The VQM products are formulations comprising a vinylfunctional QM resin and vinylfunctional silicone polymers. They are used for producing transparent, filler-free formulations with good mechanical properties or for improving the mechanical properties and the flow behavior of filled systems.
Typical Applications
In transparent silicone formulations Polymer VS can be either partially or fully replaced with VQM products. In filler-containing formulations VQM can be used as a substitute for both, Polymer VS and some of the filler and/or silica. Please note that the vinyl content of VQM products is higher than that of Polymer VS grades of comparable viscosity. This can generally be offset by increasing the SiH content (Crosslinker 100/200 series).
Comparison Silica- vs. VQM-Formulation
The following table shows a comparison between a VQM-based formulation and an analogous formulation based on fumed silica (AEROSIL®). Both formulations contain 30% silica and/or silicone resin. In both cases, the crosslinker concentration was adjusted to have an SiH/Vinyl ratio of 2.0.
Test values show the typical differences between these two technologies. Significantly, lower viscosities can be achieved with crystal-clear VQM formulations. Silica, in contrast, yields better elasticity and tear propagation resistance. Further information about designing formulations with VQM is available upon request.
Comparison Silica- vs. VQM-Formulation
The following table shows a comparison between a VQM-based formulation and an analogous formulation based on fumed silica (AEROSIL®). Both formulations contain 30% silica and/or silicone resin. In both cases, the crosslinker concentration was adjusted to have an SiH/Vinyl ratio of 2.0.
Test values show the typical differences between these two technologies. Significantly, lower viscosities can be achieved with crystal-clear VQM formulations. Silica, in contrast, yields better elasticity and tear propagation resistance. Further information about designing formulations with VQM is available upon request.
Benefits at a glance
- For transparent and filler-free formulations with good mechanical properties
- For improving the mechanical properties of filled systems