Smoke Toxicity Test Equipment (Squirrel Cage Method)

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The GB/T 20285 Material Smoke Toxicity Test Apparatus (Mouse Cage Method) is a specialized testing system developed in accordance with GB/T 20285-2006 for evaluating the toxicity hazards of smoke generated by building materials during combustion. The apparatus is primarily used to assess the biological toxicity of smoke under stable smoke-generation conditions and serves as an important basis for determining the combustion performance classification of B- and C-grade composite (sandwich) building materials. By combining controlled thermal decomposition with animal exposure testing, the system provides a scientific and reliable method for fire safety evaluation of construction materials.

Standards

The test apparatus complies with the following national and international standards:

(1) GB/T 20285-2006 – Classification for Toxic Hazard of Smoke Generated by Materials

(2) ISO 19700:2006 – Controlled Equivalence Ratio Method for the Determination of Hazardous Components of Fire Effluents

(3) DIN 53436 – Testing of Thermal Decomposition Products of Materials under Ventilated Conditions and Their Toxicological Evaluation

Parameters

Item	Specification
Quartz Tube & Quartz Boat	Made of quartz glass
Quartz Tube Nominal Diameter	(36 ± 1) mm
Quartz Tube Wall Thickness	(2 ± 0.5) mm
Quartz Tube Length	1000–1300 mm
Quartz Tube Support	Adjustable horizontally and vertically
Smoke Collection & Distribution Assembly	Three-way stopcock, dilution gas inlet pipe, gas distribution elbow
Gas Flow Pipe Nominal Diameter	(36 ± 1) mm
Mouse Rotating Cage	Aluminum plate stamping
Rotating Cage Mass	(60 ± 10) g
Exposure Chamber	Transparent organic glass
Exposure Capacity	Up to 10 mice simultaneously
Temperature Control System	Thermocouple, cold-junction compensation, temperature controller, digital display
Furnace Movement Drive	Stepper motor
Movement Speed	(10 ± 0.1) mm/min
Adjustable Speed Range	5–50 mm/min
Maximum Travel Distance	> 600 mm
Carrier & Dilution Gas	Compressed air
Air Flow Rate	0–20 L/min adjustable

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