Within the scope of assessment of body support, TÜV SÜD Product Service tested the following criteria:
1. Stability: To check stability, a load pad of 17.5 kg (hemispherical, 36 cm diameter) is dropped onto the mattress from a height of 30 cm and the vibrations of the mattress are measured. Depending on the extent of vibration and hardness or softness, the mattress is assigned a grade between 1 and 5
Stabilising after 30,000 and 120,000 cycles
- Grade 1 Only for systems with slatted frames that allow individual alignment
- Grade 2 4 – 5 vibrations (optimum value)
- Grade 3 3 – 2 vibrations (too hard)/6 – 7 (too soft)
- Grade 4 1 – 0 vibrations (too hard)/8 – 9 (too soft)
- Grade 5 >9 vibrations
2. Deformation Index: TÜV SÜD Product Service records the mattress's surface form by performing measurements with individuals of different heights and weights. Measurements cover the immersion (depth of sinking in) and the distance between two defined points. The test engineers summarise the angle resulting from the measurement in a deformation index, which is then evaluated from the perspective of industrial anthropology. In other words, the index shows mattress deformation caused by the body in various reclining positions. Depending on the mattress's deformation under load, the quality is graded from 1 to 5.
Deformation index after 30,000 and 120,000 cycles
- Grade 1 < 410
- Grade 2 410 – 420
- Grade 3 421 – 450
- Grade 4 451 – 480
- Grade 5 > 481
3. Distribution of pressure: The distribution of pressure is measured with the help of a pressure measuring platform (ABW system with 680 measurement points), which enables the contact pressure to be measured. The value provided refers to the measured maximum pressure (not including the back of the head and the heels) imposed by an “average” man and an “average” women (50th percentile) in supine position. Depending on the mattress's deformation under load, a grade from 1 to 3 is assigned. The higher the value in mmHG, the higher the pressure on the respective region.
Pressure distribution after 30,000 and 120,000 cycles
- Grade 1 < 20mmHg
- Grade 2 20mmHg – 69mmHg
- Grade 3 > 70mmHg
4. Contact area: This statement refers to the area of the body in contact with the surface of the mattress when the individual is reclining. The contact area is measured when an individual lies in a supine position on the mattress. Legs and arms are slightly spread. The result should be at least 30 percent, or preferably between 45 and 55 percent. The physiological upper limit of the contact area is 85 percent. For good support, the contact area should be neither too big nor too small. Depending on the contact area measured, a grade from 1 to 5 is assigned.
Contact area after 30,000 and 120,000 cycles
- Grade 1 46% – 55.9%
- Grade 2 36% – 45.9%/56% – 65.9%
- Grade 3 66% – 75.9%
- Grade 4 76 % – 84.9%/< 30%
- Grade 5 > 85%
5. Point elasticity: Point elasticity means that the mattress only yields where the body exercises direct pressure on the mattress. Mattresses with a high level of point elasticity are recommended as they provide more support to the body as a whole. Depending on the point elasticity measured, a grade from 1 to 3 will be assigned.
Point elasticity after 30,000 and 120,000 cycles
- Grade 1 > 65mm
- Grade 2 65mm – 45mm
- Grade 3 44.9mm–