ASTM E662-14 Specific Optical Density of Smoke

ASTM E662-14 fire-test response determines the specific optical density of smoke produced by solid materials and assemblies. The final values are expressed in inch pound units which are considered as standard.

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ASTM E662-14 Specific Optical Density of Smoke

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

The specific optical density of smoke testing, as per the ASTM E 662 method, is a standardized test procedure used to determine the specific optical density of the smoke produced by solid materials and assemblies under flaming and non-flaming combustion conditions. The ASTM E 662 specific optical density of smoke testing method clearly outlines specimen preparation, the NBS smoke chamber, and the specific optical density measurement requirements for assessing smoke density.

Scope, Applications, and Benefits

Scope

ASTM E662 test method for evaluating smoke generation in solid materials involves exposing specific test specimens to a known radiant heat flux in the NBS smoke density chamber, with the test being conducted in both flaming and non-flaming exposure modes to measure the attenuation of a light beam passing through the smoke to determine specific optical density as a function of time.

ASTM E 662 specific optical density testing evaluates:

Specific optical density of smoke generated by plastic, composite, and building materials
Comparative smoke generation under flaming and non-flaming combustion conditions
Maximum specific optical density and smoke density rating of solid material specimens
Effect of material composition, thickness, and surface treatment on smoke generation
Compliance with defined maximum specific optical density requirements for materials

Applications

Interior finish materials, wall panels, and ceiling systems for public occupancy buildings
Plastic and composite materials for transportation, aerospace, and rail vehicle interiors
Electrical cable insulation and jacketing materials requiring smoke density assessment
Building products, furniture components, and upholstery materials for fire smoke evaluation
Material suppliers and manufacturers requiring ASTM E 662 smoke density test data

Benefits

Provides reliable specific optical density data for material smoke generation assessment
Supports building code, transportation, and fire authority smoke density compliance
Identifies excessive smoke generation in materials before installation or deployment
Delivers traceable smoke density test records for engineering and regulatory submissions
Reduces life-safety risk by verifying material smoke generation performance early in approval

Test Process

Sample Preparation

Specimens cut to defined dimensions and conditioned per ASTM E 662 requirements.

Radiant Heat Exposure

Specimens exposed to defined radiant heat flux in NBS smoke chamber under flaming or non-flaming mode.

Optical Density Measurement

Light beam attenuation through accumulated smoke measured using calibrated photometer system.

Data Analysis & Reporting

Specific optical density calculated and assessed against criteria for test compliance result.

Technical Specifications

Parameter	Details
Applicable Materials	Plastics, composites, building materials, electrical cables, and interior finish materials
Specimen Geometry	Defined specimen dimensions per ASTM E 662 NBS chamber requirements
Exposure Conditions	Defined radiant heat flux under flaming and non-flaming exposure modes
Measured Parameters	Light transmittance, specific optical density, and maximum smoke density value
Measured Outputs	Optical density curves, maximum specific optical density, and test compliance result

Instrumentation Used for Testing

NBS smoke density chamber per ASTM E 662 apparatus specifications
Calibrated radiant heat flux panel for defined heat exposure conditions
Photometer system for light beam transmittance and optical density measurement
Pilot flame ignition system for flaming mode exposure
Specimen conditioning chamber with temperature and humidity control
Data acquisition and test reporting system

Results and Deliverables

Specific optical density curves as a function of exposure time for all tested specimens
Maximum specific optical density values under flaming and non-flaming conditions
Comparative smoke density data across flaming and non-flaming exposure modes
Test compliance result assessed against defined maximum optical density requirements
ASTM E 662 smoke density test report

Why Choose Infinita Lab for ASTM E 662?

Infinita Lab is a trusted USA-based testing laboratory offering ASTM E 662 testing services across an extensive network of accredited facilities across the USA. Infinita Lab is built to serve the full spectrum of modern testing needs—across industries, materials, and methodologies. Our advanced equipment and expert professionals deliver highly accurate and prompt test results, helping businesses achieve quality compliance and product reliability.

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Frequently Asked Questions

ASTM E662-14 measures the specific optical density of smoke produced by solid materials in both controlled flaming and non-flaming conditions. It helps assess how smoke can cut visibility during a fire in enclosed spaces.

Specific optical density shows how much smoke reduces visibility during a fire. ASTM E662-14 helps evaluate materials used in transportation, aerospace, and buildings where smoke can make evacuation and rescue difficult.

ASTM E662-14 is commonly used for plastics, cables, interior panels, insulation, textiles, and other materials found in aircraft, rail vehicles, ships, and buildings that require smoke generation testing.

ASTM E662-14 testing places a specimen in a sealed chamber. It exposes the specimen to controlled radiant heat, with or without flame. The test measures smoke optical density using a light transmission system.

ASTM E662-14 measures smoke density in a lab setting. It does not assess toxicity, flame spread, or real-life fire behavior. Additional tests are needed for a complete fire safety evaluation.