Aptflex F28P

Pyramidal structured absorber for radiation force balance targets for acoustic power greater than 2W but less than 100W



NPL Technology AppliedThe combination of the acoustic and physical properties of the Aptflex F28P acoustic absorber makes it the cost-effective solution for a Radiation Force Balance target for devices measuring acoustic power in the range 2-100W.

Physical Specification

  • Based on a polyurethane rubber material,single-ply nominally homogeneous layer.
  • Pyramidal structured surface with maximum thickness of tiles:8mm.
  • Tile dimensions: 200mm X 250mm x 10mm.
  • Coefficient of Linear thermal expansion: 200ppm/oC.
  • Specific gravity is 1.01g/cm3 is close to that of water.
  • Longitudinal wave speed (1-10MHz) is ≈1500 m/s.
  • Acoustic Impedance is 1.5 MRayls.
  • There is a resistance to Isopropyl Alcohol (IPA) and Trichloroethylene.
  • It can be affected by ketones (MEK, Acetone) which causes it to Swell and Dichloromethane which also cause swelling and break down.
  • Avoid prolonged exposure to Ozone and UV.
  • The stability of F28P is very stable due to cross-linked nature of polymer.
  • The material can be cut with a sharp craft knife to make  various geometries to meet exact
    end-user requirements.

Acoustical Specification

  • High transmission loss, approximated by 20dB/cm/MHz.
  • High echo-reduction, greater than 20dB at 1MHz, to greater than 40dB above 6MHz.

Contact Us

If you would like more information about this product please get in touch by phone, email or enquiry form.

+44 (0) 1305 264669

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Additional information

Product Type

Anechoic Absorbers