AcousticMod PET acoustic felt achieved a Flame Spread Index of 5 and a Smoke Developed Index of 300 in ASTM E84 testing conducted by Intertek. Both results meet the numerical Class A criteria referenced by the International Building Code.
Independent laboratory testing • Houston, Texas, USA
The reported values for the identified PET felt specimen are within Class A limits for surface burning characteristics. Final project acceptance depends on the applicable code, installation and authority having jurisdiction.
ASTM E84 evaluates flame spread and smoke development under standardized laboratory conditions. These two indexes provide essential information for reviewing interior finish materials.
A Flame Spread Index of 5 is below the Class A maximum of 25. This index measures relative flame travel across the exposed material surface during the test.
Lower FSI values represent less relative surface flame spread under the test conditions.
A Smoke Developed Index of 300 is within the Class A limit of 450. This index evaluates relative smoke generation during the standardized test.
Smoke development is evaluated separately from the flame spread measurement.
These charts compare the reported indexes with their respective Class A maximum values. They do not represent percentages of fire resistance or overall fire safety.
IBC interior finish classification criteria use the following flame spread and smoke development limits for materials evaluated under ASTM E84 or UL 723.
| Classification | Flame Spread Index | Smoke Developed Index |
|---|---|---|
| AClass ATested AcousticMod PET felt values fall in this range | 0 to 25Reported FSI: 5 | 0 to 450Reported SDI: 300 |
| BClass B | 26 to 75 | 0 to 450 |
| CClass C | 76 to 200 | 0 to 450 |
Important: The reported specimen results meet the Class A numerical criteria. This comparison is not a separate product certificate, a fire resistance rating or an approval of every AcousticMod product.
ASTM E84, commonly called the Steiner Tunnel Test, is a standard test method used in the United States to evaluate the surface burning characteristics of building materials.
It measures relative flame spread and smoke development under controlled laboratory conditions. These values help architects and project teams evaluate materials against applicable requirements.
The laboratory prepares and mounts the specimen according to the applicable test method.
Flame travel and smoke development are evaluated during controlled laboratory testing.
Flame Spread Index and Smoke Developed Index values are documented for the tested material.
Specimen identification and test conditions are critical when reviewing laboratory results for architectural specifications and commercial submittals.
Test scope: The reported values apply to the identified Base Light Grey PET felt specimen. Other colors, thicknesses, adhesives, wood elements, mounting arrangements and complete acoustic assemblies should be checked against their own applicable documentation. Intertek has indicated that the test report, rather than a separate Class A certificate, is the final deliverable.
Fire performance information is especially important when acoustic materials are evaluated for professional building projects.
Review fire performance criteria when selecting interior finishes for workplaces, hospitality and other commercial environments.
Request available material documentation for design review, specification schedules and contractor coordination.
Compare the documented specimen results with the classification limits relevant to your project and jurisdiction.
Confirm whether the selected product, material construction and installation are covered by the relevant test report.
AcousticMod develops acoustic solutions for residential and commercial interiors, combining sound management with material finishes that complement contemporary architecture.
Our range includes PET felt products, acoustic baffles and wood slat wall panels. Different product constructions can have different fire performance characteristics, so selecting the correct documentation is an essential part of the specification process.
Contact our team with the selected product, finish, installation method and project location to discuss available technical documentation.
Use this simple interactive checklist to organize the key details before requesting fire test documentation for an acoustic installation.
It is a planning tool and does not replace the project's building code review or approval process.
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AcousticMod maintains an office and warehouse presence in Houston, Texas, supporting customers across the United States with product inquiries, project coordination and available technical documentation.
Direct access to our U.S. team for product questions, specifications and project discussions.
Domestic warehouse operations supporting eligible product orders and fulfillment, subject to inventory availability.
Help with identifying applicable product documentation for architectural and commercial projects.
Common questions from architects, contractors and customers evaluating fire tested acoustic materials.
ASTM E84 is a laboratory test method that evaluates surface burning characteristics. It measures relative flame spread and smoke development and reports these results as FSI and SDI values.
Class A corresponds to a Flame Spread Index of 0 to 25 and a Smoke Developed Index of 0 to 450 under the referenced IBC interior finish classification criteria.
Yes. The reported Intertek results for the identified Base Light Grey PET felt specimen are FSI 5 and SDI 300. Both values meet the numerical Class A criteria.
No. Class A describes surface burning classification criteria. It does not mean the material is fireproof, noncombustible or approved for all installation conditions.
No. A one hour fire resistance rating is associated with a different type of testing for fire resistance rated building assemblies. ASTM E84 evaluates surface burning characteristics.
Not automatically. The documented test values apply to the identified specimen. Other product constructions, colors, thicknesses, adhesives and finished assemblies require confirmation of applicable documentation.
Intertek has confirmed that the laboratory test report is the final deliverable for this testing process. A separate Class A certificate is not issued.
Laboratory reports may be reviewed during architectural material selection and project submittals. Their acceptance depends on applicable building codes, the actual installation and project requirements.
ASTM E84 measures surface burning characteristics. NRC stands for Noise Reduction Coefficient and describes sound absorption performance. They evaluate different material properties.
Email info@acousticmod.com or call +1 346-575-3132. Provide the product, finish, project location and documentation requirements for assistance.
Connect with our Houston team for ASTM E84 test report requests, material questions and commercial project specifications.
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