Based on your previous concerns regarding the detection, prevention, and treatment of volatile pollution from hot runner thread sealant, the following methods can be used to determine if volatile pollution exists:
I. Basic Visual Assessment
Sensory Screening: Observe whether the sealant has a noticeable pungent odor after use. If a pungent odor lingers for a long time, volatile pollution is highly likely.
Appearance-Based Assessment: If unidentified oily exudates appear on the surface of the workpiece around the hot runner, these are mostly small-molecule siloxane substances volatilized from the sealant, indicating volatile pollution.
II. Precise Laboratory Assessment
VOC Content Detection: Refer to GB 33372-2020 standard and use GC-MS (Gas Chromatography-Mass Spectrometry) for detection. If the VOC content is >100g/kg, excessive volatile pollution is identified.
High-Temperature Simulation Test: Place the sealant at the actual operating temperature of the hot runner and collect and quantitatively analyze the volatile gases. If the concentration of harmful components exceeds the safety threshold, volatile pollution is identified.
III. On-site Operating Condition Verification
Portable Instrument Testing: Use a PID photoionization detector to measure around the sealing points of the hot runner. If the real-time readings far exceed the workshop safety limits, it is determined that there is fugitive volatile pollution.
Compliance Verification: Verify the product test report. If it does not meet the limits for hazardous substances in adhesives such as GB 18583-2008, it can be directly determined that there is a risk of volatile pollution.
