What is DAC and AOC ? And the differences ?
2025年1月17日Heat Shrinkable Closure,also called Heat Shrinkable Splice Closure, is kind of heat shrinkable system supplied with following accessories:
– Heat Shrink Sleeve
– Metal Canister (XAGA 1000/550) or Flat Cardboard Liner(XAGA 530/500)
– Self adhering aluminium strip(XAGA 1000/550)
– Channels with underclip (for 92/25 and above)
– Branch-off kit (optional)
– Abrasive strip
– Desiccant (silicagel)
– Aluminium foil
– Cleaning tissue
– Shield continuity wire
– Installation procedure
The heat shrinkable closure is specially designed for telecom and electrical copper cables jointing & splicing protection from environmental factors like moisture, dust, and mechanical stress. These heat shrinkable closures are typically made of heat-shrinkable materials that, when heated, shrink tightly around the cables to form a durable and reliable seal.
Heat Shrinkable Closure Key Featurees:
Durability: Provides long-lasting protection against harsh environmental conditions, up to 30 years.
Waterproofing: Ensures that the cable joints are safe from water ingress under temperature from -40°C to +110°C.
Ease of Installation: Can be installed quickly using a heat source like a torch or heat gun.
Universal compatability: Suitable for use with all connector systems,no matter UY connectors or 25 pair modules.
Wide Applications: Used in electrical power systems, telecommunication networks, and other industrial cable protection tasks.
Heat Shrinkable Closure History:
1. The Invention of Heat Shrink Technology (1950s-1960s)
Heat shrinkable materials were first developed by Paul Cook, an engineer and founder of Raychem Corporation in the 1950s. He discovered that certain plastics, such as polyethylene, could be “cross-linked” using radiation. This process made the material capable of shrinking to a pre-set size when heated.
Raychem introduced the first heat-shrinkable tubing in the late 1950s, which became widely used for electrical insulation and protection.
2. Application in Cable Joint Protection (1960s-1970s)
As telecommunications and electrical infrastructure expanded globally in the 1960s and 1970s, the demand for durable and reliable solutions to protect cable joints and splices grew. Heat shrinkable closures became a practical choice for protecting cable connections due to their:
Durable sealing against water, dust, and mechanical damage.
Easy installation (no need for adhesives or complex tools).
3. Advancements in Material Technology (1980s-1990s)
During this period, improvements in material science made heat shrinkable closures more durable and adaptable. For example:
- Better UV resistance for outdoor applications.
- Compatibility with high-voltage electrical systems.
- Wide use in fiber optic cables as telecom networks modernized.
4. Adoption Across Industries (2000s-Present)
Today, heat shrinkable closures are widely used in multiple industries, including:
- Telecommunications: Protecting fiber optic and copper cable joints.
- Electrical power systems: Insulating and waterproofing high-voltage cable joints.
- Automotive and aerospace: For wire harness protection.
These closures have become an essential component in modern infrastructure, especially in areas where reliability and environmental protection are critical.
Top 5 brands of Heat Shrinkable Closure Manufacturers
- CommScope (formerly TE Connectivity/Raychem): Known for their XAGA series of heat shrink closures, CommScope provides high-performance solutions for both maintenance and new constructions.
- 3M: 3M revolutionized cable protection with its heat shrinkable products, starting in the 1960s. Leveraging expertise in polymer science, 3M developed innovative solutions for insulation, sealing, and environmental resistance across industries like telecommunications, automotive, and energy. Today, 3M remains a leader, known for reliability, versatility, and sustainable advancements in heat shrink technology.
- Tianyu (TY) Heat Shrink: Specializing in heat shrink closures and cable repair sleeves since 1980S, Tianyu manufactures heat shrinkable closures,sleeves,tubes equivalent to CommScope’s XAGA series at reasonable cost, catering to diverse customer needs, covering more than 85 countries.
- KOSCHEM CO., LTD.: Established in 2001, this Korean company quickly rose to prominence as a rising star in the global heat shrinkable closure industry. KOSCHEM offered a wide range of heat shrinkable splice closures and related products, serving APAC markets such as Pakistan, UAE, Saudi Arabia, and Vietnam. However, the company has since disappeared from the market.
- Optotec S.p.A: founded in Italy,now part of STL group, specializes in advanced connectivity solutions for telecommunications networks. Renowned for its expertise in fiber optic technology, the company designs products like closures, termination boxes, and cabinets in Italy, but manufactures in China & India.
These manufacturers are recognized for their expertise in producing heat shrinkable closures, serving industries such as telecommunications, electrical power systems, and more.
The story of XAGA Series Heat Shrinkable Closures
The story of Raychem XAGA Series Heat Shrinkable Closures is a fascinating journey rooted in the development of heat-shrinkable materials and their application to meet the growing demands of the telecommunications and power industries. Here’s a brief history:
1. Birth of Raychem Corporation (1957)
The story begins with the founding of Raychem Corporation by Paul Cook, an engineer from MIT. Cook pioneered the use of radiation chemistry to create cross-linked polymer materials, which led to the invention of heat-shrinkable tubing. These materials had unique properties—they could shrink to a predetermined size when heated, creating a tight seal and robust protection.
2. Introduction of Heat-Shrinkable Closures (1960s-1970s)
As telecommunications infrastructure expanded globally, the need for reliable cable protection solutions increased. Raychem developed the XAGA series of heat-shrinkable closures during the 1960s and 1970s to address this need.
- XAGA Closures were designed to seal and protect cable joints and splices, providing exceptional protection against moisture, dust, and mechanical stress.
- These closures were particularly effective in harsh environments, such as underground installations and areas prone to flooding or extreme temperatures.
3. Adoption in Telecommunications (1980s)
With the rapid expansion of global telecommunications networks, including the rollout of copper and fiber optic cables, the XAGA series became a go-to solution for cable joint protection.
- The XAGA 500 and XAGA 550 series became industry standards for protecting cable joints in telephone networks and broadband infrastructure.
- The closures featured durable heat-shrink tubing with adhesive linings, ensuring watertight seals and long-term reliability.
4. Acquisition by TE Connectivity (1999)
In 1999, TE Connectivity (formerly Tyco Electronics) acquired Raychem Corporation. This acquisition allowed TE Connectivity to integrate Raychem’s innovative technologies into its broader portfolio of connectivity solutions.
- The XAGA series continued to evolve, benefiting from TE Connectivity’s advanced material science and engineering capabilities.
- TE Connectivity expanded the product line to include solutions for both copper and fiber optic cable systems, catering to the demands of modern telecommunications networks.
5. Acquisition by Commscope (2019)
- Commscope acquired TE Connectivity’s Telecom Solutions business in 2019.
- This acquisition included the XAGA series of heat shrinkable closures.
6. End of Life (2022)
Commscope owned and manufactured the XAGA series of heat shrinkable closures until June 30, 2022. Following the closure of their manufacturing plant in Belgium, Commscope discontinued the XAGA series. As a result, these closures are no longer in production and are gradually being phased out of the market.
The XAGA series’ continued success lies in its ability to adapt to evolving technologies while maintaining its core strengths: ease of installation, durability, and reliability.
Legacy and Impact
The XAGA series is more than just a product line—it’s a testament to the innovation and foresight of Raychem and TE Connectivity. It has played a critical role in building and maintaining the world’s telecommunications infrastructure, ensuring reliable connections in even the harshest environments.
Alternative Replacement for XAGA Heat Shrinkable Closures
The XAGA series from Raychem/TE/Commscope has long been a benchmark and trusted solution for telecommunications and utility companies looking to protect cable splices in various environments. Unfortunately, Commscope discontinued the XAGA series heat shrinkable closures and cable repair sleeves on June 30, 2022.
But don’t worry— as a professional manufacturer with nearly four decades of experience in heat shrinkable products, we offer a full range of alternative replacements for the XAGA series heat shrinkable closures and cable repair sleeves. Below are the details for your reference:
| Product | Commscope P/N | TY P/N | Remark |
| Heat Shrinkable Joint Closure System | XAGA 500 | RSBJ 500 | Fiber reinforced sleeve, non-pressurized network, flat cardboard liner |
| XAGA 530 | RSBJ 530 | Fiber reinforced sleeve, non-pressurized network, plastic foam liner | |
| XAGA 550 | RSBJ 550 | Fiber reinforced sleeve, non-pressurized network, metal (aluminum) canister | |
| XAGA 1000 | RSBA 1000 | Fiber reinforced sleeve, pressurized network | |
| Heat Shrinkable Tube | XCSM | RSY | Heat shrinkable tube with thermal adhesive |
| Cable Repair Sleeve | CWST/CWRT | RSBJW | Fiber reinforced wraparound sleeve for cable repair, without valve |
| RWPS-C | RSBJWQ | Fiber reinforced wraparound sleeve for cable repair, with valve |
Heat Shrinkable Closures
XAGA 1000 Heat Shrinkable Closure
For pressurized telecom copper cable jointing & splicing, with 2x semicircles metal canister and other accessories
XAGA 550 Heat Shrinkable Closure
For unpressurized telecom copper cable jointing & splicing, with 2x semicircles metal canister and other accessories
XAGA 530 Heat Shrinkable Closure
For unpressurized telecom copper cable jointing & splicing, with Hygroscopic liner and other accessories
XAGA 500 Heat Shrinkable Closure
For unpressurized telecom copper cable jointing & splicing, with flat laminated cardboard liner and other accessories
At TianyuLink, we pride ourselves on having a dedicated and experienced team with decades of expertise in the telecommunications industry.
We deeply understand the challenges and demands of this dynamic, ever-evolving field. That’s why our core mission is centered on connecting quality, service, and satisfaction—delivering excellence to both our valued employees and customers.
Don’t hesitate to reach us.