Explore our industrial-grade, certified anti-corrosion solutions engineered for high shear strength, mechanical resistance, and long-term durability.
A Heat Shrinkable Wraparound Sleeve (HSS) represents a pinnacle in field-joint coating (FJC) technology for transmission pipelines. Designed specifically for the pipeline infrastructure industry, these sleeves are formulated using cross-linked high-density polyethylene (HDPE) backing coated with a specialized, hot-melt copolymer adhesive. When heat is applied, the memory-effect backing shrinks to wrap tightly around the steel pipe and primary coating, while the high-shear adhesive flows to seal the interface perfectly, preventing moisture ingress and halting galvanic corrosion.
As the primary line of defense at the vulnerable welded joint areas of oil, gas, and water pipelines, HSS systems must meet extreme requirements. Standard compliance involves rigorous testing of parameters like cathodic disbondment, peel strength to steel and PE, and resistance to environmental stress cracking. Selecting a qualified China Heat Shrinkable Wraparound Sleeve Manufacturer ensures you secure field-joint coatings that maintain integrity under operational temperatures ranging from sub-zero to 80°C and above.
Founded & Innovating
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Proprietary Patents
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A State-Level High-Tech Enterprise Pioneer in Anti-Corrosion Technologies Since 2000
CYCT is an integrated developer, producer, and seller of high-performance pipeline corrosion protection materials. Our capabilities extend into buried pipeline detection services and field coating application. By focusing on R&D, production, and sales of pipeline corrosion protection materials for decades, we have established ourselves as the key supplier to top petroleum energy giants, including PetroChina, Sinopec, PipeChina, China Gas Group, and Indian Oil.
CYCT owns leading testing and R&D capabilities, backed by a highly professional R&D team and a national CNAS-accredited laboratory. This accreditation guarantees that our testing methodologies, instrument calibrations, and quality control systems meet international benchmarks. Through robust strategic cooperation with leading R&D institutes such as the CNPC Pipeline Science Research Institute, CYCT is capable of providing in-service pipelines with varied technical services, including buried pipeline detection, design schemes, cathodic protection, rehabilitation projects, and integrated security solutions.
A visual look inside our production lines, research hubs, and standard compliance laboratories.
Why global EPC contractors and state-run energy operators rely on China's comprehensive manufacturing ecosystem.
China hosts the world's most complete chemical supply chain. The high-density polyethylene resins and custom copolymer hot-melt adhesives required for heat shrinkable wraparound sleeves are sourced locally from world-class petrochemical plants, ensuring steady pricing and continuous supply.
Our facility runs state-of-the-art co-extrusion and physical/chemical radiation cross-linking lines. This allows us to scale production up to thousands of square meters daily to meet the aggressive timelines of massive pipeline expansion projects.
With seamless access to major maritime ports, railway networks connecting China to Central Asia and Europe, and global air freight options, CYCT ensures that pipeline coatings arrive at your project site securely, on time, and custom-packaged.
Tailored configurations to meet distinct topological, environmental, and geological challenges.
For pipeline trenchless crossings under rivers or highways, the coating experiences extreme shear and frictional stress. We provide specialized fiberglass reinforced heat shrink sleeves that withstand high abrasiveness during pull-back operations.
In regions with clay-heavy soils that expand and contract with moisture shifts, standard mastic systems might yield. Our high-shear hot-melt copolymer adhesives resist soil-stress induced shifting, retaining tight bonds to the pipe surface.
Flowlines transporting pre-heated crude oil require constant anti-corrosion protection. CYCT engineers PP field joint sleeves capable of operating continuously up to 110°C, maintaining molecular stability without degradation.
Ensuring cross-border compliance, certification validation, and field-readiness.
Different markets mandate specific engineering norms. European markets require compliance with EN 12068 class C80 standards, North American projects refer to AWWA C214/C216 and ISO 21809-3, while operators in the Middle East and Russia rely on their localized national criteria.
CYCT bridges this gap by offering customized testing through our national CNAS laboratory. We produce and test wraparound sleeves under strict international testing requirements:
CYCT is recognized across major industry guilds, guaranteeing the authenticity and dependability of our products.
We are proud members of the Council in the Chinese Society for Corrosion and Protection (CSCP), hold the Qualification Certificate of Corrosion Protection Construction, the Qualification Certificate of Pipeline Detection, and we are recognized as a corporate member of the China Association of Petroleum Engineering Construction (CAPEC).
Innovating ahead of the curve: Next-generation corrosion mitigation paradigms.
Global regulatory bodies are limiting VOC emissions and solvent-based chemicals. CYCT is spearheading solvent-free hot melt adhesives and photo-curing materials that cure instantly under UV/Sunlight without off-gas release.
Micro-capsule technology embedded within the backing or viscoelastic layer triggers localized monomer release if the backing is punctured, sealing minor structural gaps autonomously before moisture triggers oxidation.
Deep geothermal exploration and high-viscosity steam injection lines require coatings that function at temperatures above 130°C. CYCT is actively developing advanced PP hybrid materials to withstand these environments.
Get professional, engineering-focused answers regarding selection, installation, and performance criteria.
Mastic-based sleeves feature a thick, butyl-rubber based sealant. They are generally self-healing and suitable for pipelines with lower operating temperatures (under 50°C). Hot-melt copolymer sleeves utilize a crystalline adhesive that cures into a rigid, highly shear-resistant bond, designed for high-stress soils and high-temperature pipelines (up to 80°C or higher).
Radiation cross-linking changes the molecular structure of high-density polyethylene from linear chains to a three-dimensional network. This cross-linking process imparts a "memory effect" to the backing, allowing it to shrink rapidly when heated, while significantly improving thermal stability, tensile strength, and impact resistance.
Cathodic shielding occurs when a coating detaches from the pipe but prevents cathodic protection currents from reaching the steel. Utilizing viscoelastic backings or premium hot-melt copolymer adhesives that maintain superior, long-term adhesion limits moisture intrusion and ensures compatibility with CP systems.
For optimal performance, the steel surface at the weld joint should be blast-cleaned to Sa 2.5 grade, or wire-brushed to St 3 minimum. The adjacent factory coating should be beveled and abraded. Pre-heating the steel to the adhesive's activation temperature (typically 60°C - 70°C for mastic, or higher for hot melt) is vital before wrapping the sleeve.
Yes. Because we control the formulation of the backing and the hot-melt copolymer at our own facility, we can customize backing thickness (typically 1.0mm to 1.5mm), adhesive thickness (typically 1.0mm to 2.0mm), width (up to 900mm), and formulate adhesive classes to meet specific operational temperatures.
High-quality secondary coating solutions, specialized repair patches, and weather-resistant wraps for complex pipeline environments.
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