Metal finishing Q&As since 1989
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Humidity requirements for Methylene chloride vapor polish process
When vapor polishing polycarbonate parts with methylene chloride vapors is there is specific relative humidity requirement. For instance, if you vapor polish your polycarbonate in an atmosphere that has 75% relative humidity, will you get a cloudy / poor polish. If anyone knows what the upper spcecification limit for relative humidity is while vapor polishing PC parts with MeCl please let me know.
Kenneth SpinalePlastics Manufacturer / Machine shop - Beverly, Massachusetts
2005
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Ed. note, Feb. 24, 2012: Per www.cbc.ca/news/health/story/2012/02/24/bathtub-refinishing-deaths.html
"Methylene chloride ... has been linked to the deaths of 13 workers refinishing bathtubs in the United States...
To use products containing methylene chloride safely, work areas must be well-ventilated, and when levels of methylene chloride exceed recommended exposure limits, workers must use protective equipment ...
The finding has prompted the CDC to warn ... public health agencies, manufacturers and trade groups to 'communicate the extreme hazards' of the use of the chemical -- also known as dichloromethane -- to employers, workers and the public."
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