Explore our premium grade endless rubber conveyor belts and essential industrial system supporting components.
In heavy industrial material transport, system reliability is the single most important factor for operational uptime. Traditional conveyor belts rely heavily on mechanical fasteners or on-site manual cold chemical splicing. These joints represent mechanical vulnerabilities, accounting for nearly 80% of all unexpected belt failures. Under severe tension, continuous flexing, and dynamic load stress, mechanical splices pull apart, and cold-bonded joints degrade due to environmental factors.
Endless Rubber Conveyor Belts solve this vulnerability. They are constructed without any spliced joints. During the factory manufacturing process, the carcass fabric (EP, NN, or Steel Cord) and the protective cover rubber compounds are joined in a continuous loop and cured together under high temperature and hydraulic pressure in a vulcanizing press. The result is a seamless structure with uniform strength, flexibility, and thickness across the entire circumference. This uniform construction prevents localized strain, ensures balanced distribution of driving forces, and significantly extends the operational lifespan of the conveying system.
Established in 2004, Hebei Boao Rubber Technology Co., Ltd. (operating under the signature brand name "Jinao") has become a global leader in high-end rubber conveyor belts. Located within the Boye County Rubber Industrial Park in Baoding City, Hebei Province, our state-of-the-art facility covers over 30 acres of dedicated production space.
For more than two decades, Hebei Boao has combined polymer material science, custom engineering, and advanced manufacturing. We maintain control over every step of production. Our facility features independent chemical analysis labs and advanced physical properties testing centers. This setup ensures that all materials—from raw polymer compounds to finished products—undergo strict quality inspections. Our adherence to international quality management system certifications guarantees that only top-tier products leave our facility.
Designing a conveyor system that can withstand harsh environments requires deep expertise in elastomeric compounds. Depending on the density, weight, velocity, and temperature of the transported material, we custom-develop specific elastomer profiles using SBR, NBR, EPDM, and natural rubber formulations.
| Compound Category | Standard Grades (DIN / ISO) | Operating Temperature Range | Primary Performance Attributes |
|---|---|---|---|
| Heat Resistant (HR / UHR) | DIN T1, T2, T3 (ISO 4192) | -15°C to +200°C (Peaks up to 250°C) | EPDM/SBR blend prevents thermodynamic cracking and rapid oxidation. |
| Flame Retardant (FR) | ISO 340, MSHA, EN 12882 | -25°C to +80°C | Self-extinguishing compound designed for underground mining and grain handling safety. |
| Cold Resistant (CR) | DIN 22102 (Cold Resistant) | -50°C to +50°C | Retains flexible elasticity without embrittlement in arctic conditions. |
| Abrasion Resistant | DIN X, Y, W (ISO 10247) | -30°C to +70°C | High wear resistance (abrasion loss < 90 mm³ for W grade). Ideal for sharp aggregates. |
| Acid & Alkali Resistant | Specialized Copolymer Compounds | -10°C to +60°C | Resistant to swelling and degradation from corrosive chemicals. |
Unlike standard open-end conveyor belts that require mechanical clipping or manual vulcanizing during installation, our factory-manufactured Endless Rubber Conveyor Belts are vulcanized into a continuous loop under controlled high-pressure conditions. This ensures that the carcass plies maintain uniform tensile stress throughout the entire loop, preventing uneven load distribution and premature belt failure.
Across the globe, industrial material handling systems operate under varied environmental challenges. The "Jinao" brand endless belts are engineered to perform reliably in these specific environments:
As a leading Chinese manufacturer, Hebei Boao Rubber Technology offers a strong combination of supply chain resilience, advanced production equipment, and cost-efficiency. Our location in the Boye County industrial cluster provides us with direct access to high-quality raw synthetic elastomers, advanced carbon black suppliers, and steel cord reinforcement manufacturers. This proximity reduces raw material transport times and keeps production costs competitive.
We operate advanced calendering, forming, and vulcanizing lines. Our continuous-loop vulcanization presses are capable of producing endless belts to exact dimensional tolerances. Our vertical integration ensures that every batch of compound is mixed, processed, and cured under strict quality controls, offering reliable lead times and high product quality for large global projects.
Our quality control program is supported by our independent testing facility. Every production run is tested to ensure it meets our performance standards before shipment:
At Hebei Boao, we provide end-to-end technical support that goes beyond shipping the product. We help clients optimize their conveying systems to extend belt service life and minimize operating costs. Our technical services include:
We manufacture endless belts to precise length specifications. This ensures correct tensioning alignment and prevents belt slippage during installation.
We provide chemical aging analysis and cover wear measurements to help operations schedule planned replacements during scheduled maintenance shutdowns.
Our products are manufactured to meet API 6D, API 607, CE, ISO 9001, ISO 14001, and ISO 45001 standards, ensuring compliance with local import and environmental regulations.
Our conveyor belts are field-tested in demanding industrial operations. The "Jinao" brand is trusted by leading domestic and international enterprises:
A visual insight into our raw material testing, calendering line, and product assurance laboratories.
Fabric Belt Line
Steel Cord Equipment
Proportioning System
Calendering & Shaping
Carcass Adhesion Test
Pull-out Test Machine
Dynamic Fatigue Tester
DIN Abrasion Tester
Detailed answers to technical questions about endless conveyor belt selection, maintenance, and operation.
An endless rubber conveyor belt is a pre-joined conveyor belt manufactured into a continuous loop without mechanical fasteners or external splices. The carcass reinforcement (polyester, nylon fabric, or steel cords) and the cover rubber are cured under heat and pressure in a vulcanizing press at the factory. This design eliminates weak joints and provides uniform strength and thickness throughout the entire length.
Factory-vulcanized joints are cured under controlled temperature, clean air conditions, and high hydraulic pressure. This process produces joint strength close to 100% of the belt's rated tensile strength. On-site splicing (cold bonding or manual vulcanization) is subject to environmental variables like humidity, dust, and temperature fluctuations, which can reduce splice strength to 60-80% of the original belt rating.
EPDM (Ethylene Propylene Diene Monomer) provides chemical stability at high temperatures. Unlike standard SBR compounds, which oxidize, harden, and crack when exposed to continuous heat, EPDM retains its flexibility. This helps prevent cover separation and cracking, even when transporting materials like hot cement clinker or sinter at temperatures up to 200°C.
Endless belts must be ordered to precise length specifications because they cannot be shortened easily. The length should be measured along the belt line with the tensioning system set to its minimum position (take-up pulley moved forward). This provides the necessary clearance for installation while allowing full use of the tensioner's travel stroke to maintain proper belt tension over time.
For high-volume mining operations handling sharp ores or limestone, DIN-X or DIN-W compounds are recommended. DIN-X provides balanced tensile strength and high cutting/tearing resistance for large lump materials. DIN-W is formulated for high wear resistance, with less than 90 mm³ of volume loss, making it suitable for transporting fine, abrasive materials like quartz sand or mineral concentrates.
Premium grade structural components, bracket assemblies, and heavy-duty steel wire reinforced belts.
Boao Rubber