Making Thermalite

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marvSRG

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There used to be a site that told how to make thermalite...anyone know where I can find info on this? If you consider this too "EXy" that's fine. I understand. It was just a question I had on my mind.

Thanks
 

MarkABrown

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I remember seeing that site once before. Unfortunately, I don't have a link to it anymore.
 

hokkyokusei

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Could someone explain to me what thermalite is, and what it's used for? I don't think I've ever seen it here in the UK.
 

Silverleaf

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Thermalite - A material, originally used to detonate plastic explosive, which burns at a controlled rate and high temperature. Used with rocket motors as an ignition enhancement. It can be ignited by electric (nichrome) means, flash bulbs or the exhaust of a previously started motor. It comes in three burning speeds color coded as pink (slow), green (medium) and white (fast). For a rough order of magnitude, slow is around 1/2 in/sec and fast is 2 1/2 in/sec in free air, but this can be affected by temperature, humidity, pressure and whether or not the fuse is sheathed in a tube.

In addition, its a low-explosive device in the shape of narrow string, similar to detonation cord. Thermalite is often used to enhance the efficiency of igniters in large-diameter composite motors, and is sometimes used for airstarting motors. The possession and use of Thermalite now requires a LEUP to be issued from the BATF.

Hope that helps,
 

hokkyokusei

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Originally posted by Silverleaf
In addition, its a low-explosive device in the shape of narrow string, similar to detonation cord. Thermalite is often used to enhance the efficiency of igniters in large-diameter composite motors, and is sometimes used for airstarting motors. The possession and use of Thermalite now requires a LEUP to be issued from the BATF.
Is it like visco?
 

marvSRG

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Elbmod,
Yep, that's it! Thanks a bunch. I wanted to check it out again....

hokkyokusei,

The only similarity to visco is the fact that it's fuse. Thermalite burns much hotter, and can be time controlled, also when sheathed with heat-shrink tubing it burns almost instantly. It works great for ignition, staging, and airstarts. But unfortunately, as with almost everything these days, it's regulated by the BATF:(
 

JoJo

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Originally posted by Silverleaf
Thermalite - A material, originally used to detonate plastic explosive, which burns at a controlled rate and high temperature. Used with rocket motors as an ignition enhancement. It can be ignited by electric (nichrome) means, flash bulbs or the exhaust of a previously started motor. It comes in three burning speeds color coded as pink (slow), green (medium) and white (fast). For a rough order of magnitude, slow is around 1/2 in/sec and fast is 2 1/2 in/sec in free air, but this can be affected by temperature, humidity, pressure and whether or not the fuse is sheathed in a tube.

In addition, its a low-explosive device in the shape of narrow string, similar to detonation cord. Thermalite is often used to enhance the efficiency of igniters in large-diameter composite motors, and is sometimes used for airstarting motors. The possession and use of Thermalite now requires a LEUP to be issued from the BATF.

Hope that helps,
wow so i could get some plastic explosive and any model rocket ignigter and blow up whatever i wanted to....scary thought:D
 

hokkyokusei

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Originally posted by marvSRG

The only similarity to visco is the fact that it's fuse. Thermalite burns much hotter, and can be time controlled, also when sheathed with heat-shrink tubing it burns almost instantly. It works great for ignition, staging, and airstarts. But unfortunately, as with almost everything these days, it's regulated by the BATF:(
From what I see in the link, I don't think I've ever seen thermalite in the UK. I've seen some other stuff used for fairly similar purposes - such as ensuring ignition, but that's quite different. It is approx 2mm in diameter, brown, covered in a yellow/green plastic with what appears to be a very thin wire down the centre.
Not sure what it's real name is, everyone seems to refer to it as "slow". As in the opposite of "quickmatch".
 

Lee Reep

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Originally posted by marvSRG
There used to be a site that told how to make thermalite...anyone know where I can find info on this? If you consider this too "EXy" that's fine. I understand. It was just a question I had on my mind.

Thanks
If you are looking to make igniters, try FireFox in Idaho. Their Liquid Element is great. You dip fine gauge wire (I use pairs from CAT5 cable) into it, and it ignites black powder motors just fine. Liquid Element is conductive, so you do not need a nichrome bridge wire for lighting it. It glows a little, with a few sparks, much like Estes ingniters.

For composites, you can redip in another pyrogen, like their PyroMax. These produce a white hot ball of fire that will ignite anything.
 

ksaves2

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Blackleaf99

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I realize this is an old thread, but here is something.

The Encyclopedic Dictionary of Pyrotechnics, Issue 34 lists the following

Thermalite™ – A type of igniter cord formerly manufactured by Canadian Safety Fuse.
 

cwbullet

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If you are looking to make igniters, try FireFox in Idaho. Their Liquid Element is great. You dip fine gauge wire (I use pairs from CAT5 cable) into it, and it ignites black powder motors just fine. Liquid Element is conductive, so you do not need a nichrome bridge wire for lighting it. It glows a little, with a few sparks, much like Estes ingniters.

For composites, you can redip in another pyrogen, like their PyroMax. These produce a white hot ball of fire that will ignite anything.

If they are still in business. Anyone confirm a recent order?
 

djs

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Don't diaper the solids.
I'm not Kurt, but I think he was trying to say "don't dry mix the solids" and his autocorrect changed it to diaper. Unless he's got a very unusual mixing process :)
 

rharshberger

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I'm not Kurt, but I think he was trying to say "don't dry mix the solids" and his autocorrect changed it to diaper. Unless he's got a very unusual mixing process :)
Diapering is a mixing process, the materials are placed in the middle of the sheet and then corners are alternately picked up to roll the products together very gently.

https://pyrodata.com/definitions/Diaper-method
 

ksaves2

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I spit out the term verbatim. I think the Pyro people use it but yes dry mixing the fuel and oxidizers like Pyro people do is an
unnecessary risk when making a pyrogen dip. The pyro folks who deal with dry powders will stick it in a casing, stuff in a mandrel and either use a press or a freaking hammer to compress the dry mix. I don't have cojones to do that and those that do have my respect for knowing what they can get away with.

My mother never let my brother and I have the "ashcan kits" by mail (spell that M-80's) but did allow us to make Roman Candles and smoke bombs from kits. I remember "diapering" the "fixings" and mashing them in the Industrial casings for 6 minute smoke bombs using a dowel rod and tamping the blowing and delay powder for the stars for the Roman Candles. She probably saved me and my bro from injuring ourselves.
 

prfesser

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I spit out the term verbatim. I think the Pyro people use it but yes dry mixing the fuel and oxidizers like Pyro people do is an
unnecessary risk when making a pyrogen dip. The pyro folks who deal with dry powders will stick it in a casing, stuff in a mandrel and either use a press or a freaking hammer to compress the dry mix. I don't have cojones to do that and those that do have my respect for knowing what they can get away with.

My mother never let my brother and I have the "ashcan kits" by mail (spell that M-80's) but did allow us to make Roman Candles and smoke bombs from kits. I remember "diapering" the "fixings" and mashing them in the Industrial casings for 6 minute smoke bombs using a dowel rod and tamping the blowing and delay powder for the stars for the Roman Candles. She probably saved me and my bro from injuring ourselves.
Each pyro mixture has its own ignition hazards. For example, BP is highly spark/flame sensitive but is largely insensitive to impact and pressure, which is why centuries of BP rocket makers lived to tell the tale. It's also why BP can be ball-milled. Diapering is the way that smart pyros make "ashcan" flash and/or whistle mix; both are sensitive to flame and impact. Whistle rockets are always pressed, never rammed. Armstrong's mixture is sensitive to being looked at cross-eyed. ;-)

Best -- Terry
 

warnerr

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Re firefox-fx.com - got my order a few months ago... it was not smooth or quick despite being on file and ordering in past. took greater than a month to ship. My answer to are they still in business is ‘barely’. Hopefully your order went better than mine as they are a great source of metals and Nitocelliose.
 
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