ASTM D2843 Smoke Density Testing from Burning & Decomposition of Plastics
ASTM D2843 is a standard test method for measuring the smoke obscuration produced by the burning or decomposition of plastics. It evaluates the smoke-producing characteristics of plastics under controlled combustion or decomposition conditions.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D2843 defines a standardised method for measuring the density of smoke generated when plastic materials burn or thermally decompose. Smoke density is a critical fire safety parameter because dense smoke impairs visibility, hinders evacuation, and contributes to toxicity hazards in enclosed spaces. This test provides a practical ranking of plastics based on their smoke-generation potential.
The test uses the XP-2 smoke chamber (NBS smoke chamber), in which a small specimen is exposed to a radiant heat source with or without a pilot flame. As the specimen burns or pyrolyses, smoke accumulates in the closed chamber and is measured photometrically. The specific optical density (Ds) is calculated from the light attenuation through the smoke, and the maximum specific optical density (Dmax) is reported as the key result.
Scope, Applications, and Benefits
Scope
ASTM D2843 evaluates:
- Maximum specific optical density of smoke (Dmax)
- Smoke density as a function of time
- Rate of smoke development from plastics
- Comparative smoke generation ranking of plastic materials
- Effect of flaming vs. non-flaming combustion on smoke density
- Influence of specimen thickness and density on smoke output
Applications
- Building and construction plastic materials
- Electrical wire and cable insulation
- Transportation (aircraft, rail, marine) interior materials
- Appliance and consumer product plastic components
- Construction panels and cladding
- Fire safety material qualification
- Regulatory compliance testing
Benefits
- Quantifies smoke hazard potential of plastic materials
- Supports material selection for low-smoke applications
- Enables compliance with fire safety regulations
- Provides data for building code approvals
- Ranks materials for evacuation safety assessments
- Guides formulation of low-smoke plastic compounds
Test Process
Specimen Preparation
Plastic specimens are cut to the specified dimensions (75 × 75 mm) and measured for thickness.
1Chamber Setup
The XP-2 smoke chamber is calibrated and the photometric system is zeroed.
2Combustion Exposure
Specimen is exposed to the radiant heater with or without a pilot flame.
3Optical Density Measurement
Light transmittance through the accumulated smoke is recorded continuously; Dmax is identified.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Plastic materials, polymer products, building plastics |
| Specimen Types | Sheet, molded, or formed plastic specimens |
| Heat Source | Controlled flame exposure |
| Test Environment | Controlled combustion chamber conditions |
| Test Modes | Flaming and non-flaming |
| Specimen Size | 75 mm × 75 mm |
Instrumentation Used for Testing
- XP-2 NBS smoke density chamber
- Radiant heating element and pilot flame
- Photometric light source and detector
- Data acquisition and recording system
- Specimen holder and mounting fixture
- Calibrated optical neutral density filters
Results and Deliverables
- Maximum specific optical density (Dmax)
- Specific optical density vs. time curve
- Area under the Ds-time curve (if required)
- Flaming vs. non-flaming mode comparison
- Fire safety classification report
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Frequently Asked Questions
The ASTM D2843 smoke density test measures the amount of smoke produced by materials when they are exposed to a flame or heat source.
This test compares the amount of smoke obscuration different plastics produce and determines the extent to which plastic materials are likely to smoke under conditions of active burning and decomposition in the presence of flame.
The test is performed inside a chamber measuring 3 m by 3 m by 3 m. Specimens are placed onto the specimen stand, and an alcohol fuel source is placed below it. At the start of the test, the fuel is ignited. The test duration is 40 minutes.
Smoke meters, also known as opacity meters, detect and measure the amount of light blocked in smoke emitted by diesel engines in cars, trucks, ships, buses, motorcycles, locomotives, and large stacks in industrial operations.
The basic principle of the smoke meter is in the measurement of exhaust gas emissions sucked through a filter paper. The blackening of filter paper is measured with a reflectometer, which indicates the soot content in the exhaust gas.
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