What is one of the main benefits of using an abrasive like silicon carbide in sanding?

Using silicon carbide as an abrasive in sanding is primarily advantageous due to its high durability. Silicon carbide is a hard material that retains its sharpness over extended use, allowing for effective material removal on a variety of surfaces. This durability means that it doesn't wear down quickly, making it cost-effective in the long run despite its initial price. Additionally, because it can maintain its performance over time, it is particularly suited for sanding harder materials such as metal and glass, enabling precise finishing without excessive material degradation or loss of effectiveness.

The other options, while they might have their respective advantages in different contexts, do not fully encapsulate the primary benefit of silicon carbide in this scenario. Low cost may not necessarily apply, as silicon carbide can be more expensive compared to other abrasives. Non-toxicity is not a characteristic typically emphasized for silicon carbide, as safety data and handling practices are still important considerations. Water repellency is relevant in some applications but is not a defining benefit of using silicon carbide compared to other abrasives specifically designed for that purpose.