3: 1 Heat Shrink Tube
RoHS
Black,Red,Yellow,Blue,etc
Optical Cable, Cable Protection
Halogen-Free Polyolefin Hydrocarbon
Adhesive Heat Shrink Tube
Single Item
3:1
≥60ºC
≥105ºC
Flame Retardant, Outer Layer, UV Resistant, Soft
Zhonghe
Paper Tray + Carton
China
3917330000
Product Description
Polyolefins Double-Wall Adhesive Heat Shrink Tube 3: 1 for Cable Protection



Double-wall heat shrink tubing is made of soft polyolefin and hot melt adhesive co-extrusion. The outer layer of polyolefin is an insulating, halogen-free, flame-retardant material, and the inner layer of hot melt adhesive can buffer mechanical strain and has strong sealing properties. It is used for insulation protection of wires and cables, wiring and connectors that need to be sealed, waterproof and moisture-proof. It can be well applied to many industries such as electronics, automobiles and communications.
Product Features
*Shrinkage ratio:3:1 or 4:1
*Excellent hot melt adhesive and high shrinkage ratio provide excellent sealing
*Sealing and insulation protection for electronic connection applications
*Easy to repair damaged insulation layer without removing the connector
*Continuous use temperature range: -55ºC ~ 125ºC
*Starting shrinkage temperature: 80ºC
*Minimum complete shrinkage temperature: 110ºC
Product Features
*Shrinkage ratio:3:1 or 4:1
*Excellent hot melt adhesive and high shrinkage ratio provide excellent sealing
*Sealing and insulation protection for electronic connection applications
*Easy to repair damaged insulation layer without removing the connector
*Continuous use temperature range: -55ºC ~ 125ºC
*Starting shrinkage temperature: 80ºC
*Minimum complete shrinkage temperature: 110ºC
Item | Index requirements | Test Method | Typical Value |
Longitudinal shrinkage (200±5ºC 3minute) | ±10% | ASTM D 2671 | ±7% |
Eccentricity | ≤35% | ASTM D 2671 | 15% |
Tensile Strength | ≥9.0MPa | ASTM D 638 | 10 MPa |
Elongation at break | ≥250% | ASTM D 638 | 500% |
Elongation at break after aging (Heat aging 158ºC,168hours) | ≥100% | ASTM D 638 | 300% |
Thermal shock (4hours,200±5ºC) | No cracks, no flow, no dripping on the outer layer | ASTM D 2671 | pass |
Low temperature flexibility (-55ºC,4hours) | No cracks | ASTM D 2671 | pass |
Dielectric Withstand Voltage and Breakdown | 2500V,60sec,No breakdown | ASTM D 2671 | pass |
Volume resistivity | ≥1012Ω·cm. | ASTM D 876 | 1014Ω·cm |
Copper corrosion (16 hours,121±2ºC | No corrosion | ASTM D 2671 | pass |
Copper stability(158ºC,168hours) | Elongation≥100% | ASTM D 2671 | pass |
Flame retardant properties | Vertical combustion-V0,Horizontal burning-HB | AMS-DTL-23053/5 | pass |

Specification | Before Shrink(mm) | After Shrink(mm) | |||
Inner Diameter D | Wall Thickness T | Inner Diameter d(max) | Wall Thickness t1+t2 | ||
3:1 | Φ1.6 | 2.20±0.20 | 0.30±0.10 | 0.70 | 0.60±0.15 |
Φ2.4 | 3.00±0.20 | 0.35±0.10 | 0.80 | 0.70± 0.15 | |
Φ3.2 | 4.00±0.20 | 0.40±0.10 | 1.05 | 1.00±0.15 | |
Φ4.8 | 5.50±0.30 | 0.45±0.10 | 1.60 | 1.10±0.15 | |
Φ6.4 | 7.30±0.30 | 0.50±0.10 | 2.10 | 1.25±0.15 | |
Φ7.9 | 8.30±0.30 | 0.55±0.15 | 2.70 | 1.30±0.20 | |
Φ9.5 | 10.4±0.40 | 0.55±0.15 | 3.10 | 1.35±0.20 | |
Φ12.7 | 13.5±0.50 | 0.60±0.15 | 4.20 | 1.60±0.20 | |
Φ15.4 | 16.5±0.50 | 0.65±0.18 | 5.10 | 1.75±0.25 | |
Φ19.1 | 20.5±0.50 | 0.70±0.18 | 6.30 | 1.85±0.25 | |
Φ25.4 | 26.5±0.50 | 0.75±0.18 | 8.40 | 2.05±0.25 | |
Φ30 | 32.0±1.00 | 0.75±0.18 | 10.0 | 2.10±0.25 | |
Φ39 | 41.0±1.00 | 0.85±0.20 | 13.0 | 2.55±0.30 | |
Φ50.8 | 53.0±1.00 | 0.85±0.20 | 17.2 | 2.75±0.30 | |
Φ64 | 67.0±2.00 | 0.90±0.20 | 21.3 | 2.80±0.30 | |
4:1 | 4/1 | 4.30±0.20 | 0.40±0.10 | 1.00 | 1.10±0.15 |
6/1.5 | 6.40±0.20 | 0.45±0.10 | 1.50 | 1.30±0.15 | |
8/2 | 8.30±0.30 | 0.50±0.15 | 2.00 | 1.35±0.20 | |
12/3 | 13.3±0.30 | 0.55±0.15 | 3.00 | 1.75±0.20 | |
16/4 | 16.4±0.40 | 0.60±0.15 | 4.00 | 1.85±0.20 | |
20/5 | 20.5±0.50 | 0.65±0.20 | 5.00 | 2.10±0.30 | |
24/6 | 26.0±0.50 | 0.65±0.20 | 6.00 | 2.20±0.30 | |
32/8 | 32.8±1.00 | 0.75±0.20 | 8.00 | 2.60±0.30 | |
40/10 | 41.0±1.00 | 0.80±0.20 | 10.0 | 2.80±0.30 | |
52/13 | 53.0±1.00 | 0.80±0.20 | 13.0 | 2.90±0.30 | |
60/15 | 62.0±2.00 | 0.90±0.20 | 15.0 | 3.30±0.30 |

Factory Profile.
Established in 2010, Dong guan Zhong he Electronics Co., Ltd. is a high-tech enterprise and professional manufacturer that is specializing in the production, R&D and sales of Cable Sleeves as well as providing protection solutions for our customer.Our headquarters is in Qing xi Town of Dong guan City. In 2020, we set up Suzhou Zhong he New Energy Technology Co., LTD in Jiangsu.Our main products including Corrugated Pipe, Braided Sleeves, Self-rolling Sleeves, Heat Shrink Tube, Cold Shrink Tube, Fiber Tubes and accessories.
Up to now, we have served more than 3000 brands and our products are exported to 102 countries all over the world. 60 million meters of the Cable Sleeves we producing each year was applied to various types of automotive OEMs and Wiring manufacturer. Our strategic cooperation customers include BYD, Yutong Bus, AVIC and other well-known domestic and foreign enterprises and listed companies.
Up to now, we have served more than 3000 brands and our products are exported to 102 countries all over the world. 60 million meters of the Cable Sleeves we producing each year was applied to various types of automotive OEMs and Wiring manufacturer. Our strategic cooperation customers include BYD, Yutong Bus, AVIC and other well-known domestic and foreign enterprises and listed companies.


01 : Why choose us?
A:1.We have more than 15 years of experience in this industry!
2.Research and development capacity- We have one of technical team who can develop and design the product according to the requirements of customers!
3.We have a professional sales team to provide excellent service for you!
02 : What's the MOQ for your production?
A: We accept both large and small order, please contact us for details.
03: Can l expect to get the sample?
How long can l expect to get it?
A: Sure, Free samples can sent to you for test. About 4-6 days.
Shipment according to distance and courier company.
04 : Can you do the design for us?
A: Yes, We are a professional manufacturer who can design for you.
05 : What's your payment term?
A: 30% T/T Deposit +Balance before Shipment.
06 : What's the list of certificates you hold?
A:IATF16949, RoHS, CE, EN45545 Test Report, ELV Test report.
2.Research and development capacity- We have one of technical team who can develop and design the product according to the requirements of customers!
3.We have a professional sales team to provide excellent service for you!
02 : What's the MOQ for your production?
A: We accept both large and small order, please contact us for details.
03: Can l expect to get the sample?
How long can l expect to get it?
A: Sure, Free samples can sent to you for test. About 4-6 days.
Shipment according to distance and courier company.
04 : Can you do the design for us?
A: Yes, We are a professional manufacturer who can design for you.
05 : What's your payment term?
A: 30% T/T Deposit +Balance before Shipment.
06 : What's the list of certificates you hold?
A:IATF16949, RoHS, CE, EN45545 Test Report, ELV Test report.