Gurit SP Microballoons are hollow phenolic resin spheres which have a distinctive reddish/brown colouration. This makes them particularly useful for cosmetic fillet joints and fillers in wood construction, as well as structural adhesives for less demanding applications on softer timbers such as cedar. Although not as waterproof as SP Glass Bubbles, SP Microballoons are often preferred for their excellent sanding characteristics.
They are not normally used with polyester or vinylester resins because they can be subject to styrene attack which may cause the spheres to collapse.
It is particularly important to exclude air while in storage as they readily absorb atmospheric moisture which will affect the performance of the filled mixture.
SP Glass Bubbles and SP Microballoons can be mixed in any proportion for colour purposes.
For General Health Information see section on hazards.