The common types of defects in product liability cases include design defects, manufacturing defects, and failure to warn defects.

Design defects: A design defect is a flaw in the design of the product that makes it unreasonably dangerous, even when it is manufactured correctly. Design defects are inherent in the product and can affect all units produced according to that design. For example, a ladder designed with a weak material that fails to support the user's weight.

Manufacturing defects: A manufacturing defect occurs when a product is made improperly, resulting in a dangerous product that is different from other products of the same type. Unlike design defects, manufacturing defects typically affect only a small portion of the products produced. For example, a batch of medications contaminated with a toxic substance due to an error during the manufacturing process.

Failure to warn defects: A failure to warn defect occurs when a manufacturer fails to provide adequate warnings or instructions about the product's proper use, resulting in harm to the consumer. This type of defect can also include a failure to provide adequate instructions for assembly or installation. For example, a power tool that does not include proper warnings about the dangers of using it near water.

It's worth noting that a product can have more than one type of defect. For instance, a product may have a design defect that makes it inherently dangerous, and also a failure to warn defect because the manufacturer did not provide adequate warnings or instructions about how to use the product safely.

Understanding the type of defect involved in a product liability case is crucial in determining who is responsible for the harm caused and what legal remedies may be available to the injured party. If you've been injured or suffered damages due to a defective product, it is important to seek the advice of an experienced attorney who can help you understand your legal options.