Resistant to Salt Spray Acid and Alkali Corrosion IP68 Waterproof Cold Shrink Tube for PV 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 presents the Resistant to Salt Spray Acid and Alkali Corrosion IP68 Waterproof Cold Shrink Tube for PV MC4 Connector, a purpose-built solution that redefines long-term protection for photovoltaic connections. Designed to meet the rigorous demands of modern solar installations, the Volsun PV MC4 cold shrink tube provides dependable environmental sealing while delivering superior salt spray corrosion resistance and acid alkali resistant PV tubing performance. Combining IP68 waterproof connectors capability with robust materials and an easy-to-install cold shrink design, this product is ideal for rooftop, ground-mount, and offshore solar arrays where reliability and durability are non-negotiable.

Product overview and design philosophy

The Volsun PV MC4 cold shrink tube is engineered around a cold shrink concept that eliminates on-site heat application and simplifies field assembly. As PV MC4 cold shrink tube technology advances, installers demand components that reduce installation time without compromising performance. Volsun answers this demand by offering an IP68 waterproof connectors solution that slips over PV MC4 connectors and recovers tightly, creating a permanent, impermeable seal. The cold shrink tube body is formulated as acid alkali resistant PV tubing, providing chemical resilience to industrial pollutants, agricultural runoff, and marine environments. The salt spray corrosion resistance of the material has been validated through accelerated testing, ensuring the tube maintains structural integrity and continues to protect electrical contacts under prolonged exposure.

Materials and technical advantages

Volsun selected elastomeric compounds and specialized sealing blends to achieve both salt spray corrosion resistance and acid alkali resistant PV tubing characteristics. The elastomer resists degradation from sodium chloride aerosols that typically accelerate corrosion in coastal and offshore settings. In addition, the material chemistry is formulated to withstand acidic and alkaline contaminants, ensuring the PV MC4 cold shrink tube resists pitting, cracking, and softening when exposed to harsh chemical environments. The IP68 waterproof connectors performance is achieved through precise memory elastomer recovery, which compresses against the connector bodies and cable insulation to block water ingress at submersion depths and over extended periods. The combined properties of salt spray corrosion resistance and acid alkali resistant PV tubing make this product particularly suitable for utility-scale solar farms, commercial rooftops in industrial zones, and marine-adjacent installations.

Installation benefits and field performance

One of the most significant practical advantages of the Volsun PV MC4 cold shrink tube is rapid, safe installation. Unlike heat-shrink alternatives, the cold shrink tube requires no open flame, heat gun, or specialized equipment, reducing safety hazards and simplifying logistics on-site. Installers merely expand the pre-stretched cold shrink tube over the connector, slide it into position, and allow the inner core to be removed, enabling the tube to recover and form a tight seal. This process preserves the connectors’ factory-rated torque and mechanical stability while delivering IP68 waterproof connectors performance that meets demanding environmental standards. Field crews appreciate the speed and reliability: fewer steps, no curing time, and predictable outcomes even in low-temperature conditions where heat shrink methods may under-perform.

Applications in challenging environments

The Volsun product excels where salt spray corrosion resistance matters most. Coastal solar arrays and offshore platforms face continual exposure to saline aerosols that hasten metallic corrosion and compromise connector integrity. By using PV MC4 cold shrink tube technology with proven salt spray corrosion resistance, operators can meaningfully extend maintenance intervals and reduce the incidence of moisture-related failures. Similarly, installations near industrial complexes often encounter acidic or alkaline airborne contaminants. The acid alkali resistant PV tubing formulation provides a chemical barrier that protects connectors from corrosive agents, preserving electrical continuity and minimizing the need for early replacement. The IP68 waterproof connectors capability also ensures system resilience in flood-prone areas, utility trenches, and locations with heavy seasonal rainfall.

Long-term reliability and lifecycle considerations

Volsun’s approach is to maximize lifecycle value. The PV MC4 cold shrink tube’s combination of salt spray corrosion resistance, acid alkali resistant PV tubing, and IP68 waterproof connectors performance yields measurable improvements in expected service life for PV interconnections. Reduced ingress and chemical attack translate into fewer failure modes related to insulation breakdown, contact corrosion, and short circuits. The result is a stronger return on investment through lowered operational expenditures and extended intervals between preventative maintenance cycles. For asset owners focused on sustainability and uptime, incorporating resilient components such as this cold shrink tube helps preserve energy yield and reduces the environmental footprint associated with component replacement.

Quality assurance and standards compliance

Volsun subjects each batch of PV MC4 cold shrink tube to rigorous testing to verify salt spray corrosion resistance, acid alkali resistance, and waterproof performance consistent with IP68 waterproof connectors requirements. Test regimes include extended salt spray exposure, immersion testing at depth, accelerated chemical exposure to acidic and alkaline solutions, and mechanical cycling to simulate long-term thermal and vibration stresses. These quality assurance steps provide installers and system designers with the confidence that the cold shrink tube will perform as specified across the lifecycle of a PV installation. Manufacturing controls ensure that the acid alkali resistant PV tubing retains uniform recovery characteristics, adhesion to cable jackets, and dimensional stability under UV and temperature extremes.

Customization and compatibility

Understanding that PV systems vary widely, Volsun offers multiple sizing options to accommodate common PV MC4 connector footprints and cable diameters. The PV MC4 cold shrink tube is compatible with industry-standard connector geometries and can be paired with a range of cable types while maintaining IP68 waterproof connectors performance. Volsun can also collaborate with project stakeholders to tailor material hardness, recovery ratio, and color coding for large deployments that require specific inventory management or visual identification strategies. This adaptability ensures that the core benefits — salt spray corrosion resistance and acid alkali resistant PV tubing — are delivered across diverse installation scenarios.

Economic and operational impact

Specifying Volsun’s PV MC4 cold shrink tube for new builds and retrofit projects promotes both short-term installation efficiency and long-term operational savings. Reduced labor time and elimination of hot-work permits translate into immediate cost benefits during deployment. Over the asset lifecycle, fewer moisture- and chemically induced failures lower repair costs and downtime. By addressing salt spray corrosion resistance and acid alkali resistant PV tubing requirements in a single component, Volsun simplifies BOMs and helps asset managers achieve predictable maintenance budgets and higher system availability.

The Volsun Resistant to Salt Spray Acid and Alkali Corrosion IP68 Waterproof Cold Shrink Tube for PV MC4 Connector represents a thoughtfully engineered solution for protecting photovoltaic interconnections. Combining the convenience and safety of cold shrink installation with proven salt spray corrosion resistance, acid alkali resistant PV tubing, and IP68 waterproof connectors performance, this product is optimized for the toughest environments. Whether deployed in coastal, industrial, or high-precipitation regions, the Volsun PV MC4 cold shrink tube helps ensure secure, long-lasting electrical performance for solar installations.