Heat-resistant silicone sealant and heat-reflecting tape (adhesive tape)

A short overview of silicone sealant that can withstand high temperatures, and along the way - self-adhesive heat-reflecting tape.
In short - the sealant is normal, but I did not understand the tape
References:
- red sealant
- blue sealant (more expensive than red and black)

- black sealant
- self-adhesive tape
I have a soldering oven made from a largeroster. The alteration consisted in basalt wool insulation of the side and top faces inside the case and the electricians were remade to work from the PC410 temperature controller via a solid-state relay (I took this set - www.aliexpress.com/item/Digital-Adjustable-PID-Temperature-Controller-Panel-Thermostat-PC410-REX-C100-Max-40A-SSR-Relay-K-Thermocouple/32654958305.html ) However, after the alteration, some drawbacks remained - large gaps between the door and the walls in the closed state and the inability to properly insulate the lower and rear walls - the oven box is closed by the outer casing only on the top and sides, the lower and rear walls of the oven are also the outer walls of the casing.
To solve the problem of cracks, I decided to purchasethis sealant. According to the description in the store, I did not understand what the difference is between these three lots (except for color), so I ordered all three
Exterior: All three tubes came in a plain gray bag, wrapped inside with foamed polyethylene. Each tube in its box. All inscriptions except the name in Chinese:



On the one hand it is written (by translator):
Tips: Guandgong Hengda New Material Technology Co., Ltd. is a renowned professional manufacturer of environmentally friendly adhesives and sealants. He strives to provide bonding and sealing for all walks of life.
The main products are: Acrylate AB modified adhesive series, cell-free (UV) adhesive series, organic silicone adhesive and potted series, anaerobic flat sealant series, thread adhesive series, adhesive series for cylindrical holders, instant adhesive series, metal reagent series, casting adhesive and metal plastic steel rod, etc.
Detailed information can be found on our website: www.kafuter.cn
On the other hand:
Using:
Used when sealing cars,motorcycles, internal combustion engines, compressors, pumps, machines and electronic chemical equipment. It can replace all types of rubber, cork, asbestos, fiber, cardboard, felt fabric and other gaskets, oil, water, steam and antifreeze, temperature resistance -60 - +280 degrees Celsius, pressure 12 MPa, the use of technology:
1. Clean and dry the surface to be bonded.
2. Apply glue to one of the surfaces in a continuous apron.
3. After approximately 5-10 minutes, the two joints are brought into close contact and assembled.
4. Fully cure after 24 hours.
Be careful that children do not touch! If you accidentally touch your eyes, rinse immediately with water. Validity: 12 months. Net Content: 55g
Translator spelling saved
Information on the application is duplicated on black and blue tubes, also in Chinese:

And in red - a general description in English:

The tubes are not initially sealed, that is, they are notneed to pierce the foil on the nose. There is a cylindrical protrusion in the cap, which fits quite tightly into the nose, and, apparently, it serves as additional protection against solidification:

Character In general, it is understood that this silicone is designed to be used as a “liquid gasket,” that is, a thin layer between adjacent surfaces.
Black and blue colors are very saturated, blue is bright. But red - rather red-brown, brick color.

The consistency is very thick. I don’t even know what to compare. Maybe with boiled condensed milk

If the fresh sealant touches something, then the trace will remain, it will not blur.
It has a rather pungent odor similar to the smell of rubber and something else. If you use it indoors - it is advisable to ventilate it until the sealant hardens completely.
First I tested it and found out the following:
- about 1 mm of the outer open layer hardens per day
- between two plastic films curing is much slower
- moisture and temperature do not affect the solidification process in any way (at least they do not significantly affect)
- perfectly clings to glass, metals, paint,plastic - you can’t gnaw off teeth. And even very well hooked on wax paper, on which double-sided tape is wound. The adhesion to polyethylene is weak, but also there. It stuck very well to foamed PVC and ordinary adhesive tape, but with some effort it nevertheless moved away.
Work, therefore, he freezes only frominteractions with air. And my initial plan - to glue the walls of the stove with tape, put a sealant on the door, close the glass so that the tape took the desired shape, wait a day until it hardens - failed. Firstly, a layer of about 3 mm will dry much longer than a day, especially considering that the sealant will be sandwiched between the door and the walls. Secondly, it will stick to the tape.
Then I decided to do it differently - to applysealant sausages on the door, wait ... eleven hours to harden the top layer (inside it will still be pasty), then close the door so that it flattenes the resulting shell with a soft sealant inside and leave it in this form for a couple of days.
According to the new plan, everything worked out - caused thicksausages, slightly leveled them with a flat plate, left for 15 hours and then closed and pressed the door with clamps. The result was a tight-fitting seal on the stove door.

All three colors are used to check the heat resistance of all three sealants and if something is wrong with one of them, nibble it and apply the other


Then a hole was printed in the wall, in which, when this device was in use, a silicone stop for the door was fixed with a roster:

The thickness on the sides was about 3 mm (on the ruler it seems less because it is shot a little from above):

To make it more convenient to apply the sealant in a small portion to the bottom of the door, I transferred it to the syringe:

Due to the density of the sealant, I had to suffer with this
As a result, I did not report the sealant to the bottom of the door and there were small gaps:

But they are very small and practically do not affect the heating of the stove.
After hardening, the sealant turns into a fairly hard rubber, elastic, but torn when trying to stretch more than 20-30%.
By temperature - several heating cycles up to 250degrees and keeping this temperature for 3 minutes, the sealant withstood easily and without any consequences. In addition, I tried to crush it with a soldering iron heated to 320 degrees and held the soldering iron for a minute. It also had no visible consequences for the sealant - neither the color nor the structure at the heating point has changed.
Before sealing the door, the stove was heated to 250 degrees in 4 minutes 30 seconds, after sealing, the heating time decreased to 4 minutes exactly. There is a result and it's good
Heat-reflecting tape And a little about heat-reflecting adhesive tape.
The idea to use it was filed in one of myreviews comrade valius - here
The adhesive tape itself has a fiberglass base, on top of it is applied a golden layer of either metal or metallized plastic foil. Bottom - adhesive composition.
Thesis: heat-reflecting tape should reduce the heating of the walls of the stove, accelerate heating inside - by reflecting the IR back into the stove.
Check: measure the temperature of the back wall from the outside (without insulation), measure the heating time to 250 degrees. After the adhesive tape sticker repeat, compare the results.
Unfortunately, a 5-meter skein was enough for me only on the bottom, back and half of the upper wall

And now the test.
Results before adhesive tape sticker: at a temperature inside the stove of 250 degrees, the temperature of the back wall outside is 170-175 degrees, the time for heating the stove from 22 to 250 degrees is 4 minutes exactly.
The results after sticking the adhesive tape: at a temperature inside the oven of 250 degrees, the temperature of the back wall outside is 170-175 degrees, the heating time of the stove from 22 to 250 degrees is 4 minutes exactly.
Bottom line - this heat-reflecting tape doesn’tinfluenced. In general
Pros - adhesive tape in the stove perfectly withstood the sametemperature cycles, as well as sealant - heating to 250 degrees and maintaining this temperature for 3 minutes. It did not peel off, did not change color, the adhesive base did not darken (where it can be seen), even on the upper wall, where this adhesive tape was pasted 1.5 cm from the red-hot red heating element.
Results Sealant: fully consistent with the description.
Pros:
- really keeps the declared temperature
- excellent adhesion to various materials
- consistency allows you to apply it on vertical and even ceiling planes
Minuses:
- stiffens for a long time in a thick layer
I’m not ready to evaluate the heat-reflecting adhesive tape, because, perhaps, I just applied it incorrectly, for other purposes