€16.79
- Withstands temperatures up to 300 degrees
- Bonds and seals while evening out stresses
- For boilers, flue gas boxes and tiled stoves
- Can be used in the vehicle sector as well
- 14 days right of withdrawal
- Expert advice: 02831 9167703 Mon–Thu 9–16, Fri 9–12 (CET)
- Specialist dealer in Kevelaer, Lower Rhine
Description
Ottoseal S25 high-temperature adhesive for heat-resistant yet stress-compensating bonding and sealing, e.g. on cast-iron sectional boilers, flue gas boxes, tiled stoves and in the vehicle sector. Ottoseal S25 high-temperature adhesive has a temperature resistance of up to + 300 °C.
- Acetate-curing 1K silicone sealant
- Exceptionally high temperature resistance up to + 300 °C
- High bond strength
Areas of application of heat-resistant adhesive:
- High-temperature adhesive for heat-resistant yet stress-compensating bonding and sealing, e.g. on cast-iron sectional boilers, flue gas boxes, tiled stoves etc.
- Also suitable for vehicle applications in engines and gearboxes
Substrates:
The bonding surfaces must be clean, free of grease, dry and sound so that the high-temperature adhesive adheres. The bonding surfaces must be cleaned and any contamination, such as release agents, preservatives, grease, oil, dust, water, old adhesives / sealants and other substances that impair adhesion, must be removed. Cleaning non-porous substrates: clean with OTTO Cleaner T (flash-off time approx. 1 minute) and a clean, lint-free cloth. Cleaning porous substrates: clean surfaces of loose particles mechanically, e.g. with a wire brush or a grinding disc
Application:
Application method: manual caulking gun, compressed-air gun or cordless gun
Application temperature:
+5°C to +40°C (ambient temperature)
+5ºC to +35ºC (bonding surface temperature)
The heat-resistant sealing compound must be completely cured before it is exposed to temperatures above + 50 °C. The high-temperature silicone is not a fire-protection silicone. For this we recommend OTTOSEAL S 94. Because of the many possible influences during processing and application, the applicator must always carry out a trial application. The specific use-by date can be found printed on the container and must be observed. We recommend storing our products in the unopened original containers dry (< 60 % RH) in a temperature range of + 15° C to + 25° C. If the products are stored and/or transported for longer periods (several weeks) at higher temperature/humidity, a reduction in shelf life or a change in material properties cannot be ruled out.
Technical data:
| Skin-forming time at 23 °C/50 % RH [min] | ~ 8 |
| Curing in 24 hrs at 23 °C/50 % RH [mm] | ~ 2 |
| Application temperature from/to [°C] | + 5 / + 40 |
| Viscosity at 23 °C | paste-like, non-sag |
| Density at 23 °C to ISO 1183-1 [g/cm³] | ~ 1.2 |
| Shore A hardness to ISO 868 | ~ 30 |
| Tensile stress at 100 % elongation to ISO 37, S3A [N/mm²] | ~ 0.9 |
| Elongation at break to ISO 37, S3A [%] | ~ 300 |
| Tensile strength to ISO 37, S3A [N/mm²] | ~ 2.5 |
| Temperature resistance from/to [°C] | - 40 / + 300 |
| Storage stability at 23 °C/50 % RH for cartridge/bag [months] | 12 |
Storage:
12 months from the date of production in unopened packaging, stored cool (+5ºC and +25ºC) and dry . Close opened containers tightly and use up quickly.
Colour:
red-brown
Supplied as:
310ml cartridge
Technical data
| Material: | Silicone |
|---|
| Technical data | |
|---|---|
| Product group: | High-temperature & fire protection silicone |
| Use | |
| Merchandise group: | Sealants |
| Application | |
| Application temperature: | +5 °C to +40 °C |
| What's included | |
| Supplied as: | 310 ml cartridge |
Data sheets
Data sheets and documents
All documents come unchanged from the manufacturer.
Manufacturer information
Manufacturer information pursuant to Art. 19 EU GPSR
Postal address
Hermann Otto GmbH
Krankenhausstr. 14
83413 Fridolfing
Germany
Electronic address info@otto-chemie.de
Information as of: 2026-09-17
Reviews (1)
All reviews come from buyers. Reviews can only be submitted via the personal, signed link we send to the order's e-mail address after delivery; the link is bound to the order and the purchased item, there is no form without a purchase. We check every review before publication and publish positive and negative reviews alike. Reviews from our former shop baustoffhandel-nrw.de were migrated; there, too, only customers who had bought the item could review it.
1 review
20 October 2026 08:57
Erfahrungsbericht
Lieferung super schnell.
Dichtstoff noch nicht eingesetzt. Später mehr.
Vielen Dank !
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