The average typing speed is 38-40 words per minute (wpm) for adults  in a professional working environment (despite many incorrect  reports on the web that it is 50-60 wpm).
Chronic Health Effects The following chronic (long-term) health effects can occur at some time after exposure to Mica and can last for months or years: Cancer Hazard * Some Silicas have been shown to cause cancer in animals. The risk of cancer in humans from Mica is unclear at this time.
Manufactured Mica means mica-based products manufactured from natural mica, such as, micanite or built-up mica, mica paper, mica heating elements, mica capacitors, mica flakes and powder, mica bricks, etc. Quality grading of mica The quality classification of mica, is based visual tests, depends on individual opinion.