NCIDQ IDFX Practice Exam

What does support ratio in foam cushions assess?

1. Durability

2. Weight distribution

3. Ratio of compressive force

4. Temperature retention

The correct answer is: Ratio of compressive force

The support ratio in foam cushions is a measure that quantifies the ratio of compressive force applied to a foam material relative to the deformations it undergoes. This assessment is crucial because it helps determine how well the foam can regain its shape and maintain support under weight. A higher support ratio indicates that the foam provides better support and resists excessive deformation, which is vital for ensuring comfort and longevity in seating and sleeping applications. Understanding the support ratio is essential for designers and manufacturers, as it affects product performance in real-world scenarios. It allows them to design foam products that not only provide comfort by conforming to the user's body but also maintain sufficient support to prevent discomfort and fatigue. While aspects like durability, weight distribution, and temperature retention are important, they relate to how the material performs over time, how it interacts with the user’s body, and how it reacts to thermal changes, respectively. However, the core function of the support ratio directly pertains to compressive force and the foam's ability to support weight effectively.