Sealing solutions for glass ceramic cooktops

 

The reference materials presented here, FERMAPOR K31-A 9260-26 and B-N (B-component) made of polyurethane and FERMASIL A-2525-2 and B-2510-1 (B-component) made of silicone, are room-temperature-curing 2-component sealing foams for sealing the frames of glass ceramic cooktops. They have already proven themselves in many years of use by leading appliance manufacturers.

The sealing foam is applied directly to the application surface or in the flat groove of the cooktop frame using FIPFG (Formed-In-Place-Foam-Gasket) technology and our fully automated dosing machines, very precisely, safely and efficiently.

 

Bespoke sealing solutions for glass ceramic cooktops

 

Polyurethane and silicone foam gaskets for the sealing of glass ceramic cooktops

If desired, we can also customize our sealing foam to meet your specific component requirements. Influencing factors include pot life until start of foaming, curing time, and the viscosity, hardness and adhesion properties.

Thanks to its mixed-cell foam structure, the FERMAPOR K31 polyurethane foam gasket has low closing forces during installation and compensates for component tolerances during sealing. It exhibits excellent long-term behavior even after years of continuous use and offers good temperature resistance.

The different reaction phases of the sealing foam in the chronological sequence

 

Reference material

    FERMAPOR K31-A-9260-26        FERMASIL-A-2525-2
    FERMAPOR K31-B-N  FERMASIL-B-2510-1
Mixing ratio   6 : 1 1:1
Pot life time   29 sec. 70 sec.
Tack-free time   4 min. 18 min.

Viscosity of the A component

  33,000 mPas 28,000 mPas
Density of the foam   0.18 g/cm³ 0.28 g/cm³
Hardness (Shore 00)   21 30
Temperature resistance   from -40 to + 80 °C from -40 to + 80 °C

In addition to the reference products, we develop material systems according to your individual requirements. Influencing factors include pot life until start of foaming, curing time, and the viscosity, hardness and adhesion properties.

 

Compensation of component tolerances, very high temperature resistance and suitable for use in damp locations

The alternatively available FERMASIL silicone foam also compensates for component tolerances when sealing and offers very high temperature resistance from -60 to +180 °C. Thanks to the virtually closed-cell foam structure, it offers a low level of hygroscopicity when fitted and compressed.

The silicone foam gasket is hydrolytically stable, it is also suitable for use in humid environments and highly resistant to many chemicals.

The video shows the polyurethane foam seal FERMAPOR K31 in cross section - first in the uncompressed state, then 50% compressed, so that the sealing function of the seal is given.

Cross-section of a polyurethane foam bead – unpressed

 

Cross-section of a polyurethane foam bead with approx. 50 % compression


DM 502 mixing and dosing system with 3-axis linear robot and a transfer belt for the sealing of glass ceramic cooktops

 

Flexible and fully automatic – fully in line with your requirements

The reference configuration shown here is used for the true-to contour application of 2-component sealing foams for sealing glass ceramic cooktops. It consists of the DM 502 mixing and dosing system with a 3-axis linear robot and a transfer belt for the feeding and removal of parts.

The cooktop frames are fed to the dosing station at the cycle rate specified for your production, where they pass under the 3-axis linear robot.

An alternative process option to the transfer belt is to use the WT 1-LEVEL shuttle table. Parts are therefore picked up and processed in continuous shuttle mode in one plane. Another option can be to use the WT 2-LEVEL shuttle table with pick-up plates in two planes situated one above the other in shuttle mode.

The highly dynamic LR-HD 3-axis linear robot used or, alternatively, the highly efficient LR-HE plus ensures that the MK 800 PRO precision mixing head is guided over the component true to contour. At the same time, the mixing head applies the sealing foam to the pre-programmed contour fully automatically with high dosing accuracy.

After the dosing cycle, the coupling point of the foam gasket closes seamlessly and is thus almost invisible. The applied material foams, expanding to several times its original volume, and forms an elastic soft foam gasket with the desired foam hardness at room temperature.

The gasket is extremely resistant to the effects of moisture and temperature. Due to the chemical reaction of the material components, the sealing foams usually achieve good adhesion to the component.

As process experts, we support you with tailored advice for the automation of your manufacturing processes.