ASTM E84 Steiner Tunnel Test Furnace | Flame Spread & Smoke Density Fire Test Equipment Manufacturer

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Parameters

Parameter	Specification
Test Method	ASTM E84 / NFPA 255 / UL 723
Flame Source	Dual-head nozzle of tunnel furnace
Test Duration	10 minutes
Measured Indicators	Flame Spread Index (FSI), Smoke Developed Index (SDI)
FSI Classification	Class A: 0–25Class B: 26–75Class C: 76–200
SDI Range	0–450
Applicable Materials	Wood, composite panels, decorative materials, insulation/thermal materials

Features

Accurate Measurement: Quantifies fire performance through FSI and SDI values.

Multi-Standard Compliance: Supports ASTM, UL, NFPA, and other international standards.

Safe and Reliable: Controlled testing process ensures stable and repeatable data.

Easy Operation: Simple sample installation and test procedure suitable for routine lab use.

Wide Applicability: Covers interior and exterior decoration, insulation materials, and furniture panels.

Accessories

Tunnel furnace main unit

Dual-head flame nozzle

Sample mounting fixtures

Smoke collection and analysis system

Data acquisition and recording system

Test Procedures

Mount the test sample on the sample rack at the top of the tunnel furnace.

Start the tunnel furnace; flames are emitted from the dual-head nozzle onto the sample.

Conduct the test for 10 minutes, recording flame spread and smoke development.

Calculate the Flame Spread Index (FSI) based on flame propagation distance and time.

Measure the Smoke Developed Index (SDI) and classify the material according to ASTM E84 standards.

Maintenance Information

Regularly clean the flame nozzles and furnace to remove carbon deposits for uniform flame distribution.

Calibrate smoke collection devices and sensors quarterly to ensure accurate measurements.

Keep sample fixtures and supports intact to prevent deformation affecting results.

Turn off power and ventilate the lab after use to prevent smoke residue from damaging equipment.

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