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According to RMA IP-3-4 (1997), the shelf life is 8 years under proper storage conditions.

2.36 kW

T = Effective Force (Nt or N)
V = Belt Speed (m/ sec)
D = Pulley Diameter (m)
N = Pulley Speed (rpm)

Grade H (Heavy Cutting and Impact Application): This cover rubber has the characteristics of reducing the severe wear caused by the conveying material when conveying sharp and abrasive objects. For example, metal ore (mining), limestone (mining), granite (mining), quartz, blast furnace clinker, slag, crushed metal ore, sandstone (mining), stone chips, slate, coke (cold), crushed Glass and grit.

Grade D (Heavy Wear Application): This cover rubber, by experience, is suitable for conveying large abrasive materials as defined under various conditions.

Grade L (General Application): This cover rubber is suitable for conveying moderately abrasive materials such as lumps, sand (sharp), superphosphates (clumps or powders), bone, coal (open-air), ash (ashes), quicklime, cement (furnace); mildly abrasive (transport), non-abrasive and dry (material), e.g. sand (smooth), cement (floor), clay (clay), slaked lime, charcoal, Cereals (grain), vegetables, fruits, flour, dry flour (inert), wood chips and pulp (dry).

1. The return roller(s) is dirty, sticky or not straight.
2. The grade of cover rubber is too low.
3. The stowage of conveying material is improper or problematic.
4. The belt is sagging between the carried rollers.

Belt coiled diameter × number of rounds × 3.14 (add and subtract unmeasured or excess parts after calculation).

The surface of rubber products is easy to stick to light impurities such as dust and hair, and its stiffness and elasticity are very good. Not easily deformed by external force. Counterfeit silicone products are the exact opposite. It is easy to deform and feels rough, because there is no grease-like substance on the surface of the fake silicone.

Rubber aging refers to the phenomenon that rubber and its products are affected by internal and external factors during processing, storage and use, resulting in changes in performance structure and gradual deterioration of physical, chemical and mechanical properties, and loss of use value. Symptoms such as: cracking, stickiness, hardening, softening, chalking, discoloration, mildew and so on.

Ozone, heat, light, mechanical stress, moisture, and other factors include chemical media, variable valence metal ions, high-energy radiation, electricity, biology, and so on.

There are artificial accelerated aging test methods and natural aging test methods. The artificial accelerated aging tests are ozone aging, photoaging, photo-ozone aging, thermal aging, artificial climate aging, biological aging, high-energy radiation aging, electrical aging and chemical aging, etc. The natural aging test includes atmospheric accelerated aging test, natural storage aging test, natural medium test (such as buried ground, etc.) and biological aging test.

According to JIS K6323 / CNS 745, the bending fatigue test is carried out by placing the V-belt on the test device with the specified pulley, rotation speed, and load, and then performing an accelerated test. Its requirements are listed in the table below.

Table 3: Bending fatigue times and variation rate of pulley center distance

Performance
Items
Bending Fatigue
Bending Fatigue Times

Variation rate of pulley center distance after 24 hours.

Table B2 Bending fatigue test conditions

Types of V-belts
Speed range of drive pulley
Force (F) N
Reference length of V-belt for testing

According to ISO 4184 / CNS 745, the allowable tolerance range of the V-belt length is shown in the table below:

Yes, we do.