Silicone Rubber Cold Shrink Tubing for RF Connector and Solar Photovoltaic Mc4 Connector

Product Description

Silicone rubber cold shrink tube - special for photovoltaic connectors

Silicone rubber cold shrink tube, specifically designed for photovoltaic connectors, is an insulating sleeve made from special silicone rubber, pre-expanded over a removable support tube. Its very high expansion ratio allows it to accommodate the radial size differences between photovoltaic connectors and optical cables. When in use, simply position it and remove the support tube. It utilizes its radial shrinking force to form a tight encapsulation, providing insulation, dust prevention, waterproofing, and sealing effects

Support customization, ODM & OEM available

Applications for Offshore Photovoltaic MC4 Connectors-UV Resistant, Salt Spray Corrosion Resistant, Waterproof, Sealing

Features:

1. Continuous operating temperature: -55°C～180°C
2. Shrink Ratio : 6:1 or so. Suits for an extensive range of cable sizes because of the shrinkage
3. Retains its resiliency and pressure even after prolonged years of ageing and exposure, seals tight against moisture and water
4. Good weather resistance, ozone ageing, ultraviolet and salt mist corrosion resistance, performs stably under long-period exposure to the sun
5. Simple installation, requires no special heating tools, and adhesive to seal the connections
6. Standard color: black - Other colors can be customized

Click chat now to contact us for free samples

VR

Technical Performance

Properties	Typical Data	Test Method
Hardness	40±5	GB/T 531-2008
Tensile strength	≥7.0MPa	GB/T 528-2009
Tensile strength after aging MPa - 232℃×7 D	≥ 60% of initial value	/
Elongation at break	＞800%	GB/T 528-2009
Elongation at break after aging % - 232℃×7 D	≥25% of initial value	/
Tear strength	≥25kN/m	GB/T 529-2008
Volume resistivity	≥10 12Ω/m	/
Flammability	HB	UL 94
Requirements for UV/ light aging resistance test	Tensile strength ≥75% of initial value, no surface damage	/

Structure

Dimensions

Size	Inner Diameter - mm	Min Cable Outer Diameter - mm	Max Cable Outer Diameter - mm	Full Recovered Length - mm
VS-25*220	Ф25	6.0	20.0	220
	Ф25	6.0	20.0	175
Note: Special sizes & packing are available on request

Company Show

Suzhou Volsun Electronics Technology Co., Ltd. was founded in 2006. We keep focusing on the R&D, production and sales in insulation, sealing & protection solutions for over 20 years

Quality is our culture. Volsun has a modern quality management system, which has passed a series of quality system certification such as IATF16949, ISO9001 etc

Up to now, Volsun cooperated with customers from 88 countries, we offer suitable sealing, waterproof solutions for some well-know enterprises in communication, Automobile, Power industry etc

Quality Assurance

Our management and employees are committed to providing the highest quality products and services. This ongoing commitment is recognized through ISO9001, ISO14001, ISO45001, IATF16949, UL, ROHS, and REACH certifications. We employ rigorous quality assurance standards to guarantee our customers the highest quality standards

We also have the ability to be your just-in-time supplier. This helps you keep your production lines running and provides better cash flow management by eliminating inventory requirements

Because every manufacturer has different needs and challenges to overcome, we are committed to providing exceptional service to each of our customers. We will work with you to provide the best solution to meet your needs

Abroad Exhibition

Packing & Delivery

Trade terms	FOB, EXW, CIF, DDU, DDP, CFR
Payment terms	T/T, L/C, Negotiable
Supply capability	1,000,000 pieces per month
Lead time	Usually 2-3 working days
Shipment	Express, Air, Sea
Port	Shanghai, Ningbo, Shenzhen
Sample availability	Yes
Sample time	Usually 1-2 days
Packaging	Normal: Plastic bag & Carton & Pallet Special: Customized packing

FAQ

Q 1. How long is the payment term
A: We accept T/T 50% deposit and 50% balance against B/L or L/C copy at sight, also accept Western Union, VISA and Paypal

Q 2. What is the normal lead time for product orders
A: The average lead time for prototype/first piece is 7~10 days, if tooling is involved, the lead time for production tooling  is 10 days, and the average production time after sample approval is 2-3 weeks

Q 3. What is your standard packaging
A: All goods will be packed in cartons and loaded on pallets. Special packing methods are acceptable when needed

Q 4. Can you tell us the monthly production capacity of your products
A: It depends on the model, we produce more than 1500 tons of rubber materials per month

Q 5. What kind of certificates do you have
A1: We have ISO9001:2015, IATF16949:2016, ISO14001:2015, ISO45001:2018 certified
A2: We have various rubber compounds approved by UL, ROHS and REACH

Q6: How to check the quality of bulk order
A1: We provide pre-production samples to all customers before mass production if needed
A3: We accept third-party inspection, such as SGS, TUV, INTERTEK, BV, etc

Q 7: Can you provide customized service

A: Yes, we accept customization and can produce products in different sizes, packaging, colors according to requirements

Volsun Silicone Rubber Cold Shrink Tubing for RF Connector and Solar Photovoltaic Mc4 Connector

Volsun presents an advanced solution for sealing, insulating, and protecting critical electrical connections with our silicone rubber cold shrink tubing for RF connector and solar photovoltaic MC4 connector applications. Designed for professional installers, system integrators, and maintenance teams, Volsun silicone rubber cold shrink delivers reliable environmental protection, fast installation, and long-term performance for RF connector cold shrink and MC4 solar connector sleeve use cases.

Product Overview and Core Features

Volsun silicone rubber cold shrink tubing is specifically engineered to meet the demanding needs of RF connector cold shrink and MC4 solar connector sleeve applications. Manufactured from high-performance silicone rubber compound, this cold shrink tubing combines elasticity, UV resistance, and dielectric stability to protect sensitive connectors from moisture ingress, dust, and mechanical abrasion. The cold shrink tubing is supplied in a pre-stretched state on a removable core so that installers can simply remove the core and shrink the sleeve in place without heat, adhesives, or special tools.

Key features include:

- Durable silicone rubber formulation optimized for outdoor and indoor use.

- Simple peel-and-apply installation: no heat source required, enabling safe deployment in confined, hazardous, or weather-exposed environments.

- Excellent UV, ozone, and weather resistance to extend service life in solar farms and rooftop installations.

- Strong dielectric properties and low loss for RF connector cold shrink protection, maintaining signal integrity across operating bands.

- High elasticity and memory for secure sealing around varied connector geometries, including MC4 solar connector sleeve applications.

- Resistant to salt spray, humidity, and temperature extremes common in photovoltaic and telecom installations.

- Compact packaging and multiple size options to fit different RF connectors and MC4 solar connectors.

Applications and Use Cases

Volsun silicone rubber cold shrink tubing is ideal for a wide spectrum of applications where reliable environmental sealing and electrical insulation are critical. Typical deployments include:

- Solar photovoltaic systems: As a versatile MC4 solar connector sleeve, Volsun cold shrink tubing protects MC4 connectors and inline splices from water ingress and mechanical damage, reducing the risk of power loss and hotspot formation on PV strings.

- Telecommunications and RF systems: For RF connector cold shrink needs, Volsun provides a low-loss, weatherproof solution for outdoor feed-lines, antenna connectors, and base station cabling that preserves signal performance while preventing corrosion.

- Renewable energy installations: Cold shrink tubing is used on inverter connections, combiner boxes, and junction points to maintain system reliability across harsh environments.

- Industrial and marine environments: The corrosion-resistant properties of silicone rubber cold shrink make it suitable for marine and industrial installations where salt spray and chemical exposure are concerns.

- Temporary and emergency repairs: The rapid application of cold shrink tubing enables swift, secure repairs to critical cabling and connector assemblies with minimal downtime.

Technical Advantages and Innovation

Volsun cold shrink tubing combines material science with practical design to deliver measurable benefits over traditional sealing methods such as heat-shrink, liquid sealants, and tape wraps. The silicone rubber cold shrink approach offers several technical advantages:

1. Installation Safety and Speed

The pre-expanded silicone rubber design means no heat guns, torches, or curing times are required. Installers can apply RF connector cold shrink or MC4 solar connector sleeve solutions quickly and safely, minimizing labor costs and reducing the potential for heat-related damage to surrounding components.

2. Superior Environmental Protection

Silicone rubber provides a hydrophobic, flexible seal that resists cracking, embrittlement, and degradation under UV exposure. As a result, Volsun silicone rubber cold shrink tubing ensures long-term protection for outdoor connectors and reduces maintenance cycles for solar farms and telecom infrastructures.

3. Electrical Performance

For RF connector cold shrink applications, Volsun cold shrink maintains low dielectric loss and high insulation resistance, preserving the electrical characteristics of coaxial and RF assemblies. This makes it ideal for use on sensitive signal paths where maintaining impedance and minimizing reflections are crucial.

4. Mechanical Durability

The elasticity and memory of Volsun silicone rubber cold shrink ensure a tight, conforming fit that accommodates vibration, thermal expansion, and mechanical loading. The material resists abrasion and can protect connectors from physical damage in demanding environments.

5. Wide Temperature Range

Formulated to perform across broad temperature fluctuations, Volsun silicone rubber cold shrink remains flexible at low temperatures and stable at elevated temperatures, which is particularly important for rooftop PV arrays exposed to wide daily temperature swings.

6. Versatile Fit and Compatibility

Available in multiple diameters and shrink ratios, Volsun cold shrink tubing fits a variety of RF connector cold shrink and MC4 solar connector sleeve needs. The product can accommodate different cable gauges, connector contours, and splice configurations without custom tooling.

Installation Guidelines and Best Practices

To ensure optimal performance of Volsun silicone rubber cold shrink tubing for RF connector cold shrink and MC4 solar connector sleeve applications, follow these recommended steps:

- Clean connector surfaces to remove dust, oils, and residues for best adhesion and seal reliability.

- Select the appropriately sized cold shrink tubing to achieve full compression and sealing when the core is removed.

- Slide the pre-expanded silicone rubber over the connector or splice while the removable core is in place; preserve alignment with the targeted sealing area.

- Remove the core carefully to allow the silicone rubber to contract and form a tight, continuous seal around the connector body.

- Inspect the installed sleeve to verify full coverage and absence of voids. For additional mechanical protection, consider combining cold shrink with a gel-filled joint or mechanical housing in high-impact environments.

Quality Assurance and Compliance

Volsun maintains rigorous quality control processes and material testing to ensure consistent performance of our silicone rubber cold shrink products. Our cold shrink tubing undergoes accelerated aging, UV exposure, salt spray, and dielectric testing to verify suitability for outdoor and mission-critical applications such as solar PV installations and RF networks. Product specifications and test data are available upon request to support project planning and regulatory compliance.

Why Choose Volsun

Volsun silicone rubber cold shrink tubing stands out as a practical, high-performance choice for protecting RF connector cold shrink and MC4 solar connector sleeve needs. Our focus on material quality, manufacturing precision, and field-oriented design ensures that installers and system owners get a durable, low-maintenance solution that reduces downtime and enhances system reliability. Whether deployed across utility-scale solar fields, telecom tower sites, or industrial installations, Volsun cold shrink tubing delivers consistent, proven protection for electrical connectors.

Volsun is committed to continuous improvement and responsive customer support. Our technical team can assist with product selection, sizing guidance, and application recommendations to ensure that your installations leverage the full benefits of silicone rubber cold shrink technology