Wetted, softened mix.
new composition.
With very high water content - orange flame, no visible boil zone, the boil zone glows yellowish-red. 30mm sample strand is almost liquid when heated, like a hot petroleum modelling clay, but solidifies to a very hard, glassy substance. (sign of lots of intercrystalline water).
A 30mm strand burned in 7.6 seconds - that would be 6.4 seconds per inch. This is a bit faster than standard J.Y. RCANDY, and I did it with higher water content. This sample was prepared from the BAKE1 - BATCH1 (B1 in text). I took 20 grams of B1, added 1.6g of dextrin.
Back to the yesterday: The mix experiment preparation: 20g of B1, 1.6g dextrin. Added little water, mided by a spoon in a mug. I tried drying in kitchen oven with temp. set to 120°C, but the sample was heated on a paper not with hot air but by radiation from below, so overheating is more than likely since the paper it was drying on got yellow around the mix. The mix itself bubbled and foamed, and was something between softie and crispy, and rather crisp after cooling (but still compressible without crumbling all over!). Burn rate after baking? Enormous. I hammered some of it together in form of a 3x3cm patch (~1x1 inch) and lighed on a side. After catching fire on the paper (~0.5s) it burned whole in ~0.3-0.4 seconds in a large plum of standard smoke. As the smoke plume raised to the sky it looked like a nuclear blast mushroom.
* Some sugar modification is likely to have taken place in the oven because the mix is higly hygroscopic, it went all wet and marmelade-like in one day being left in open air in a room.
Today: However I put in on a iron, set to "** WOOL" and dried it somewhat after long time to get the result mentioned in the beginning. One note: it doesn't have a texture. It resembles clay with some dirt in it.
Temperatures in the heated soft mix:
145°C on the bottom near the iron
130°C in the middle of the mix
108°C 1mm under the top (still very formable like a paste)
I will have my camera again in two weeks so only cameraless tests for now.
Did I mention the dextrin molecule absorbs moisture very effectively? The dextrin is used as a glue for post stamps and such. It has a characteristic smell, etc. See the wiki entry. DEXTRIN
Moderate results after careless redrying:
* The next test strand is 7mm thick and one inch long. The burn speed slowed down to 7.5 seconds and left a carbon residue in the middle. Probably a result of bad mixing together with the overdrying.
* I used another smaller piece of what has left (3mm dia, 1cm lenght) to check the flame size - it is 5cm long now. (2") Unequality of this last small chunk of the mix becomes apparent.
* I made thinner strand of the last remaining stuff, one inch long, 5mm thick. After two seconds it started burning faster and louser. The flame lenght was 7-9cm (2.7"-3.5") and the 1 inch burn time was 6.7s
Second experiment today:
In a similar wetty plastic mix I made with similar method as above the test strand from material that did not even pass the "snap test" about one inch of the mix burned in 4 seconds. The difference was in preparation:
* I tried to make dextrin-KNO3 mix, but it did not burn well, the flame always went out after a split of a second. The mixture was: 6g dextrin, 9g KNO3 and 0.5g Fe2O3. Added water and boiled, etc. The problem was: bad burn - I think the dextrin initially generates too much gas and prevents the rest of the mix from being heated.
* When I saw it does not burn, I put there about two to theree teaspoons of B1 and poured with water (10-20 grams of B1 perharps?). Again boiled and got it to a mushy state and sampled... when too wet the flame went out the same as with totally dry dextrin mix. But as it got drier it became very serious. I made few test strands of approximate lenght and all burns were very intensive. As mentioned above a ~1" long sample (umm, honestly, it was closer to 3cm) burned in about four seconds, the diameter was ~7mm. Mechanical properties when dry: stronger than sugar candy.
* As I tried to scrape the remains of the overdried mix from the steel pan - it was very hard so I was chiseling it out with a knife - I got only chips of ~8mm in size, I collected it and made a small pile. After catching fire the pile burned with speed similar to flashpowder, quickly generating plum od smoke rising to the sky.
***waiting for my camera to come back...
With very high water content - orange flame, no visible boil zone, the boil zone glows yellowish-red. 30mm sample strand is almost liquid when heated, like a hot petroleum modelling clay, but solidifies to a very hard, glassy substance. (sign of lots of intercrystalline water).
A 30mm strand burned in 7.6 seconds - that would be 6.4 seconds per inch. This is a bit faster than standard J.Y. RCANDY, and I did it with higher water content. This sample was prepared from the BAKE1 - BATCH1 (B1 in text). I took 20 grams of B1, added 1.6g of dextrin.
Back to the yesterday: The mix experiment preparation: 20g of B1, 1.6g dextrin. Added little water, mided by a spoon in a mug. I tried drying in kitchen oven with temp. set to 120°C, but the sample was heated on a paper not with hot air but by radiation from below, so overheating is more than likely since the paper it was drying on got yellow around the mix. The mix itself bubbled and foamed, and was something between softie and crispy, and rather crisp after cooling (but still compressible without crumbling all over!). Burn rate after baking? Enormous. I hammered some of it together in form of a 3x3cm patch (~1x1 inch) and lighed on a side. After catching fire on the paper (~0.5s) it burned whole in ~0.3-0.4 seconds in a large plum of standard smoke. As the smoke plume raised to the sky it looked like a nuclear blast mushroom.
* Some sugar modification is likely to have taken place in the oven because the mix is higly hygroscopic, it went all wet and marmelade-like in one day being left in open air in a room.
Today: However I put in on a iron, set to "** WOOL" and dried it somewhat after long time to get the result mentioned in the beginning. One note: it doesn't have a texture. It resembles clay with some dirt in it.
Temperatures in the heated soft mix:
145°C on the bottom near the iron
130°C in the middle of the mix
108°C 1mm under the top (still very formable like a paste)
I will have my camera again in two weeks so only cameraless tests for now.
Did I mention the dextrin molecule absorbs moisture very effectively? The dextrin is used as a glue for post stamps and such. It has a characteristic smell, etc. See the wiki entry. DEXTRIN
Moderate results after careless redrying:
* The next test strand is 7mm thick and one inch long. The burn speed slowed down to 7.5 seconds and left a carbon residue in the middle. Probably a result of bad mixing together with the overdrying.
* I used another smaller piece of what has left (3mm dia, 1cm lenght) to check the flame size - it is 5cm long now. (2") Unequality of this last small chunk of the mix becomes apparent.
* I made thinner strand of the last remaining stuff, one inch long, 5mm thick. After two seconds it started burning faster and louser. The flame lenght was 7-9cm (2.7"-3.5") and the 1 inch burn time was 6.7s
Second experiment today:
In a similar wetty plastic mix I made with similar method as above the test strand from material that did not even pass the "snap test" about one inch of the mix burned in 4 seconds. The difference was in preparation:
* I tried to make dextrin-KNO3 mix, but it did not burn well, the flame always went out after a split of a second. The mixture was: 6g dextrin, 9g KNO3 and 0.5g Fe2O3. Added water and boiled, etc. The problem was: bad burn - I think the dextrin initially generates too much gas and prevents the rest of the mix from being heated.
* When I saw it does not burn, I put there about two to theree teaspoons of B1 and poured with water (10-20 grams of B1 perharps?). Again boiled and got it to a mushy state and sampled... when too wet the flame went out the same as with totally dry dextrin mix. But as it got drier it became very serious. I made few test strands of approximate lenght and all burns were very intensive. As mentioned above a ~1" long sample (umm, honestly, it was closer to 3cm) burned in about four seconds, the diameter was ~7mm. Mechanical properties when dry: stronger than sugar candy.
* As I tried to scrape the remains of the overdried mix from the steel pan - it was very hard so I was chiseling it out with a knife - I got only chips of ~8mm in size, I collected it and made a small pile. After catching fire the pile burned with speed similar to flashpowder, quickly generating plum od smoke rising to the sky.
***waiting for my camera to come back...
posted by Mario. at
7:36 PM
0 Comments:
Post a Comment
Subscribe to Post Comments [Atom]
<< Home