About Alion

Labs and Facilities

Test Specifications

Riverbank conducts the following standard tests and provides clients with the designated information:

Diffuse Field Sound Absorption: ASTM C423 & E795

  • Absorption Coefficients
  • Reverberation Time (T60)
  • Sabins and M2 reported
  • Noise Reduction Coefficient (NRC)
  • Sound Absorption Average (SAA)
  • Extended frequency range included with all tests (31.5 Hz to 12,500 Hz)
  • Mounting Types: A through M, E-400
  • Room rental available for research & development work
  • ISO 354 available

Normal Incidence Sound Absorption: ASTM E1050

  • Impedance Tube Testing
  • 100 mm diameter large tube (80 Hz – 1.6 kHz)
  • 29 mm diameter small tube (500 Hz – 6.4 kHz)
  • Cost-effective rates for research & development work

Sound Transmission Loss: ASTM E90 & E413

  • Noise Reduction (NR) Values
  • Transmission Loss (TL) Values
  • ASTM E1332 Outdoor-Indoor Sound Attenuation Rating (OITC)
  • SAE J1400 Airborne Sound Barrier Performance
  • Extended frequency range available (31.5 Hz to 12,500 Hz)
  • Room rental available for research & development work

Impact Sound Transmission: ASTM E492 & E989

  • Impact Insulation Class (IIC)
  • Normalized Sound Pressure Levels (Ln)
  • Extended frequency range available

Delta IIC

  • Effectiveness of Floor Coverings in Reducing Impact Sound Transmission through Concrete Floors: ASTM E2179 & E989 (Class Determination)
  • Measures improvement in impact insulation class due to the floor covering (ΔIIC)
  • Frequencies, 21 1/3 octave bands, 50 to 5000 Hz
  • Reduction in impact sound pressure levels (Lref, c)

Acoustic Isolation Enclosures

  • ASTM E596: Noise Reduction of Sound-Isolating Enclosures
  • ANSI S3.1: Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms

Sound Power Ratings

  • ANSI, ARI, ISO, SAE, ASHRAE, MIL standards
  • NVLAP Accredited for ANSI S12.51 / ISO 3741
  • Direct/Absolute or Comparison Method
  • Spectrum, Averaged Sound Pressure (Lp) Values
  • Derived Sound Power (Lw) Values
  • Extended frequency range available
  • Discrete frequency determination (ARI) is available
  • Room rental available for research & development work

Reference Sound Source Calibration

  • ANSI S12.5 & S12.51
  • ISO 6926 & ISO 3741
  • Calibration Tests on all fan type reference sound sources, including: Acculab RSS, ILG, Bruel & Kjaer Type 4204, G & G Acoustics, etc.

Sound Pressure Levels (Laboratory or Field)

  • 1/3 octave (Lp) dB Levels
  • Octave (Lp) dB Levels
  • dB(A) (Lp) dB Levels
  • FFT (Fast Fourier transform)

In-Situ Acoustical Tests

  • ASTM E336: Airborne Sound Attenuation between Rooms in Buildings (FSTC, ASTC, NR, NIC, ATL)
  • ASTM E1007: Field Measurement of Tapping Machine Impact Sound Transmission through Floor-Ceiling Assemblies (FIIC, AIIC, ANISPL, ISPL)
  • Sound Pressure Level (dB-SPL, 1/3 Octave Band, FFT)
  • Environmental Acoustic Surveys
  • Reverberation Time (T30, T20, etc.)
  • Vibration (FFT)