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2. Directive 2000/39/EC Indicative Occupational Exposure Limit Values https://www.osha.europa.eu/en/legislation/directives/exposure-to-chemical-agents-and-chemical-safety/osh-directives/directive-2000-39-ec-indicative-occupational-exposure-limit-values 2013
3. Emergency Response Guidelines for Anhydrous Hydrogen Fluoride (HF) 2007 http://www.americanchemistry.com/ProductsTechnology/Hydrogen-Fluoride-2/Emergency-Response-Guidelines-for-AHF.pdf 2013
4. Fibres 2004 36
5. Flammability of Fluoropolymers