Introduction: Fuse

Picture of Fuse


This instructable describes how to build a simple fuser to quickly and efficently make hundreds of feet of pyrotechnic fuse. It requires very basic materials and construction skills, and the entire process only takes a matter of hours to get hundreds of feet of fuse.
I would like to give credit to both united nuclear and pyro universe, because this design improves on and modifies both of their ideas and techniques. This project will have much use in my other projects requiring fuse, and as every pyrotechnic knows you can never have enough fuse.

This fuse burns at appx. 1 in. / sec

Step 1: Parts List

Picture of Parts List

The parts for this project should be relatively cheap because most of the items can probably be found around your house. The black powder (gunpowder) is the only thing you might have a problem getting your hands on, but it shouldent be too hard if you know where to look.


1. Old tupperware container (medium sized)
2. Black powder (Can either be bought at gun stores, with proper id, or made in my tutorial )
3. 1/4" Wooden dowel at least 2 feet in length
4. Dextrin, A powdered pyrotechnic glue (Can either be bought on e-bay, or made, Ive never made it but the good folks at pyro universe say "To make dextrin, spread an entire box of corn starch out on a cookie sheet and cook it in the oven at 400° for about 2 hours, stirring it every 20 minutes or so with a spatula to keep it from burning. When it's done, it will be light yellow/gold in color.")
5. Scale
6. Rubbing Alcohol
7. Devcon weldit all purpose glue
8. 1/4" and assorted smaller drill bits and a drill
9. Old clothes (or some type of overcoat), latex gloves, and eye protection (Optional)(This project is messy)
10. (2) Spools of cotton twine, make sure it has nothing else in it wax, etc. (to do this take a sample 3 in. piece of it and burn it, if it contains wax or something else it will drip, if it dose not drip when burned it is good)
11. Old scrap wood, a 3 foot long 2x4 would be good enough
12. Saw
13. Hammer and nails

Step 2: Building the Fuser

Picture of Building the Fuser

This project uses the fuser to hold the 2 spools, coat the strings with black powder, and combine them to form a fuse. The steps do not need to be followed exactly, as long as you end up with something that looks like what is in the picture, and its sturdy, it will work.


1. Take the scrap wood and cut it so you have a one piece about a foot in length, and another about 7" in length.
2. Hammer the 7 in piece perpendicularly on top of the foot long piece with 3 nails. (Refer to the photos because they will probably help more then my worded instructions)
3. Drill (2) 1/4" holes through the 7" piece of wood a few inches from the center. However, do not drill all the way through the wood, drill 3/4ths of the way down, the dowels will be sturdier this way.
4. Cut the dowel into three segments, 2 of those segments will be the same lenght and should be at least 4 inches long (to hold the cotton spools) The third segment will be inserted in the tupperware container (To hold the cotton string under the gunpowder)
5. Drip some weldit glue (wood glue could be used instead here) into each of the 2 holes and on the bases of the 2 equally lengthed dowel segments, then push each segment into their holes (if you cant push them in all the way try using a rubber mallet to gently hammer them farther in)
6. Use the 1/4" drill bit to drill 2 holes in the tupperware container. These holes should be no more then a two centimeters from the bottom and on exact opposite sides of the container. A method I used was I drilled a hole on one side, then pushed the 3rd segment of dowel into the container. I then marked off the other side where the dowel hit, and then drilled through there. Push the dowel through the second hole and seal off around both holes with the all purpose glue (Both of the holes need to be waterproof)
7. Take this container and line it up on the foot long piece of wood so that the dowel running through it is parallel to the 7 in. piece. Take a magic marker and dot off two holes near the top of the container (this is where the cotton string from each separate spool will enter), and mark one hole on the exact opposite of the container (this is where the fuse will exit).
8. Find a drill bit about the size of a piece of string and use it to drill through the 2 marker dots on the side where the cotton string will enter. Take a drill bit the next size up from the one you just used, and drill one hole on the other side of the container where you marked off. The hole where the fuse will exit is the important one, if it is too big then it will not clean and even off the fuse, and if it is too small it will not be big enough to fit 2 strings through it.
9. Using the weldit glue fix the tupperware container at the end of the 2x4, so the two holes face the side where the cotton spools will go. Wait for it to dry and you are finished.

Step 3: Preparing the Fuser and the Place to Hang the Fuse

Picture of Preparing the Fuser and the Place to Hang the Fuse

I strongly advise you to do this outdoors on a nice sunny day. However, it was very damp and rainy the day I took these photos so I set up the rig in my basement, and it would be hypocritical for me to tell people not to do this. So instead I will give a WARNING, IF YOU MUST DO THIS INDOORS MAKE SURE THERE IS NO SOURCE OF IGNITION ANYWHERE NEAR THE DRYING FUSE, also its very messy so be prepared for to clean up if you do it indoors.
With that being said its time for preparation.
If you do this outdoors the only thing you will need is somewhere to hang the string, the best method uses a clothes line and clothes pins to hold the string on it, however you can also wrap it around fence posts or even trees ( just remember that it will leave marks so if you have a nice white fence I wouldent advise wrapping fuse around it)
If you do this indoors you will need 2 or more surfaces to "web" the fuse back and fourth between. I used a tv tray holder and one of the support posts to the main house crossbeam in my basement.
I covered the surfaces that would come in contact with the fuse in the brown paper used to wrap school books, you could use bags, old newspapers, etc. I then taped them with electrical tape to hold the paper on.
Cover the area underneath where the fuse will hang with newspapers or paper towels because it will drip.

To set up the fuser put the 2 spools of cotton string on the 2 dowels, feed the strings through each of their holes, underneath the horozintal dowel in the tupperware, and out the exit hole. Once the strings are out of the tupperware container tie them together with a small knot. You are now ready to mix the chemicals.

Step 4: Mixing the Black Powder Paste

Picture of Mixing the Black Powder Paste

You can do this in either a separate container and pour it in, or just do this in the container with the string. I prefer a separate container because it is easier to stir and get to a smoother consistency, which results in a higher quality fuse.
For each batch I make I use about 90 grams of black powder and 9 grams of dextrin. You can increase or decrease this amount as needed, just remember for every 10 grams of black powder use 1 gram of dextrin.
To make the liquid solution mix 1 tablespoon rubbing alcohol and 3 tablespoons warm water in a separate cup. Mix the contents of the cup and then slowly pour it into the container with the black powder and dexetrin. You will probably not use all of the liquid in the cup, so pour slowly and stop every few seconds to stir the mixture. Once the consistency is similar to white glue stop adding the water/alcohol mix. Before you pour this mixture into the rig, take the string coming out of the front of the container and tie it to one of the supports you choose to "web" the fuse from.
If you havent already put on your latex gloves and dirty clothes. Pour the mixture into the tupperware with the string and go to the next step.

Step 5: "Webbing" the Fuse

Picture of "Webbing" the Fuse

So now you should have the string tied off to one of the posts, have the tupperware container filled with a black goo, and be ready to start making fuse.


1. Walk slowly (with the fuser in your hands) from the post where you tied off the string (As you can see in the picture I put a tool box on the feet of the tv tray holder so it dosent tip over), to the other post, making sure that all the string is completely coated with the black sludge. Also make sure that the two strings are sticking together when they exit the tupperware, if not run your fingers over them trying to press them together again. If they still do not stick then you probably did not add enough dextrin to your mix and you should stir some more into it.
2. Wrap the fuse around the post, as shown in the pictures, and walk back to the other post. If the fuse starts to fall from the post use some tape to hold it up.

Repeat those steps until you either run out of either string, black powder paste, or room to hang more fuse.
When you are finished cut the string from where it is attaches to the spools and pull the remaining string through the fuser. Take the end of the fuse and tie a knot it, and then tie it to one of your posts.
As you can see in the picture use a piece of paper towel to separate 2 sections of fuse if they are touching otherwise when they dry they will be stuck together. Give it 24 hours to dry, longer if it is humid.

Step 6: Cutting and Storing the Fuse, and Clean Up

Picture of Cutting and Storing the Fuse, and Clean Up

Once the fuse is dried you should probably cut it, cutting it into 8 in. segments makes it easy to store and convenient to use. You can either cut it while it is still hanging, or take it down and cut it, whichever is easier. Not all of the fuse is going to be perfect so you will have to inspect it as you go along making sure to cut out any parts that arent coated enough, or where the strings didnt stay stuck together.
Once you have the 8 inch segments you can store them in a plastic ziplock bag for future use. Make sure the bag is airtight though so the fuse dosent absorb any moisture from the air.
When you are done making your fuse you should be left with a bunch of paper with black dots of gunpowder on it. The safest way to dispose of this is probably by crumbling everything up into a big ball and stuffing it in a plastic food shopping bag, taking it outside, soaking it with your hose, and then throwing it in the garbage. (Or if you have a fireplace I suppose you could burn stuff a little at a time)

As you can see in the photo those paper towels sacraficed themselves for the greater good of protecting my town map rug... I dont know what I would do without that rug.


Gnomie. (author)2014-11-23

also looking at a few of the other comments I think I will add a better description of how to make potassium nitrate which either by itself or combined with the black powder would make a smoother burn and able to burn trough tight spaces. Simply put take NaNo3 (sodium nitrate) which is a food preservative and very easy to obtain, and KCl (Potassium Chloride) is aqueous solutions. Just type that into google and you will find many ways to make Potassium Nitrate, or you can buy it.

Gnomie. (author)2014-11-23

if you then soaked the fuse in paraffin wax it would be water proof, unless it already is but I doubt it. Once soaked in wax you wouldn't have to worry about moisture in the air degrading the fuse and it should still burn at approximately the same rate. Excellent instructions

Captain Patchwork (author)2014-10-18

Haven't tried this before, would these fuses be rigid? Trying to do a set up that requires me to tie a bunch of fuses together.

jweinstein jr (author)2013-08-26

I know I'm late to the party and all, but if you start with a finer string coat it with your formula an then weave the string into a cord you will have a much better burn in tighter areas.

jsobieralski (author)2011-07-07

I always wander a rug like that! My step-brother had one and I was always so jealous.
But aside from that, nice instructable, very enjoyable.

oldmanbeefjerky (author)2010-12-09

i want to know how well this fuse burns, aka, can it burn in the total absence of external oxygen?
such an environment may be found in the highly confined hole that a fuse must burn through to reach the insideds of a firecracker

also, have you ever just used potassium nitrate for the fuse, with dextrin? and if so , what are portions you should add inorder to aquire a a fuse that is capable of supplying its own oxygen source for burning.

so far i have not been able to make a fuse, other than with matches ( with the fuse being about as dense as the actual match heads due to the large amounts of match powder used), that could burn through confined holes, and thus have wasted alot of precious resorces in making these fail matches.

ZeroBurn (author)oldmanbeefjerky2011-06-25


This might be helpfull to more people than just you, but you are the only one asking this question it seems.

Most (If not all fuses) covered here and in anarchy cook books follow this or similar method. The problem with these methods is that it just burns on the surace, thus when pushing it trough a tight hole, burning will stop at the hole. The two strings twisted together is about as close to a solve I have seen...

The method I use is simple:

Get some rice paper and cut to length if you prefere, but keep it a few centimeters wide (An inch or two wide).. Now coat the ONE SIDE with the blackpowder-water mixture as mixed in this instructable (it works) and roll the rice paper up as tightly as you can keeping the blackpowder in the inside of the roll (Much like roling a joint)...

Now coat the exterior with the blackpowder mix aswell if you deem it necessary. Hang to dry..

You can also use that thin material used to cover up wounds before a bandage is applied. Just remember to use a single layer, this seem to work the best.

Hope this helps some of you folks. Cherz

oldmanbeefjerky (author)ZeroBurn2011-06-25

sir if this was a question, you would have gotten the best answer!

i cant believe i overlooked that!

gameboy7oa (author)2007-11-02

hehehehhehehehhe i took gunpowder from some bullets and mixed it all up im a bottle cap (with match heads so it lights easier) but i mixed it with waser so i was woundering if it will still light?

Finker (author)gameboy7oa2011-06-06

If you let the mix dry, yes.

themasterpyro (author)gameboy7oa2007-11-06

once the water is gone yes. and which type of bullet did you take the powder from? this is important information so i can tell if it will work in a way which will allow you to keep all your fingers.

gameboy7oa (author)themasterpyro2007-11-07

lol yes I do still have all nine(jk I have 10) of my figures on my hands. I used 22 long rifle bullets the same kind I'm going to use for one of my Instructables.

themasterpyro (author)gameboy7oa2007-11-07

thats it? im using a WHOLE m1 garand clip of blank 30.06 rounds. and the primers are still unused.

gameboy7oa (author)themasterpyro2007-11-08

yah but all i had lying around were the 22s so thats what i have to deal with maby ill be adle to get something stronger when im not 13

themasterpyro (author)gameboy7oa2007-11-08

look foward to 21.(or if parents will let you 16 ish) soon parents are going to let me get a mosin nagan and theyl sign the part of the application forum which will allow me to get my own FOID.

gameboy7oa (author)themasterpyro2007-11-08

yah so now i just have to count down the days 2682 days 64371 hours 3862307 minutes 231738462 seconds

themasterpyro (author)gameboy7oa2007-11-09

why do i have the feeling that mist of those numbers are random? (dont answer that)

gameboy7oa (author)themasterpyro2007-11-09

um actualy I used a count down generator so it actualy is correct numbers from the time I posted the comment

keastes (author)gameboy7oa2008-03-06

don't tell me youvve never heard of the the anarchist cookbook! what kind of stupid teen are you!?!? i've had a copy under my pillow scence i was twelve (ok it was a print out) that was five years ago.

anywho, explosives galore

lug big lug (author)keastes2011-02-13

Hey, so do I!!!!! but i have made my own and added it to the original so it is over 700 pages long... (I keep it on a flashdrive)

themasterpyro (author)gameboy7oa2007-11-09



A.C.E. (author)themasterpyro2008-12-18

mosin nagan... that would be a sick hunting rifle if im thinking of the same gun, the sniper rifel from call of duty 5 (or 4 i cant remember) but what's a FOID?

daltondude (author)A.C.E.2009-06-30

its a card that u have to have to buy guns and ammo from a legitamate arms dealer, i think it stand for firearms owner identifacation

mortso (author)gameboy7oa2009-06-13

Removing the bullets from .22 shells is hella dangerous. The Rim Fire primers can be triggered by compression, like if you had the shell in Pliers or a vise. Just make Black Powder it's safer.

striker95 (author)2009-03-21

can any one tell me where I can find a print out version of the anarchist cookbook?

lug big lug (author)striker952011-02-13

Nowadays, most people get it online and print it out or just use it on a computer.....

franzzwolensky (author)2010-08-30

Why are two strings required? Can one string with loose fibers absorb the mixture and the mixture then squeezed into the fibers as it is drawn out of the hole? Can the fuse be made flexible so that it can be wound onto a spool? Your response is appreciated.

CamWaite (author)2010-06-02


YoungPyro19 (author)2010-05-22

Hey, I remember that rug when I was like what, in the 3rd grade. lol
Nice =)

Mad Cat (author)2010-05-06

 Could I substitute black powder for flash powder (by slowing it down) or sparkler powder?

paultorres (author)2010-03-01

i am looking for a visco machine to make a fuse but i like your fuse i will like to make a visco machine post me a comment

sas223 (author)2009-12-21

can you use pyrodex ? thx in advance 

mettaurlover (author)2009-12-12

I have a rug like that!

Mig Welder (author)2009-11-23

oo is that the wintergreen rubbing alcohol?? lol it smells kinda wierd

Mig Welder (author)2009-11-22

out of curiosity, why do the strings have to stick together? is it a kind of test to see if it has enough dextrin or is it neccessary?

MickLionheart (author)2007-06-19

Nice Carpet :), i remember that in my room when i was around 4 years old.

Craftibles (author)MickLionheart2009-10-24
That's  Tetranitrate's room? Lies!
Mattrox (author)2009-09-10

Adding red phosphorus make blackmatch (This type of fuse) work nicer but I think it might make them a bit more dangerous

bad ass pope (author)2009-06-29

I have that rug in plastic form, it'd be so much cooler in carpet... I used to crash cars into the shop window and then send a convoy of fire trucks and ambulances to rescue the crash victims and destroyed shoppers. Sometimes these incidents happened at the school, resulting in many squashed kids or at the lunatic asylum (the big manor-type thing if I remember correctly). Oh! And I used to combine micro machines with regular sized cars and have chases! There were probably Playmobil people in there sometimes too... I've had many fun times with that mat. I think yours is the same as mine... It's been a few years though.

I_am_Canadian (author)2009-03-31

Ive made Dextrin with that method... It works great!

I_am_Canadian (author)2009-03-31

Can you show a video of it burning?

craig3 (author)2009-03-18

haha oh man, i had the same rug when i was little, AWESOME! i wish i still had mine

recyclebin (author)2009-03-07

I made this stuff and only used a single strand. The only times it doesnt work is if its still damp or if you add to much dextrin(i made my own dextrin and black powder).

mje (author)2007-02-21

This is what pyrotechs call "black match". Fuse has an outer casing. If you put black match in a paper tube, you get "quickmatch", which burns very fast ans is used to things like getting display pieces to light all at once.

Tetranitrate (author)mje2007-02-22

I love quickmatch. I'm going to write an instructable for it as soon as I get a chance. Its good for setting off things like waterfall displays where many different tubes need to be ignited at once for the maximum effect. I love showing quickmatch to people because it is something that most have never seen before. It doesn't get much use outside of professional displays, so its always fun to see someones reaction when a couple hundred feet of fuse burns in only a fraction of a second.

mje (author)Tetranitrate2007-02-22

Here's a fun trick with quickmatch: Tie it off with a piece of string every couple of inches. The pressure will build up in each section and it'll pop as it goes off.

badmagic (author)mje2007-09-11

You can do a better job with det. cord. By making a circle out of det. cord with knots in it at regular intervals, you can remove the tops off of 55 gallon drums. The bigger the knot, the bigger the explosion. Det cord burns between 22000 and 24000 feet per second.

A.C.E. (author)badmagic2008-12-18

wtf det cord burns 24000 feet a second?

badmagic (author)A.C.E.2008-12-20


"As a timing mechanism, detonation cord detonates at a very reliable rate (about 7000 - 8000 m/s), enabling engineers to control the pattern in which charges are detonated."

Sorry. I was wrong. It's between 22,965 to 26,246 feet per second. Faster than I thought.

You ought to check out the vids on YouTube. This stuff is... A M A Z I N G.

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