With increasing driving force on insulation panels with higher insulation performance with lower thicknesses, create a market need to develop new insulation materials. Especially, vacuum insulated panels as superinsulation materials, still have an opportunity to invent new core materials from locally occurring materials like natural fibers and different kind silicates with high porosity like zeolite, sepiolite, diatomite etc. That kind of materials can be used to produce powder-glass fiber hybrid core materials. They have the positive effect on the critical inner pressure of core material. Sepiolite is a Magnesium Hydroxyl Silicate clay with high surface area and fiber-like structure. So that makes the sepiolite is an interesting material for superinsulation research works. Investigation of glass fiber vacuum insulation panels is well justified. As seen from the work, the low sepiolite content and without sepiolite addition glass fiber core materials show better thermal insulation performance. The performance differences on thermal insulation. overall the objectives have been achieved in this study.