When buying raw material belts, there are several factors to pay attention to. Firstly, consider the material of the belt. It should be made from high-quality raw materials that are durable and long-lasting. Pay attention to the strength of the material to ensure it can withstand the intended usage.

Secondly, consider the width and length of the belt. It should be suitable for the specific application or machinery it will be used for. Ensure that the belt is neither too wide nor too narrow for proper functionality.

Next, consider the belt's flexibility and elasticity. It should be able to bend and stretch without losing its shape or strength. This is especially important in applications where the belt needs to withstand frequent movement or stretching.

Additionally, check for any specific features or properties that may be required for the intended use. For example, if the belt will be used in a food processing industry, it should be food-grade and safe for use with edible products.

Lastly, compare prices from different suppliers to ensure you are getting the best value for your money. Consider the reputation and reliability of the supplier as well to ensure you are purchasing from a trustworthy source.