Merit wiper balls are primarily made of natural rubber, although some sources suggest they may also use polyurethane. Both materials share similar properties that make them ideal for the task:

• Durability: The material needs to withstand harsh conditions, including high pressure, abrasion, and exposure to drilling fluids and chemicals.
• Elasticity: The ball needs to conform to the inside of the pipe and effectively wipe away debris without damaging the pipe itself.
• Compressibility: The ball needs to squeeze through tight spots and bends in the pipe.
• Temperature resistance: The material needs to handle the varied temperatures encountered in oilfield operations.

Here’s a breakdown of the materials:

• Natural rubber: This is the most common material used by Merit, based on extensive information available online. Sources like Merit’s website, industry articles, and manufacturer directories consistently mention natural rubber as the primary material.
• Polyurethane: Some sources, albeit less frequent, mention the potential use of polyurethane. This could be because Merit might offer different versions of their wiper balls or because some distributors might specify their own materials based on specific applications.

Overall, regardless of the exact material used, Merit wiper balls are designed for efficient cleaning and debris removal in oilfield applications. Their flexibility and resilience make them a valuable tool for ensuring proper functioning of drill pipes and casings.