GB/T 39764-2021 in English

GB/T39764-2021 stipulates the use of a detection system that uses a VOCs rapid analyzer in conjunction with a on-site rapid collection equipment to achieve on-site rapid determination of VOCs on the surface of soft furniture through hot air accelerated release (40±2℃) and nitrogen purge technology.

Equipment selection requirements

The detection system must include a collection device that complies with GB/T39763, of which the mixed filter tube should be loaded with activated carbon and Tenax-TA adsorbent at the same time, and the blank value of a single VOCs is ≤2ng.

Background control technology

Two background purification schemes are provided: internal circulation mode (600mL/min circulation for 30min) or nitrogen purge (1L/min purge for 18min) to ensure that the concentration of environmental interfering VOCs is lower than the detection limit.

Taking mattress manufacturers as an example, attention should be paid when implementing this standard:

1. The detection area should avoid uneven areas such as seams/fasteners
2. The total sampling volume should not exceed 80% of the cover volume
3. Formaldehyde detection should be completed within 30 seconds after cyclic enrichment

Typical detection cases show that the use of 40℃ heating enrichment can increase VOCs release by 2-3 times, significantly shortening the detection cycle.

Compared with traditional laboratory testing methods, the innovations of this standard are:

• Establishing a rapid on-site testing method system for the first time
• Introducing a dynamic background purification mechanism
• Clearing the detection limit requirements for 11 characteristic pollutants

This standard complements the GB/T18883 indoor air quality standard and improves the VOCs control system for the entire furniture product chain.