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Customized Services

We have a professional technical R&D team that can provide customized product design, solutions，size, packaging, logo and performance adjustment according to customer needs.

Sales Service

We have a professional sales team to provide you with efficient and high-quality services throughout the whole sales process.
 

FAQ

  • What's the main business of Volsun?

    Our company focuses on the research and development, production and sales of new polymer materials, 
    providing customers with solutions and high-quality material products. 
    Our products are widely used in electronics, automobiles, construction, medical and other industries, 
    providing waterproof sealing and fireproof solutions.

  • What is Volsun's competitive advantage?

    ①Technical advantages: We have a professional R&D team with rich technical experience and innovation capabilities, 
    able to provide customized solutions for customers.
    ②Quality Assurance: We strictly control product quality, using advanced production equipment and strict quality inspection processes 
    to ensure that products meet international standards and customer requirements.
    ③Supply chain advantages: We have established partnerships with many high-quality suppliers 
    to ensure a stable supply of raw materials and competitive prices.
    ④Customer service: We focus on communication and cooperation with customers and provide a full range of customer services, 
    including technical support, after-sales service, etc.

  • What are the features of your product?

    ①High performance: We focus on the performance advantages of our products and pursue characteristics such as 
    high strength, high wear resistance, and high resistance to chemical corrosion to meet customer needs.
    ②Diversity: We offer a wide range of products in different types and specifications to meet the needs of different industries and applications.
    ③Customizable: We can provide customized product solutions according to customers' specific requirements, including material formula, color, size, etc.
    ④Environmental friendly: We are committed to developing and producing environmentally friendly and sustainable products 
    that comply with relevant environmental regulations and standards.

  • Have your products passed relevant certifications?

    Yes, our products comply with international and industry standards and have passed relevant certifications and testing. 
    We ensure product quality and performance meet customer expectations and comply with local and international regulatory requirements.

  • Professional Guide to EPDM Cold Shrink Tubes

    Q1: What is a Cold Shrink Tube, and how does it differ from Heat Shrink?

    A: A cold shrink tube is an open-ended, tubular rubber sleeve that is factory-expanded onto a removable plastic support core. Unlike heat shrink, which requires a torch or heat gun, cold shrink installs by simply pulling out the support core, allowing the tube to contract naturally due to its "elastic memory". This eliminates fire hazards and ensures a constant radial pressure seal that adapts to the cable's thermal expansion and contraction.

    Q2: EPDM vs. Silicone Cold Shrink: Which material should I choose?

    A: Selection depends on your environment:
    • EPDM is the "outdoor specialist," offering superior resistance to punctures, UV rays, and acids at a better price point, making it ideal for 5G base stations and PV plants.
    • Silicone Rubber is the "performance insurance" choice, featuring an ultra-wide temperature range (-60°C to 200°C) and higher flexibility for extreme heat or high-vibration machinery.
     

    Q3: Why is EPDM the preferred solution for 1kV cable sealing?

    A: For low-voltage applications (1kV and below), the main threat is moisture ingress and seal degradation. EPDM provides a high dielectric strength (≥15kV/mm) and maintains a tight, waterproof seal in underground and wet environments. Its robust physical properties effectively reduce failure risks caused by aging or gaps in the seal.

    Q4: How do I calculate the correct size for a cold shrink tube?

    A: Successful selection follows the "2/3 Rule":
    1. Expansion Diameter: The expanded inner diameter of the support tube should be large enough so that 2/3 of its capacity exceeds the maximum diameter of the cable joint.
    2. Recovery Diameter: The fully shrunk inner diameter must be smaller than the minimum outer diameter of the cable to ensure a tight, gap-free fit.
     

    Q5: How much length should I allow for proper sealing?

    A: To ensure an unbroken seal, the tube must fully cover the joint and overlap the cable sheath by 20–50mm on both sides. Since the tube may shorten slightly during contraction, it is recommended to add a 5%–10% length margin during selection.

    Q6: Can EPDM Cold Shrink Tubes be used for underground burial?

    A: Yes. EPDM is highly suitable for underground laying because it offers excellent resistance to moisture, salt spray, and chemical corrosion. Its high tear strength (≥25kN/m) protects the cable from mechanical damage during soil shifting or backfilling.

    Q7: Will the cold shrink tube lose its grip or loosen over time?

    A: No. High-quality EPDM possesses a stable molecular structure and excellent "elastic memory". Unlike tape or heat shrink that may become brittle, cold shrink maintains active radial pressure throughout its lifespan, even under dynamic conditions like swinging overhead cables.

    Q8: Are these products environmentally safe and compliant?

    A: Professional-grade EPDM cold shrink tubes comply with the EU RoHS directive. This ensures they are free from harmful substances, making them safe for use in sensitive communication base stations and power infrastructure.
     

    Q9: What is the typical service life of an EPDM cold shrink seal?

    A: EPDM is designed for long-term reliability. Its exceptional weather and UV resistance ensure a service life that often matches the lifespan of the cable itself, even in harsh outdoor environments.

    Q10: What are the key technical performance indicators for EPDM?

    A: High-performance EPDM cold shrink tubes, such as those from VOLSUN, typically feature:
    • Tensile Strength: ≥8.6 MPa.
    • Elongation at Break: ≥600%.
    • Dielectric Strength: ≥15kV/mm.
    • Operating Temperature: -40°C to 90°C.

  • How to ensure the quality of thermal pads?

    We adopt a strict quality control system, and everything from raw materials to finished products is strictly tested to ensure that the product quality meets the standards.

  • Do you accept customization?

    Yes, we accept customization. You can customize the color, size, pre-cut shape, and whether it has adhesive backing according to your needs.

  • What are the thickness and hardness options of thermal pads?

    The thickness range is 0.5mm-5mm, and the hardness (Shore 00) is between 30-70, which can be selected according to needs.

  • What is the insulation performance of silicone thermal pads?

    Our thermal pads have excellent insulation performance and the resistivity is greater than 10¹²Ω·cm.

  • What is the range of thermal conductivity of thermal pads

    The common thermal conductivity range of our thermal pads is 1-8W/(m·K), and products with higher thermal conductivity are under development.

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China's pioneer manufacturer of cold shrink tube,fiberglass sleeve, heat shrink tube,identification sleeve---Volsun

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