Dichtstoffe | Markensortiment und Anwendungsexpertise

Sealants

Sealants join a wide variety of materials together. They seal surfaces, shafts, screw connections, joints or seams. Sealants are pastes or liquids that either remain in their liquid state or only harden when used. No sealant can fulfill all requirements equally. The right sealant must be selected depending on the type of joint and area of application. The spectrum ranges from non-hardening, permanently plastic sealants to hardening and rigidly hardening, non-flexible systems. Special types are resistant to aggressive chemicals such as acids or alkalis and other sealants can withstand extreme heat.

Surface densities
Thread seals
Elastic/plastic sealants
Sealing tapes
Brands

Surface seals prevent the escape of liquids or gases by forming impermeable barriers. These seals must therefore remain intact and tight over a long period of time. The sealing material must be resistant to the liquid and/or gaseous media and to the operating temperatures and pressures to which it is exposed. Gaskets are self-forming gaskets that seal flanges perfectly with maximum surface contact and provide effective corrosion protection between the flanges. Good resistance to low pressures is achieved immediately after installation. Within approx. 24 hours, a tight seal is created that does not settle, crack or shrink.

Advantages of surface seals compared to conventional solid seals

One-component - easy and clean to apply
Replaces conventional solid seals - Less storage space required
Fills roughness depths and shape deviations
No settling, no retightening of screws required
Excellent immediate sealing effect
High resistance to solvents and lubricants
Resistant to high pressures after curing

Threaded seals prevent the escape of gaseous and liquid media. They can be used for applications at low and high pressures. They fill the gaps in the thread and achieve an immediate sealing effect against low pressures. When fully cured, they can seal connections up to the burst pressure of most pipelines.

Advantages of thread sealants compared to conventional sealants

one-component - clean and easy to apply
No creeping, shrinking or clogging of systems
can be used for threaded pipe connections of all sizes
replaces sealing tapes and hemp plus paste
The seal is resistant to vibration and shock loads.
Product types with several approvals, e.g: KTW approval for drinking water, DVGW approval for gas and water supply
Prevents corrosion in the thread

Sealing joints and seams places particular demands on the elasticity of the sealant. The sealants often have to adhere to a wide variety of substrates, withstand high temperatures and also be resistant to a wide range of chemicals. Groove seals are often used in air conditioning and ventilation technology, in mechanical engineering and in paint shops. Particularly when it comes to sealing components that have a groove and are exposed to large temperature fluctuations, impacts and heavy vibration, great demands are placed on the thermal stability and elasticity of the sealant.

Elastic sealants: They achieve their sealing effect through adhesion to the surfaces. Due to its elastic behavior, the sealant forms a barrier that prevents the penetration of media; however, relative movements are tolerated.

Plastic sealants: Every sealant deforms when force is applied. This deformation has both a plastic (deformable) and an elastic (rubbery) component. If the plastic part predominates, it is referred to as a plastic sealant.

Advantages of elastic/plastic sealants

Improved visual appearance
New design possibilities
use of new materials, including high-performance composites
fewer parts
improved reliability and durability
higher quality
weight reduction, lightweight construction
efficient manufacturing process, fewer production steps
cost reduction

Due to their inherent tackiness, butyl and polyisobutylene sealants adhere to metals, glass, ceramics, mineral substrates, wood, PS, EPDM and other plastics.

Advantages of the sealing tapes