The information is here, use the search box, it has been working, rather well lately.

This is copied from a post of Burnt Toast. And most likely the reason, you have had no response. This question comes up frequently.:rasta: pr

Microwaving will not harm pre-mixed synthetic samples as long as theyre not brought to a boil.
In fact, synthetic brands such as Quick Fix, UltraPure, Magnum, etc; instruct the user to microwave the bottle for initial heat (for up to 10 sec) prior to applying the heat pack. The supplied heat pack by itself takes approximately 1 hour to heat the bottle to 100F.

Microwaving will not harm human samples either, but its still not recommended because human urine is a biohazard and should not be in an area where food and utensils are involved.
Last edited by Burnt Toast; Oct-24-2011 at 03:59.