When a conveyor belt is damaged, a chute loses wall thickness due to abrasion, or a pulley requires restoration, the question is not whether the equipment can be repaired, but how long it will remain out of service.

In mining, every hour of downtime affects production, maintenance planning, and critical asset availability. Therefore, the cure time of a lining or repair system directly influences operational continuity.

However, cure time does not depend solely on the product used. Environmental conditions and application variables can significantly shorten or extend curing and return-to-service times.

Understanding these factors enables better repair planning and maximizes the performance of solutions such as FLEXSOL® and DURAFAST®, which were developed to meet the demands of industrial maintenance in mining.

What Is Cure Time and Why Is It So Important?

Cure time is the period required for a material to reach a specified degree of cure. Return-to-service time is the point at which the repaired equipment can safely resume operation under defined conditions. Depending on the product and service requirements, this may occur before full cure.

During curing, the material develops the properties specified for the selected application.

In a mining operation, the difference between waiting one hour and waiting several additional hours before returning equipment to service can significantly affect production continuity.

Therefore, the objective is not merely to achieve a fast cure, but a reliable cure that allows the equipment to be returned to service safely.

Return-to-service time depends on the selected product, application temperature, material thickness, and accelerator dosage where applicable. Published cure times should therefore be interpreted under the conditions specified in the corresponding technical documentation.

Environmental Conditions: Temperature and Humidity

Temperature directly influences the rate of the chemical reactions responsible for curing. As temperature decreases, these reactions tend to slow down, increasing the time required for the material to reach its specified operating properties.

This challenge is particularly common in mining operations located at high altitude or exposed to low temperatures and significant variations between daytime and nighttime conditions.

Relative humidity should be evaluated together with substrate temperature and dew point. Condensation or residual moisture on the substrate can compromise adhesion, even when the ambient temperature is within the recommended range.

Application Variables: Mixing, Thickness, and Accelerator Dosage

Cure performance also depends on maintaining the specified mixing ratio, thoroughly mixing the components, applying the recommended thickness, and observing the product’s pot life.

For DURAFAST®, accelerator dosage and temperature must be considered together when determining cure and return-to-service times.

Surface Preparation Remains Critical

Even when a high-performance product is used, inadequate surface preparation can significantly affect the final result.

Dust, grease, residual moisture, rust, corrosion products, and other contaminants can reduce adhesion and increase the risk of premature failure. Cleaning, mechanical roughening, and primer application must follow the procedure specified for the substrate and selected product.

How These Factors Apply to an Actual Repair

During an emergency repair on a mining conveyor belt, the objective was to restore operational continuity after approximately 17 meters of lateral damage was identified.

The repair included mechanical surface preparation, cleaning, primer application, and verification of the application conditions before the selected cold-applied polyurethane repair system was applied.

The repair work was completed in 4 hours and 20 minutes, and the repaired belt was ready to return to service approximately one hour after application.

A conventional repair was estimated to require approximately 48 hours of downtime to replace and vulcanize the damaged section. Compared with this alternative, the selected repair solution helped avoid an estimated US$10–13 million in production losses.

When a repair can be completed within a short maintenance window, the benefit extends well beyond the maintenance function.

Downtime is reduced, critical asset availability is restored, the risks associated with extended repair work are lowered, and operational continuity is supported.

Therefore, when evaluating a mining equipment repair solution, it is important to consider not only the material’s final properties, but also the application conditions required to reach the specified return-to-service condition.

In mining, a successful repair is not measured solely by the final condition of the repaired surface. It is measured by how quickly the equipment can safely return to operation and whether the repair delivers the required performance under actual operating conditions.

For more information about our repair and wear-protection solutions or technical advice for your operation, please complete the form by clicking the “Contact Us” button. You can also email us at:

• Chile: contacto@bertech.cl
• Brazil: comercialbrasil@bertech.cl
• Other countries: internationalsales@bertech.cl

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