Product Information
MICROSPHERES GREY 2 L
Grey microspheres are a filler for thickening resin. The hollow Fillite microspheres, separated from fly ash, are aluminium silicate (27–33% Al2O3; 55–65% SiO2). They are inert, grey-coloured, hollow spheres with a melting point of 1200–1350 °C. Bulk density is 0.30–0.45 g/cm³ and packing density 60–65%. The shell thickness is on average 1/10 of the sphere diameter. Hardness on the Mohs scale is 5. Kysy ChatGPT:ltä
Working
Fillers prevent the adhesive from flowing out of the joint and excessive absorption into the bonded materials. Adding fillers also increases the thickness of the adhesive layer.
Fillers are added to the pre-mixed resin-hardener mixture. When thickening, the amount of filler usually does not need to be measured precisely. Filler is added to the resin-hardener mix until the desired consistency or property is achieved. The accompanying table provides indicative values for the amount of filler used in different cases. The values in the table indicate how many parts by volume of filler are added to one part by volume of the resin-hardener mixture.
Filler Selection
Selection of filler | Phenolic microspheres | Glass microspheres | Cellulose fibre | Fumed silica | |
Filling and fairing | Easy to sand and fill for cosmetic wood applications | ✓ | ✓ | ||
Common applications | ✓ | ✓ | |||
Putty with improved wear resistance | ✓ | ||||
Bonding | Common bonding applications for softwood, brown | ✓ | ✓ | ||
Common bonding applications for softwood, white | ✓ | ||||
Structural wood bonding, matte | ✓ | ✓ |
Putty Mixing
FILLER | FILLER AMOUNT (%) | PER 1KG | SILICA FLOUR ADDITION (%) | PER 1KG | APPROXIMATE DENSITY (g/cm³) | APPROXIMATE AMOUNT (liter) |
Phenolic microspheres, brown | 15 - 20 % | 150 - 200 g | 3 - 5 % | 30 - 50 g | 0.7 | 1.8 |
Glass spheres, white | 15 - 20 % | 150 - 200 g | 4 - 6 % | 40 - 60 g | 0.6 | 2.0 |
Cellulose fibre, white/matte | 7 - 10 % | 70 - 100 g | 2 - 4 % | 20 - 40 g | 0.9 | 1.0 |