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From Consumerlab.com, a highly reputable subscription website with objective analysis of consumer health products, mostly supplements:

Heating kills coronavirus

Heat is very effective at sanitizing and disinfecting objects from coronavirus. In fact, the SARS-CoV-2 virus that causes COVID-19 may be even more sensitive to heat than the earlier SARS-CoV virus. Experiments done in China in 2002 with SARS-CoV in culture medium (Duan, Biomed Env Sci 2003) showed that it became undetectable after 30 minutes when heated to a temperature of 167°F, but recent tests with SARS-CoV-2 in Hong Kong showed that it became undetectable after just five minutes at only 158°F (70°C). The time required to kill SARS-CoV-2 increased as the temperature was reduced, such that the time by which it was undetectable increased to 30 minutes at 132°F (56°C), two days at 98.6°F (37°C), and two weeks at 71.6°F (22°C). At 39°F (4°C) the virus remained detectable at two weeks when the experiment ended (Chin, Lancet 2020).

Coronavirus lasts longer on certain surfaces, particularly surgical masks!

The Hong Kong researchers noted above also placed a small amount of the SARS-CoV-2 on a variety of surfaces at room temperature (at 65% relative humidity) to see how long the virus would last before becoming undetectable. On tissue and regular paper it became undetectable within just 3 hours. On cloth and on paper money, it lasted 2 days. Surprisingly and disturbingly, it lasted longest on the outer layer of a surgical mask: Virus was detectable on the mask at day 7 (although at only 0.1% of its original level), which was also how long it lasted on plastic and stainless steel.

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I have seriously considered making a mask I can wash and dry in the dryer.  One that has a pouch pocket you can insert a rectangle of HEPA filter from a vacuum bag.  Lots of patterns online (YouTube ) .   Clean mask each wear.......with a decent filtering capability !

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