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Precision Acoustics

Aptflex F48P

A high-performance acoustic absorbing tile designed to meet the requirements of applications in the frequency range 200 kHz to 1.5 MHz.

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aptflex f48p

Overview

AptFlex F48P, from Acoustic Polymers Ltd, is a high performance acoustic absorbing tile designed to meet the requirements of applications in the frequency range 200 kHz to 1.5 MHz. It is a micro-bubble filled, pre-cast polyurethane sheet. It is designed to exhibit very high levels of echo reduction and good insertion loss.

AptFlex F48P has a complex wedge structure on its outer surface to reduce specular reflections and provide geometrical acoustic impedance matching.

AptFlex F48P is part of a family of low-frequency acoustic absorbers and provides the highest levels of echo reduction, particularly in the 200 kHz to 1.5 MHz range. Whilst, AptFlex F48P provides moderate insertion loss, other tiles within the range offer slightly better performance in this respect at lower frequencies.

Physical Specification​

  • Absorbing targets for radiation force balances (up to 200 W)
  • Anechoic linings of small ultrasonic measurement tanks
  • Coating water tank fixtures to prevent unwanted reflections during ultrasonic measurements

Typical Properties

Appearance Pale blue polyurethane sheet
Dimensions of standard tile 195 mm diameter and 28 mm thick
Shore A hardness 87 ± 3
Density 1910 ± 20 kg / m3
Average wave speed (50-200 kHz) 990 ± 30 m / s
Acoustic impedance 1.89 MRayls
Tensile strength 3.7 ± 0.2 MPa
Poisson’s ratio (estimated) 0.48
Elongation at break 160 %
Resistant to Isopropyl Alcohol (IPA) Tricholethylene
Affected by Ketones (MEK, Acetone) – Swell Dichloromethane – Swell and Break down
Avoid prolonged exposure to Ozone UV
Stability Very stable due to cross-linked nature of polymer
Coefficient of linear thermal expansion 200 ppm / °C
Water absorption (2 years immersion) 0.8% increase in mass

Acoustic properties of F48P displayed within this TDS are preliminary data and may be subject to revision as more accurate data becomes available.