Acoustic Absorber Aptflex F48P - Precision Acoustics

Description

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