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LGA-Testing of MAL Mattresses for Quality and Physical Properties

For more than 20 years, MAL Mattresses are regularly tested by the Regional Industrial Institute (LGA) Nuremberg. The mattresses achieved test results of 98 points (out of 100 possible points). The mattresses manufactured in 2013 earned 100 points. Thereby MAL guarantees highest quality and durability.

 

Quality and Physical Properties Test according to DIN and ISO standards by LGA

The physical property of the mattress core and the hardness is essential to be checked as this ensures the quality and the life time of the mattress.

 

Hardness

The hardness and the density of a latex foam mattress core are interrelated. When the density increases the hardness value also increases. The Indentation Load Deflection (ILD) of hardness as per ISO 2439 standard states the constant force required to compress the mattress core to 25 %, 40 % or 60% of  its original height with a circular plate of 322 cm². The Compression Load Deflection (CLD) hardness as per ISO 3386 standard is the force applied to compress the mattress core 25 % of its original height measured in kPa (kilo Pascal).

 

Loss of springiness

This factor is a measure for the changes of the springiness and the elasticity of the mattress during the rolling process. It describes the extent to which the springiness curve during the rolling differs from the state of delivery.

 

 

Resilience/Elasticity

The Resilience/Elasticity is measured to ASTM 3574 standard by using a steel ball. The rebouncing of the ball is measured. On a latex foam core the rebounce factor is higher than 60% to 70%. This is much higher compared to synthetic foams.

 

Sag-Factor

It is important that the surface of the mattress core is soft and when pressure is applied, resistance increases up to a certrainstop point. The sag factor is described in ISO 2439 standard. The higher this index, the better the foam supports the body contour. The natural latex foam obviously gives a better a sag factor than synthetic foam or coil springs.

 

Durability/Lifetime

The most accepted method is to test the mattress core to the standards of EN 1957. A weight of 1,400 Newton is rolled 30,000 times up and down on the mattress core. Afterwards the height, the hardness and elasticity are measured. This is repeated once again and the results are compared with the original values. The average incline of the hardness is determined at 210 N, 275 N and 340 N in the load deformation curve.

Tests of natural latex cores performed by LGA Germany as per EN 1957 specifications showed about 3 mm loss in thickness and 3 % loss in hardness for a latex mattress core.

The other method is to test according to ISO 3385 (DIN 5374) standard, a foam sample of 40 x 40 cm forced with a weight of 750 N for 80,000 times at 70 strokes in the minute. Afterwards, the loss of height and the hardness is compared with the original value.

 

 

Hysteresis

The hysteresis can be determined by measuring the “banana foam” curve via loading and de-loading of a mattress. The load deformation curve is measured by means of a circular plate of 355 mm diameter, that gradually builds a force  up to 1,000 Newton.

The hysteresis is calculated with the load and de-load curve by the load surface. The hysteresis indicates the amount of energy that is absorbed by the latex core during loading / de-loading. The higher the absorption of energy by a mattress core, the more strength / energy is required to change the position on the mattress. Mattress cores which are too soft have a low hysteresis, resulting in higher energy requirement for changing the position on the mattress core. This results in a poor sleeping quality. Mattress cores with hysteresis testing of between 20 - 30 % are considered as comfortable.

M A L natural latex mattress cores are being tested as per ISO 3386 standard in the production. Regular testing is being done by LGA as per EN 1957 as MAL has a monitoring contract with LGA, Germany.

 

Environment

Waste water treatment plant is designed by Rubberised Institute (RRI) of Sri Lanka. The BOD and the COD levels are daily / weekly tested and controlled by our own laboratories. Periodical test being done by RRI.

 

 

Waste recycling

Waste and scrapped being disposed to small and cottage industries, where they produce different products with waste and scrap.