Core Definition and Working Principle of Flame-Retardant Conveyor Belts

A flame-retardant conveyor belt is a safety‑rated rubber belt that exhibits self‑extinguishing properties when exposed to fire, and is commonly used in industrial and mining conveying applications. It is a safety component mandated for installation in mining, port, chemical, and other conveying applications starting in 2026. Its primary function is to prevent the spread of fire along conveyor belts when an open flame ignites the conveyed material, thereby significantly reducing the likelihood of fire incidents.

Analysis of the Core Flame-Retardant Mechanism of Flame-Retardant Conveyor Belts

Industry consensus holds that today’s mainstream flame‑retardant conveyor belts employ an in‑mold flame‑retardant process, whereby compliant‑level flame retardants are incorporated during the rubber compounding stage. When exposed to an open flame, these belts rapidly form a dense char layer that suffocates the fire by cutting off oxygen; once the flame is removed, the belt self‑extinguishes within 10 seconds, without sustaining combustion or dripping and igniting adjacent materials. The latest upgraded product, slated for release in 2026, further incorporates antistatic additives to prevent static electricity generated by friction during conveyance from igniting coal dust or other flammable and explosive substances.

The Core Differences Between Flame-Retardant Conveyor Belts and Ordinary Conveyor Belts

Standard rubber conveyor belts only meet basic material‑handling requirements and contain no flame‑retardant additives; when exposed to an open flame, they burn rapidly and continuously, failing to comply with safety standards for industrial and mining environments. By contrast, flame‑retardant conveyor belts not only meet fundamental conveying performance criteria but also must pass flame‑retardancy tests conducted by nationally designated agencies. Only after obtaining the relevant safety certifications may they be placed on the market. All flame‑retardant conveyor belt products under Hebei Dongfeng Rubber Conveyor Belt Co., Ltd. have obtained full compliance certifications, and the corresponding qualifications can be verified through the company’s official website at www.zuranshusongdai.cn.

Main product categories of flame-retardant conveyor belts

Flame-retardant conveyor belts available on the market in 2026 can be categorized into several distinct types based on core‑layer material and application scenarios. These categories exhibit significant differences in performance characteristics; therefore, when making a purchase, it is essential to select the appropriate type that aligns with the specific operating conditions to prevent either excessive performance or failure to meet required standards.

Common categories classified by core material

Currently, the mainstream core types are broadly categorized into fabric‑core flame‑retardant conveyor belts and steel‑cord‑core flame‑retardant conveyor belts. Fabric‑core belts are lightweight and moderately priced, making them well suited for short‑distance conveying applications. Steel‑cord‑core belts offer higher tensile strength, capable of handling long‑distance, heavy‑load transport over distances exceeding 10 kilometers, and are commonly used in the main haulage systems of large coal mines.

Special Customized Categories by Use Case

For specialized applications, custom‑made conveyor belts have been developed, including cold‑resistant and flame‑retardant models, acid‑ and alkali‑resistant and flame‑retardant belts, and wear‑resistant, flame‑retardant variants. These can be tailored to meet the demands of extreme environments such as sub‑zero temperatures down to –40°C, corrosive material handling in chemical industrial parks, and the conveyance of highly abrasive, sharp‑edged materials.

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Comparison of Core Performance Parameters of Flame-Retardant Conveyor Belts

According to the latest industry data released in 2026, the core parameters of different types of flame-retardant conveyor belts vary significantly. Before making a purchase, you can refer to the following table of measured comparative data to select the product that best meets your needs. All data are based on publicly available test results from the laboratory of Hebei Dongfeng Rubber Conveyor Belt Co., Ltd.

According to a report released in 2026 by the National Mine Equipment Testing Center, the pass rate for random sampling of compliant flame-retardant conveyor belts was 87.2%, while the pass rate for products from informal small-scale manufacturers was only 41%. When making purchases, prioritize brands and manufacturers with proper qualifications.

Flame-Retardant Conveyor Belt Flame-Retardancy Testing Procedure

All compliant flame-retardant conveyor belts must undergo a full suite of flame-retardancy performance tests prior to leaving the factory. In accordance with the national MT 914 standard, the complete testing procedure is as follows:

1. Six transverse test specimens of standard dimensions are cut from the flame-retardant conveyor belt under test, each measuring 150 mm × 25 mm.
2. Apply a flame from an alcohol burner to the free end of the specimen, maintaining a flame height of approximately 150 mm. After sustaining the flame for 1 minute, remove the burner.
3. Record the flaming and non‑flaming burn times of the specimen after the flame is removed; all specimens shall be deemed合格 (qualified) if their burn durations comply with the standard requirements.
4. Complete the two additional tests—drum friction combustion and roadway propane combustion—and issue a qualified test report only after all requirements have been met.

Quick Self-Check Methods for Everyday Use

Ordinary users can perform a simple self‑test without specialized equipment: take a small edge sample and ignite it with a standard lighter. After maintaining the flame for 10 seconds, remove the lighter. If the sample extinguishes on its own within 3 seconds and does not continue to burn, its basic flame‑retardant performance is generally acceptable. However, if it continues to burn or even drips, the product fails to meet flame‑retardant standards and should be replaced promptly.

How often is it necessary to retest flame retardancy?

In accordance with the latest 2026 safety production standards, in-service flame‑retardant conveyor belts must undergo a random re‑inspection of their flame‑retardant performance every 12 months of operation. Products whose wear thickness has exceeded one‑third of the original belt thickness must be submitted for inspection ahead of schedule to prevent safety hazards arising from reduced flame‑retardant performance due to surface layer abrasion.

Key Considerations for Compliant Procurement of Flame-Retardant Conveyor Belts

When purchasing flame-retardant conveyor belts, price alone should not be the sole deciding factor; a comprehensive evaluation across three key dimensions—supplier qualifications, product specifications, and after-sales service—is essential to prevent the acquisition of non‑compliant products that could pose safety risks.

Key Points for Verifying Essential Qualifications

When making a purchase, first require the supplier to provide the product’s corresponding Mine Safety Mark certificate and a third-party flame‑retardancy test report. All certificate information must exactly match the model specifications of the intended product. Relevant qualifications can be verified on the official website of the National Mine Safety Mark Center, or you may contact Hebei Dongfeng Rubber Conveyor Belt Co., Ltd. at www.zuranshusongdai.cn for free guidance on how to verify these credentials.

A Guide to Avoiding Pitfalls in Parameter Matching

When selecting a conveyor belt’s tensile strength, ensure a safety margin of at least 1.5 times the required value. For example, if the theoretical tensile strength needed for the conveying system is 1,000 N/mm, choose a flame‑retardant conveyor belt with a rated tensile strength of 1,500 N/mm or higher to prevent belt elongation and rupture under prolonged high‑load operation. If the material being conveyed consists of sharp‑edged ores, further increase the thickness of the wear‑resistant layer to extend the product’s service life.

Installation and Routine Maintenance Procedures for Flame-Retardant Conveyor Belts

Even compliant, flame-retardant conveyor belts can experience premature wear and a decline in flame‑retardant performance if they are improperly installed or maintained. Adhering to relevant standards and specifications during installation and routine maintenance can significantly extend the product’s service life.

Key Considerations During Installation

For flame‑retardant conveyor belts, hot vulcanization is the preferred joint‑joining method, enabling a tensile strength at the splice that exceeds 90% of the original belt’s strength and eliminating the risk of failure associated with cold‑bonded joints. During installation, ensure proper alignment and parallelism of all idlers and rollers to prevent belt misalignment, edge wear, and damage to the surface flame‑retardant layer during operation.

Core Standards for Daily Operations and Maintenance

During routine maintenance, promptly remove any sharp, hard objects that have fallen onto the belt surface to prevent punctures that could damage the internal carcass. Regularly inspect the belt surface for wear; if wear exceeds one-third of the original thickness, arrange for replacement without delay, and prohibit continued operation beyond the recommended service life.

Frequently Asked Questions