Mattress Firmness Rating Tester
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Mattress Firmness Rating Tester


  Mattress Firmness Rating Tester is a fully automated test systems, in line with technical

  requirements of ASTM F1566:2014 article 6. The instrument as an intelligent automatic testing system possesses the following functions: automatic data processing, display, printout and storage etc. The development and use of the system greatly enhances the automation and integration level of Firmness Rating Tester.

  Firmness Rating Test Procedure A:Testing Innersprings and Flexible Foundations

  Apparatus:BA-740AB Firmness Rating Tester

  1 Specimen—The unit to be tested is an un-upholstered mattress core or flexible

  foundation unit.

  2. Apparatus:

  2.1 Platen—The platen shall be a round rigid disk with a diameter of 344± 5 mm (13.54 ± 0.2 in.) connected to the loading mechanism with a flexible connection (see Fig. 1)。

  2.2 Loading Mechanism—A device capable of providing a load of 1335 N (300 lbf) or more with accuracy of ±1 %.

  2.3 Deflection Device—For use in determining deflection,that is, ruler or electronic device accurate to 1 mm (1?32 in.) with minimum stroke of 101.6 mm (4 in.)。

  3 Test Procedure:

  3.1 Place specimen directly onto a rigid, flat surface.

  3.2 Run tests at four separate locations , Location 5 being optional.

  3.3 At each test location, determine resistance values in 2-N (0.5-lbf) increments at 12.5, 25, 38, 50, 63, and 76 mm(0.5, 1, 1.5, 2, 2.5, and 3 in.) with a tolerance of ±1 mm (60.04 in.) of deflection of the top surface for innersprings and 12.5 and 25 mm (0.5 and 1 in.) with a tolerance of ±1 mm (±0.04 in.) of deflection of the top surface for flexible foundations.

  3.4 The zero reference point shall be determined using a common contact force of 4.4 N (1 lb)。

  3.5 The test speed is 50 ± 5 mm/min (2 ±0.2 in./min)。

  4 Calculation/Results:

  4.1 Determine a firmness rating for a uniformly constructed innerspring unit by totaling resistance values at Locations 3 and 4 for all deflections and dividing the total by two for an average.

  4.2 Determine firmness rating for a non-uniformly constructed (posturized) innerspring unit by using resistance values at Location 3 only.

  4.3 Determine a firmness rating for the calf/shoulder area using the values at Location 4 only. Any difference between readings 3 and 4 will be calculated as a percentage of increase of Location 3 over the readings at Location 4.

  4.4 Determine a firmness rating for the edge by totaling the resistance values at Locations 1 and 2 for all deflections and dividing the total by two for an average.

  4.5 Optional—Determine a firmness rating of the corner by totaling the resistance value for all deflections at Location

  Article From   Author Bang Instrument co.,ltd
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