Paul, when I was a shotfirer we had blast mats that performed a similar function to the EOD blankets you describe. We used them to prevent flyrock from surface or shallow sub-surface charges, and to protect vulnerable objects near blast sites. They could certainly withstand the effects of detonating small charges in direct contact.
Ours were made from cut sections of worn out steel radial belted tyres, stitched together with heavy gauge wire. Cheap and easy to put together but due to their weight not as portable as the ones you mentioned and ours wouldn't have been as fire resistant either.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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