Hollow Glass Microspheres 70um for PVC Plastisol
Hollow Glass Microspheres 70umCL38 obtain compressive strength of 5500 PSI. That prevent the sphere broken during mixing and pumping. The production and application of PVC plastisol involves multiple high-stress processes, including high-shear mixing, pumping circulation, and spraying. If the compressive strength of the microspheres is insufficient, they are highly susceptible to breakage. In case broken, the internal cavities disappear, the specific surface area increases dramatically. That will lead to increased system viscosity, plasticizer adsorption, and consequently affecting the coating’s application performance.
The low oil absorption of 75µm hollow glass microspheres is another noteworthy technical advantage. In PVC plastisol systems, plasticizers are key components affecting system viscosity and curing performance. Microspheres with low oil absorption do not excessively absorb plasticizers. In this way, it helps to maintain stable system viscosity and avoiding rheological changes caused by plasticizer adsorption by fillers.
The spherical structure of CL38 hollow glass microspheres can disperse impact energy in PVC plastisol, improving the coating’s stone chip resistance. In applications requiring stone impact resistance, such as automotive undercoating, CL38-filled PVC plastisol coatings effectively absorb the energy of impacts from hard objects like stones, reducing the risk of coating damage. Typical applications of these hollow glass microspheres in PVC plastisol include: automotive chassis protective primers for corrosion protection and stone impact resistance; body sealants for weld sealing and waterproofing/dustproofing; and industrial PVC coatings for protective coatings on metal surfaces.
