needed. Proper cable surface cleaning is required before installation.

Q4: What are the main advantages of cold‑shrink tubing?

A: Installation requires no open flame or heat gun, improving safety in hazardous‑area works. It maintains consistent radial compression over long service life, tolerates thermal expansion and contraction of cables. It fits confined cabinet spaces and reduces on‑site installation errors compared with heat‑shrink solutions.

Q5: What is the difference between EPDM and silicone cold shrink tubing?

A: EPDM features good UV‑resistance and cost‑performance, suited for general‑purpose outdoor cable joints and terminations. Silicone stands for wider temperature tolerance, better vibration resistance, fit for medium‑voltage, rail transit and high‑temperature working conditions.

Q6: What details do I need to offer for you to recommend suitable cold‑shrink tubing for my project?

A: Please share voltage class, cable insulation OD, working environment (indoor / outdoor / explosive area), expected operating temperature and application type: termination or splice.

Q7: What key factors should I consider to select proper cold shrink tubing for cable termination?

A: Confirm cable insulation outer diameter, operating voltage grade, working temperature range, working environment (indoor / outdoor, UV‑exposed or explosion‑risk area). Choose EPDM for general outdoor use and silicone for high‑temperature or heavy‑vibration conditions.

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