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Accreditations/ Listings*

NVLAP Accredited:

Lab Code: 200291-0
IAS Accredited**:
Testing Laboratory 216
City of New York, OTCR (MEA)
Acceptance Laboratory
No. 102-01-L
California State Fire Marshal
Approved Testing Laboratory
Florida Building Commission
Approved Product Testing Laboratory
Ohio Board of Building Standards
Recognized Testing Laboratory
UL's Third Party Test Data Program (TPTDP)
Acoustical Testing

ISO/IEC 17025 Compliant

* The specific tests accredited or listed by each organization may be referenced in the Scope under our lab's identification or code number.

** IAS is a subsidiary of ICC.

  NGC Testing Services-> Acoustical Testing

Information on NGC Testing Services' acoustical testing, including a description of facilities, a list of test services and applicable test standards.

Facilities and Equipment

The acoustical laboratory complex consists of a series of nine full-scale, fully isolated, independent test chambers, plus a control room containing state-of-the art instrumentation. With overhead crane capabilities, NGC Testing Services can build floor-ceiling specimens outside of the chamber and then simply move them inside, resulting in less time and expense.<

Our acoustical testing facilities include the following:

Partition Sound Transmission Loss Chambers

Sound Transmission Class (STC).

For evaluating:

  • Partitions
  • Building walls
  • Doors
  • Windows
  • Barriers
Ceiling Attenuation Chambers

Ceiling Attenuation Class (CAC).

For evaluating:

  • Ceiling tile
  • Suspended-ceiling systems
Sound Absorption Chamber

Noise Reduction Coefficient (NRC)

For evaluating:

  • Finishes
  • Ceiling tile
  • Insulation
  • Office screens
  • Space absorbers
  • Baffles
Sound Transmission Chamber

Insertion loss of mechanical insulation products and sound transmission of smaller-scale test specimens.

For evaluating:

  • Pipe lagging systems
  • Smaller-scale sound transmission tests
  • Automotive barriers
Floor-Ceiling Chambers

Sound Transmission Class (STC), Impact Insulation Class (IIC) and Reduction in Impact Sound Transmission (Delta IIC).

Multiple test frame and overhead crane capabilities for evaluating:

  • Floor-Ceiling assemblies
Hemi-Anechoic Test Chamber

Articulation Class (AC) for Open Office Components, Specialty Acoustic Measurements.

For evaluating:

  • Ceiling tile and systems
  • Wall treatments
  • Open office furniture/dividers

Additional facilities for developing custom test programs to evaluate acoustical performance of a wide range of products.


Test Capabilities

  • ASTM E 90 - Measurement of Airborne Sound Transmission loss of building partitions
    (ISO 140, Part 3)
  • ASTM E 413 - Classification of Rating Sound Insulation (STC)
  • ASTM E 1111 - Measurement of the Interzone Attenuation of Open Office Components
  • ASTM E 1332 - Standard classification for determination of Outdoor-Indoor Transmission Class (OITC)
  • ASTM E 1408 - Measures the sound transmission loss of door panels and door systems
  • ASTM E 1414 - Standard test for airborne sound attenuation between rooms sharing a common ceiling plenum (ISO 140, Part9)
  • ASTM C 423 - Sound absorption and sound absorption coefficients by the reverberation room method (ISO 354)
  • ASTM E 1222 - Test for the insertion loss of pipe lagging systems
  • ASTM E 492 - Test for impact sound transmission through floor-ceiling assemblies using the tapping machine
  • ASTM E 2179 - Test for the effectiveness of floor coverings in reducing impact sound transmission through concrete floors
  • ASTM E 989 - For determination of Impact Transmission Class (IIC)
  • ASTM E 1110 - For determination of Articulation Class (AC)
  • SAE J1400 - Automotive barriers
  • ANSI S12.31 - To determine sound power levels of broad-band noise sources in reverberation rooms
  • ANSI S12.32 - To determine sound power levels of discrete-frequency and narrow-band noise sources in reverberation rooms

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