SN/T 5346-2021 in English

VALID

Coating powders - Determination of volatile organic compound (VOC) content

Issued on:2021-11-22
Implemented on:2022-06-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
$117.00

Standard No:	SN/T 5346-2021
Document status:	VALID
Title in English:	Coating powders - Determination of volatile organic compound (VOC) content
Title in Chinese:	粉末涂料挥发性有机化合物（VOC）的测定
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-11-22
Implemented on:	2022-06-01
Professional Classification:	SN-Import&Export Inspection
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Introduction

Analysis of standard technical framework

Test items	Method principle	Key parameters	Instrument requirements
Total volatile matter	200℃ constant weight method	Heating for 20min, accuracy 0.0001g	Constant temperature oven with blast air (±3.5℃)
Water content	Karl Fischer titration	Drift value<10μg/min	Water titrator
Density determination	Liquid displacement method	23℃±0.5℃ constant temperature	Lee density bottle (250mL)

Core operation points

Key to total volatile matter determination

Use metal/glass flat bottom dish (75±1mm) to weigh 1g sample. When treated at 200℃, ensure that the oven temperature fluctuation is ≤3.5℃. The relative deviation of the results of two parallel tests should be <10%.

Karl Fischer Method Precautions

Special reagents must be used for samples containing aldehydes and ketones, and water calibration must be performed before titration (the difference between two calibrations is <0.01mg/mL). The sample volume is 0.5-2g, and the result is rounded to two decimal places.

Recommendations for the implementation of the standard

Equipment verification: Regularly calibrate the constant temperature water bath (0.1℃ accuracy) and balance (0.0001g sensitivity)
Reagent management: The replacement liquid should be an aliphatic hydrocarbon with a boiling point of 80-140℃, and n-heptane is a common choice
Result calculation: VOC(g/L)=[(W1-W2)×ρ]×10, where W1 is the total volatile matter%, W2 is the water content, and ρ is the density g/mL

Technology evolution analysis

Compared with the earlier methods, this standard: ① Specified 200℃ as the unified test temperature ② Introduced the Karl Fischer titrator to improve the accuracy of moisture detection ③ The standardized operation procedures for the Lee density bottle are specified. When implementing, attention should be paid to the aldehyde and ketone sample handling requirements specifically pointed out in the standard.

More samples: GB 18306-2015 DL/T 368-2010 JGJ 94-2008

Sample only — not a preview of SN/T 5346-2021

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