DIY "Starlite" to fireproof/insulate reloading/shooting equipment and components

Most of my pistols have polymer parts that I wish to protect from potential house fire temperatures. And most of my reloading components (bullets, primers, powder and even brass) could be damaged by house fire heat that could reach 1700°F. While fire safes provide limited time protection from temperatures of a house fire, thought of inside fire safe reaching 350+°F is not comforting to me.

Then I came across a video of compound that supposedly mimics insulating qualities of "Starlite" developed by Maurice Ward in the 70s-80s to withstand laser heat of 10,000°C (18,032°F) - https://en.wikipedia.org/wiki/Starlite



Youtuber NightHawkInLight starts the video with a thin disk of his reproduction "Starlite" (Size and thickness of a corn tortilla) protecting his hand/fingers from the heat of a propane torch. I am curious whether 1/4" to 1/2" thickness of this material is enough to protect the contents (polymer pistol parts and reloading components) from the heat of house fire (Up to 1700°F).

At 3:20 minute mark of video, he shows the ingredients of corn starch, baking soda and white glue.

Some commenters posted Heat Blocking Putty used by welders is similar to "Starlite" - https://www.amazon.com/Refrigeration-Technologies-RT400P-Wetrag-Blocking/dp/B017T23T18

Meting zinc core copper pennies on "reproduction" Starlite with Bernzomatic TS8000 (Flame temperature 2000°C / 3632°F).

Melting point of zinc = 419.5°C / 787.2°F

SCC said:

The problems I see are its inability to survive mechanical stress in both cold and heated states.

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That was my concern too.

Since my reloading room is located inside the house and I live in Northwest coast with annual temperature range of 40s to 60s, freezing is not a concern.

Since I can weld, I thought about fabricating a double walled box/container to hold 1/2" thick insulating reproduction "Safelite" compound. Another idea was to re-purpose a non-working upright/deep freezer and replacing the insulation with reproduction "Safelite" compound but I would need to work out the door seal/gap area with easy melting material to allow the reproduction "Safelite" compound to seal in case of house fire (How Sentry fire

SCC said:

I've seen the videos on this material and it's interesting.

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Yes, very interesting indeed.

BTW, I have the large Sentry fireproof safe shown in this video to keep my polymer pistols inside gun safe. At 2:00 minute mark of video, 1000°F fire was sustained for 30 minutes and plastic DVD case in large Sentry safe was not affected but smaller Sentry safe did. I am thinking 1/2" of reproduction "Safelite" compound would do a much better job (provided I fashion a workable seal for opening).