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.
- 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
|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)
|Affected by||Ketones (MEK, Acetone) – Swell
Dichloromethane – Swell and Break down
|Avoid prolonged exposure to||Ozone
|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.