When a high-voltage cable joint is exposed to moisture, thermal cycling and mechanical stress, the sealant is not a minor accessory. It is part of the insulation and protection system. Hunan Shangyu Waterproof Material Co., Ltd. manufactures a two-component A/B cable joint sealant developed for this exact duty. The SY series is supplied as Part A and Part B in clearly labeled pails, mixed on site and poured into the cable joint protection shell, where it cures at normal temperature into a rubber-like elastic body.
A Two-Part System Built for Field Reliability
Our high-voltage cable joint sealant is a two-component product. Part A is a buff, sticky thick liquid; Part B is a black, sticky thick liquid. The two parts are mixed thoroughly in the specified ratio, shown in the product datasheet as a 2:1 B:A mix, and poured into the cable protection shell. At normal ambient temperature, the mixture cures into a rubber-like high-molecular elastic body that helps seal the cable insulation and protect the joint against water ingress. Because the system is cold-applied, it avoids hot pouring and open-flame work at the joint. This supports safer, more convenient handling for field crews and helps reduce the safety burden associated with traditional hot-applied compounds.
Key Performance Characteristics
Cold application at normal temperature. The sealant is designed for operation in normal temperature conditions, supporting safe and convenient installation. Contractors can mix and pour on site without heating the compound, which is useful in field joints, repair work and cable accessory assembly.
Elastic, strong and durable. The cured material is formulated for easy stretch, high strength, and resistance to cold, heat and aging. This combination helps the sealant absorb movement and thermal cycling while maintaining a flexible barrier around the joint.
Moisture-blocking encapsulation. The product datasheet lists impermeability at 0.3 MPa for 30 minutes with no water penetration, alongside a breakdown voltage of at least 20 kV/mm for the grade shown. These characteristics support the use of the sealant in high-voltage cable joint and accessory applications where moisture protection is critical.
Practical mechanical profile. The technical sheet shows hardness of 50 plus or minus 10 Shore A, elongation of at least 200 percent, tensile strength of at least 1.20 MPa, and a tack-free time of 180 minutes or less for the standard grade. These values give buyers a useful starting point when comparing the product with their joint design and installation requirements.
Export-friendly handling. The product is described as non-dangerous, stable, non-flammable and non-explosive, and it can be transported as normal goods. Pails should be protected from sun and rain and stored in a cool, well-ventilated warehouse. After opening, Part A should be resealed to prevent moisture curing and waste. The product photos show the sealant packed in branded green-and-white pails with clear part identification, as well as stacked pails in storage.
Where the Sealant Fits
This A/B cable joint compound is intended for high-voltage cable joints, cable accessories and joint protection shells. It can be used in new cable installations, joint assembly and maintenance or repair work where a pourable, cold-applied seal is required. Cable accessory manufacturers can use it as a component in joint kits; utilities and EPC contractors can use it for field assembly; distributors can stock it as a focused category item with repeat demand in power networks. The product is relevant for underground cable systems, substation connections and other insulated cable joints where a flexible, water-blocking encapsulation is needed.
Manufacturing Background and Quality Approach
Hunan Shangyu Waterproof Material Co., Ltd. was established in Liling, Hunan, in October 2018 after relocating from Shanghai. The company specializes in the research, production and sales of high-voltage cable joint sealing compounds. Its team draws on years of experience in high-voltage cable joint sealing materials and has studied design concepts from well-known Japanese, US and German brands. This practical and international perspective helps the company adapt formulations to different regional climates and customer requirements.
The company reports cooperation with dozens of listed companies in the cable accessory and power equipment sector, and its products have been exported to the United States, India, Ukraine, Saudi Arabia and African countries. The company follows a quality-oriented policy: quality for survival, efficiency for development. Product literature provides technical data for the SY series, and the packaging shown in the photos carries clear product and part identification. Buyers can request current product documentation for their evaluation and joint-design review.
Industry Insight: Why Joint Sealing Matters
As power networks age and new connections are added, cable accessories must perform in humid, hot, cold, coastal and industrial environments. Moisture ingress can degrade insulation, and repeated load cycling can open micro-gaps around a joint. A pourable two-part sealant fills complex geometries and cures in place, creating a flexible barrier that moves with the cable rather than cracking under stress. Buyers should verify mix ratio, working time, cure behavior and compatibility with the joint body and cable insulation. Open communication between the sealant supplier and the cable accessory designer is the best way to reduce installation risk and improve long-term joint reliability.
Working With Hunan Shangyu
We welcome inquiries from international distributors, cable accessory manufacturers, utilities and project contractors. Please share your joint type, cable accessory design, application climate, installation method and expected packaging requirements. Our team can discuss the suitable product grade, mixing and pouring procedure, storage conditions and supply details. With a focus on quality, practical field performance and export-ready packing, Hunan Shangyu is ready to support your next high-voltage cable joint project.
Contact
Company: Hunan Shangyu Waterproof Material Co., Ltd.
Address: Beside Guoci Road, Liling Economic Development Zone, Hunan
Postal code: 412200
Phone: 13386069160
Landline: 073122971118
Fax: 073122971118
Email: 249150783@qq.com
Website: http://www.shangyu-waterproof.com/
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