SN/T 5240-2020 in English

VALID

Import and export textiles-Heat release rate-Test method of cone calorimeter method

Issued on:2020-08-27
Implemented on:2021-03-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	SN/T 5240-2020
Document status:	VALID
Title in English:	Import and export textiles-Heat release rate-Test method of cone calorimeter method
Title in Chinese:	进出口纺织品热释放速率测定锥形量热仪法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-08-27
Implemented on:	2021-03-01
Professional Classification:	SN-Import&Export Inspection
Related Keywords:	cone calorimeter method introduction technical background rate-test method key equipment cone calorimeter testing method radiation cone
Related Topics:	Calorimeter Thermal conductivity meter Cone Calorimeter Quality heat meter Large Cone Calorimeter Variety Thermometer Taper amount Micro Cone Calorimeter Thermal conductivity meter Cone Calorimeter Large Cone calorimeter Thermometer Products cone calorimetry calorimetry exothermic instrument import micro cone calorimetry Column derivatizer import and export Cone calorimeter sample preparation Cone Calorimeter Test Cone Calorimeter + Test Cone Calorimeter Cone Calorimeter Based on cone calorimeter accelerated calorimetry Thermometer For calorimeters Cone calorimeter used Determination method of heat sealer Calorimetry Instrument import and export Instrument import and export Rapid Thermal Conductivity Meter accelerated calorimetry Cone gauge Imported centering instrument For calorimeters total heat release Calorific value How the heat release rate is measured Quantitative calorimeter heat release rate rate instrument exothermic peak heat cone method rate instrument Yield rate Yield rate Imported brand Thermal speed working instrument Heat release rate Calorimeter Calorimeter Multi-purpose calorimeter heat release accelerated adiabatic calorimeter arc Imported pure water meter What is the general heat capacity of a calorimeter? SDACM4000 calorimeter Calorimeter Parr6400 Testing of thermal transmittance, thermal reflectivity and thermal absorptivity of textiles Cone penetration import Export textiles Textile export inspection related Cone calorimeter test method steps China Customs Textile Import Quality Calorimeter identification Drug release rate measurement method

Introduction

Technical background and evolution of the standard

As an important technical specification issued by the General Administration of Customs in 2020, this standard fills the gap in the testing method for quantitative evaluation of the flammability of textiles. Its technical framework is inherited from GB/T 16172-2007 building materials test method, but three major innovations have been made for the characteristics of textiles:

Sample treatment: Add aluminum foil wrapping process to control edge burning effect
Radiation parameters: Set three levels of radiation illumination of 25/35/50 kW/m² to correspond to different fire scales
Termination conditions: Clarify the termination judgment criteria for 4 types of tests

Analysis of core detection principles

Heat release rate calculation formula based on the oxygen consumption principle:

q_A(t) = 1.10×13.1×10³×C×(Δp/√T_e)×(X_O2⁰-X_O2)/(1.105-1.5X_O2)/0.0088

Key parameters in the formula:

Parameter	Physical meaning	Unit	Acquisition method
C	Instrument calibration constant	m^1/2·g^1/2·K^1/2	Equipment calibration value
Δp	Orifice pressure difference	Pa	Real-time monitoring
X_O2⁰	Initial oxygen concentration	mol/mol	60-second average value

Technical requirements for key equipment

Cone calorimeter as the core equipment must meet the following requirements:

Radiation uniformity: Deviation within 50×50mm range ≤±2%
Oxygen analyzer accuracy: 30-minute drift <50ppm
Weighing system: Response time <4s, range ≥500g

Appendix A specifies the equipment structure requirements in detail, including the dimensional tolerances of key components such as the radiation cone (Figure A.1) and the positioning frame (Figure A.3).

Standardized operating procedures

Sample preparation: Three layers of 100×100mm samples stacked, wrapped in aluminum foil (3mm beyond the upper surface)
Environmental control: Temperature 15-30℃, humidity 20-80%
Radiation calibration: Cone distance from sample (25±1)mm
Ignition procedure: Water-cooled/non-water-cooled shielding layer difference operation
Data acquisition: Oxygen concentration is recorded every 5 seconds until the termination condition is triggered

Implementation suggestions and risk control

Case: In the test of a flame-retardant curtain for an export, flash fire occurred under 50kW/m² radiation. Valid data was obtained by adjusting the sample positioning method (horizontal→vertical).

Special situation handling:

Short-term combustion: duration 1-10s needs to be recorded separately
Toxic gas: forced exhaust system must be equipped
Abnormal data: check the saturation status of the CO₂ filter

More samples: YD/T 3934-2021 JJG 21-2008 GB 18306-2015

Sample only — not a preview of SN/T 5240-2020

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