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Pressure-mapping equipment is often used to calculate the degree of weight distribution. During the mapping procedure, computer programs monitor pressure. The body's impression is graphed to show which areas endure the most pressure (namely the shoulder blades, posterior region, head, heels, calves, and elbows).

Some viscoelastic foam producers perform these tests as an indication of how well the foam might act to minimize pressure. In the healthcare area, to be labeled as providing "pressure relief," readings must be at 32mmHg or lower, whereas "pressure reduction" performance is agreed to occur between 32mmHg and 50mmHg. The above charts help illustrate the process and show some typical pressure readings for viscoelastic foam. When readings made on viscoelastic products are compared to those of conventional foam and other common cushioning surfaces, the pressure differences are notable

Summary

Viscoelastic foam technology represents new and exciting developments. It is taking hold in a variety of markets (from medical to bedding to technical applications and more) and offers a unique cushioning alternative to conventional and HR flexible polyurethane foams. Its performance in specialized end-use applications has been well received by consumers. Ongoing industry and individual efforts are focused on improving the control of viscoelastic foam's performance, so that more successful applications can be developed for this unique cushioning, pressure distribution and shock absorbing material.

Viscoelastic foam is a type of open cell, flexible polyurethane foam.
Surface comfort and pressure distribution are closely related to the foam's ability to conform to body shape.
Slow recovery adds comfort characteristics.
Viscoelastic foam firmness, support and height recovery rate are often affected by temperature and humidity.

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