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FAQ

Sealing

Sealing of joints with bituminous substrates

Which products can be used for sealing joints in contact with bituminous substrates?

Contact between elastic sealants and bituminous substrates must be avoided in order to preclude staining and incompatibilities e.g. by such measures as sealing off with OTTOSEAL® A 250 (refer to technical data sheet of OTTOSEAL® A 250).

Sealing of swimming pools

Which sealants are suitable for sealing swimming pools?

We recommend using OTTOSEAL® S 18 for swimming pool liners (PVC) or, for natural stone applications, OTTOSEAL® S 70 or S 140 which are compatible with natural stone. The swimming pool liner must be treated with OTTO Primer 1217 beforehand.

Sealing of swimming pool with GRP and polyester

Which sealants are suitable for sealing joints in swimming baths made from GRP and polyester?

We recommend using OTTOSEAL® S 18 or, for natural stone applications, OTTOSEAL® S 70 or S 140, which are compatible with natural stone. The materials must be treated with OTTO Primer beforehand.

(Recommandations on the use of primers -> see primer table of respective technical data sheet)

Sealants / silicone sealants

Adhesion of silicone sealants

What has to be taken into account regarding the adhesion of silicone sealants such as OTTOSEAL® S 100 and S 105 on sanitary acrylic?

The sanitary acrylic must be pre-treated with Cleanprimer 1101 to achieve an optimal adhesion.

Maintenance joints

Are silicone joints always maintenance joints?

Potential maintenance joints are, for example, joints that are exposed to strong chemical and/or physical influences or constant wet exposure and/or are regularly treated with high-pressure cleaners.

These include joints in sanitary areas, large kitchens, swimming pools, in industrial areas as well as floor joints subject to heavy wear.

An elastic (silicone) joint in private and professional/public sanitary areas should be checked at regular intervals to avoid consequential damage.

Any damage found to the (silicone) joint on the sealant used must be repaired immediately to avoid consequential damage to the structure and/or the fabric of the building. Professional renewal is required to remove this damage.  

You can find tips for professional joint remediation in the guide entitled Perfect mould prevention & remediation.

Stains

What are the possible causes for staining of silicone sealants?

Without external influences OTTO silicone sealants show no stains. External influences which might cause staining are, for example,

  • incompatible materials when in contact with the sealant such as bitumen, paintwork, neoprene, EPDM etc.
  • incompatible cleaners and disinfectants (e.g. agents containing halogen and formaldehyde)
  • micro organisms (such as mould, algae)
  • fumes /smoke (such as coatings, tobacco smoke, welding fumes)
  • environmental impact

Paintability

Which types of sealants can be completely painted?

Paint-compatible sealants are sealants that can be used to seal building components coated with paint without harmful interactions occurring between the sealant and the paint and adjacent building materials. This also applies in the same way to a subsequent painting of the components, where the paint on the sealant must be limited to 1 mm in the edge area of the joint. For example, paint-compatible sealant (e.g. OTTOSEAL® S 110 or OTTOSEAL® S 120) can be subsequently applied to the joint surface at up to 1 mm in the frame edge area and the glass retaining strip when sealing the glass rebate on a wooden window.

Sealants that can also be coated over the entire surface are paintable. The information in the applicable technical data sheet, in particular on the suitable painting systems, must be observed.

Drying of silicone sealants

How do silicone sealants cure?

Silicone sealants react with humidity in the air and cross-link from the outside and inside. Complete cross-linking is completed after about 5 to 8 days (+ 23 °C / 50 % relative humidity) at a joint depth (sealant thickness) of about 6-7 mm in an indoor climate. Lower temperatures and/or humidity will extend the hardening time.

Silicone sealants and water

When should freshly-applied silicone sealants come into contact with water first?

Showers, washbasins, bath tubs etc. which have been sealed with, for example, OTTOSEAL® S 100 or OTTOSEAL® S 105 can be put back into service after 1 to 3 days.

OTTOSEAL® S 100 and OTTOSEAL® S 105 are immediately water resistant: however, no mechanical stress must be put on them during the curing period for at least 1 or 2 days by means of cleaning or weight loads (expansion and compression of the joint)

Effect of primers between adhesive and substrate

What is the effect of a primer with regard to the interaction between sealant and substrate?

Primers are adhesion agents which improve the adhesion of the sealant on porous or problematic substrates. The primer leaves a film or residual adhesion agent on the substrate on which the sealant has a better adhesion.

Substrates must be dry, neat and clean during the priming process. Apply primers sparingly to non-absorbent substrates and apply generously to absorbent substrates. Please see the technical data sheet and priming table!

Transport and storage

How good is the frost resistance of adhesives and sealants during transport and storage?

Transportation and storage of anhydrous adhesives and sealants based on silicon, hybrid and polyurethane are possible for a limited period. Permanent storage at temperatures below 0°C is not recommended, particularly because processing of "cold" sealants leads to longer curing times and most products are of a harder consistency at low temperatures, as is the case when they are taken from cold storage and processed immediately. “Cold” products should be warmed to room temperature prior to processing.
After complete curing these products are permanently resistant to temperatures below 0°C.
During processing care should be taken that there is no ice, dew, condensation water or any other source of dampness on the seal surfaces, as this functions as a release agent and impairs or prevents bonding of the sealant.

Aqueous adhesives and sealants based on acrylic dispersions, as well as OTTOCOLL® A 270 and the aqueous OTTOFLEX products, are not resistant to frost when unprocessed and during the curing phase and should not be stored or processed at a temperature below + 5°C Some acrylic dispersions are resistant for a limited period and can be transported at -10°C for a maximum of 48 hours. In this context the information provided in the latest technical sheets should be referred to. Longer storage or storage/transportation at lower temperatures causes irreversible frost damage to the acrylic sealant (coagulation).
After complete curing most acrylic dispersions are permanently resistant even at temperatures below + 5°C.

Adhesives

Steps

Which products are suitable for the bonding of stairs?

For bonding staircases, we recommend using OTTOCOLL® P 85 or OTTOCOLL® Rapid (force-locked indoors) or OTTOCOLL® M 500, M 501 or M 550 HiTack (stress-balancing indoors and out).

Effect of primers between adhesive and base

What is the effect of a primer with regard to the interaction between adhesive and substrate?

Primers are bonding agents which improve the adhesion of the adhesive to porous or problematic substrates. The primer leaves a film or residual bonding agent on the substrate on which the adhesive can build up better adhesion.

Substrates must be dry and clean when priming. Primer must be applied sparingly to non-absorbent substrates and generously to absorbent substrates. Observe the technical data sheet and priming table!

Transport and storage

How good is the frost resistance of adhesives and sealants during transport and storage?

Transportation and storage of anhydrous adhesives and sealants based on silicon, hybrid and polyurethane are possible for a limited period. Permanent storage at temperatures below 0°C is not recommended, particularly because processing of "cold" sealants leads to longer curing times and most products are of a harder consistency at low temperatures, as is the case when they are taken from cold storage and processed immediately. “Cold” products should be warmed to room temperature prior to processing.
After complete curing these products are permanently resistant to temperatures below 0°C.
During processing care should be taken that there is no ice, dew, condensation water or any other source of dampness on the seal surfaces, as this functions as a release agent and impairs or prevents bonding of the sealant.

Aqueous adhesives and sealants based on acrylic dispersions, as well as OTTOCOLL® A 270 and the aqueous OTTOFLEX products, are not resistant to frost when unprocessed and during the curing phase and should not be stored or processed at a temperature below + 5°C Some acrylic dispersions are resistant for a limited period and can be transported at -10°C for a maximum of 48 hours. In this context the information provided in the latest technical sheets should be referred to. Longer storage or storage/transportation at lower temperatures causes irreversible frost damage to the acrylic sealant (coagulation).
After complete curing most acrylic dispersions are permanently resistant even at temperatures below + 5°C.

Sanitary

Colour comparison tables for joint mortars

Are there any colour comparison tables between grouts from different manufactures and OTTO silicones?

Yes, on our website.

Difference between OTTOSEAL® S 100 and OTTOSEAL® S 105

What is the difference between OTTOSEAL® S 100 and OTTOSEAL® S 105?

OTTOSEAL® S 105 is a standard acetate silicone with good processing characteristics. OTTOSEAL® S 100 is a premium sanitary silicone characterised by unique, unparalleled processing properties, such the surface can be smoothed extremely well. Furthermore, OTTOSEAL® S 100 is available in stock in a great variety of colours.

Composite sealing

Products for composite sealing

Which OTTO products can be used for the composite sealing?

In addition, our range of OTTOFLEX accessories includes sealing tapes, sleeves, corners, tub edge sealing tape, sound insulation tape and protective tape.

You will find a detailed description of how to carry out bonded waterproofing in our guide entitled The OTTOFLEX System.

Swimming pool

Sealing of swimming pools

Which sealants are suitable for sealing swimming pools?

We recommend using OTTOSEAL® S 18 for swimming pool liners (PVC) or, for natural stone applications, OTTOSEAL® S 70 or S 140 which are compatible with natural stone. The swimming pool liner must be treated with OTTO Primer 1217 beforehand.

Sealing of swimming pool with GRP and polyester

Which sealants are suitable for sealing joints in swimming baths made from GRP and polyester?

We recommend using OTTOSEAL® S 18 or, for natural stone applications, OTTOSEAL® S 70 or S 140, which are compatible with natural stone. The materials must be treated with OTTO Primer beforehand.

(Recommandations on the use of primers -> see primer table of respective technical data sheet)

Wood

Wood and wood materials with PU adhesives

Are adhesions of wood and derived wood products with PU adhesives, such as OTTOCOLL® P 84, OTTOCOLL® P 85 or OTTOCOLL® Rapid, weather-resistant and suitable for outdoor applications?

OTTOCOLL® P 84, OTTOCOLL® P 85 and OTTOCOLL® Rapid meet the specification in compliance with DIN EN 204 D4, i.e. the adhesive has to be protected by an appropriate coating.

Bonding wood and wood materials

Are there any peculiarities which must be taken into account when bonding/sealing wood and derived wood materials?

In the case of wood types containing oil, such as teak, the adhesion and compatibility have to be tested beforehand.

Glass and windows

Bonding and sealing of glass

Which products can be used for the sealing and bonding of glass?

Thanks to their excellent glass adhesion and resistance to UV, we recommend using OTTO silicone sealing and bonding agents such as OTTOSEAL® S 7, S 9, S 10, S 110 and S 120, and OTTOCOLL® S 81, S 88, S 610 and S 670. More information on this can be found in the technical data sheets for the product in question.

Window sealing

Are there any silicone-free sealants for sealing windows?

OTTOSEAL® M 350 is a silicone-free sealant for glass rebate sealing on wooden windows that complies with the requirements of DIN 18545, stress groups A and D. OTTOSEAL® M 350 exhibits low residual tack and is less wear-resistant than high-quality glazing sealants such as OTTOSEAL® S 110 or OTTOSEAL® S 120.

Difference between side-by-side and BlueLine cartridge

What is the difference between the side-by-side cartridge compared to the BlueLine cartridge with regard to the application speed?

With the accompanying static mixing nozzle, the Blue Line cartridge has an application speed up to three times faster than the accompanying static mixer nozzle to the side-by-side cartridge.

Structural glazing

Are there bonding agents that can be used for glass façades?

OTTOCOLL® S 645 is a 2K silicone bonding agent for load-bearing bonding. The product is certified according to ETAG 002 and has been approved in accordance with European Technical Assessment ETA-19/0692. It is suitable for structural glazing applications as well as the production of all-glass corners, dividers made from glass and glass constructions subject to approval.

The bonded window

Are there bonding agents for static and burglar-resistant glazing?

Here, we offer a range of 1K and 2K silicone bonding agents. OTTOCOLL® S 88 is our 1K silicone bonding agent with a very broad bonding spectrum and is ideal for the static bonding of windows. Our 2K silicone bonding agents OTTOCOLL® S 81 and OTTOCOLL® S 670 feature reliable and fast hardening, even when in thicker layers. Both are available in the user-friendly BlueLine cartridge, which features a higher output in a shorter space of time.

Connection to structures

Are there OTTO products for installing windows?

Our product range covers all of the key installation options in this area. OTTOSEAL® M 360 is our sprayable sealant for outdoor and indoor joints. We also offer OTTOPUR PU foams for heat and sound insulation in connection joints. The range is completed with our OTTOTAPE multi-function sealant tapes and construction connection tapes.

Processing

Processing outdoors

Is OTTOSEAL® S 100 suitable for outdoor use (e.g. for ceramic flooring on terraces)?

Yes, OTTOSEAL® S 100 is suitable for exterior use and boasts very good weathering, ageing and UV resistance.

 

Processing criteria

Which criteria have a negative impact during the open time?

In bonding processes and bonding techniques, the open time is the permissible period of time from the beginning of the application of the bonding agent to the joining of the parts to be bonded. This can be influenced by heat, draughts, absorbent substrates and sunlight, among other things.

Temperature

Why should jointing work not be carried out at temperatures below + 5 °C?

At low temperatures, there is a risk of condensation forming a thin, invisible layer of ice or water on the substrates. This separating layer prevents optimal adhesion of the sealants to the substrate.

Single-component hybrid, PU and silicone products require ambient humidity to harden which is virtually non-existent at low temperatures below + 5 °C. Water-based sealants such as dispersion acrylates are sensitive to frost when fresh and must not be processed at temperatures below + 5 °C.

Matt colours

What needs to be observed when processing OTTOSEAL® S 70 in matt colours?

When smoothing matt colour shades, note the following: the sealant should only be removed once with a smoothing tool that has been dipped in OTTO marble silicone smoothing agent. The more often the surface is reworked with smoothing agent, the more the matt effect is lost and the sealant surface becomes glossier.

Stability

UV resistance and weather resistance

Are all OTTO silicone sealants resistant to UV and the weather?

Yes, all silicone sealants from OTTO have excellent UV and weather resistance.

Frost resistance of sealants and adhesives

What is the frost resistance of bonding agents and sealants during transport and storage?

Anhydrous bonding agents and sealants based on silicone, hybrid and polyurethane can be temporarily transported and stored at below-zero temperatures. Permanent storage at temperatures below 0 °C is not recommended, especially because processing of the "cold" bonding agents and sealants results in delayed hardening and most products have a firmer processing consistency at cold temperatures when they are removed from cold storage and then processed immediately. "Cold" products should be brought to room temperature before processing. After complete hardening, the processed products are permanently resistant even in the long term below 0 °C.

When working in cold temperatures, it is essential to ensure that no ice, condensation or other moisture is present on the flanks of the bonding agent, as this acts as a separating film and can impair or prevent adhesion of the bonding agent.

Water-based dispersion sealants and bonding agents, as well as water-based OTTOFLEX products, are not frost-resistant in their unprocessed state and must not be stored or at temperatures below + 5 °C while they are hardening. For a short time, some dispersion acrylates are resistant during transport to temperatures down to - 10 °C for a maximum of 48 hours. The information provided in the relevant current technical sheet must be observed for this. Prolonged storage or storage/transport at lower temperatures leads to irreversible frost damage of acrylate sealants and bonding agents (coagulation).

After complete hardening, dispersion acrylates are permanently resistant even below + 5 °C.

Mould

Attack of mould

What must be done if a joint is affected by mould?

A joint affected by mould must always be remediated, as there is a risk of damage to the building fabric. Detailed information on this can be found at otto-anti-mould.com.

Classification

Building material class

To which building material class do the OTTO products belong?

When fully cured, all the OTTO adhesives and sealants correspond to at least building material class B2 (according to DIN 4102). OTTOSEAL® S 51, S 54, and S 94 are conform to building material class B1.

Fire-resistance rating

To which fire resistance classes do OTTO adhesives and sealants conform?

OTTO silicones OTTOSEAL® S 51, S 54 and S 94 are tested according to DIN 4102 and correspond to building material class B1 (flame retardant) when fully hardened.

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