Sil-Cel Spherical Microballoons

GENERAL DESCRIPTION: Microballoons are a lightweight free-flowing white powder consisting of microscopic, hollow, glass ball clusters. Microballoons are a specially processed silica glass, classified to insure uniform particle size and product performance and is hydrophopic (does not readily adsorb moisture). It disperses extremely well when mixed with various resins or plaster. Microballoons do not absorb resin and therefore provide maximum filler function. Cured systems are more water resistant and have a higher temperature resistance in addition to being more thermal and electrical resistive.

In addition, microballoons reduce the weight of the finished the product and offers improved workability (nailing, sawing, drilling, etc.) further reducing costs. It has been used extensively in molded vanities, doors, columns, lighting fixtures, picture frames, etc. It is more more easily sanded than fiberglass flock, so it can be used in polyester systems where extremely high-strength is not required. It can be used in sandable pastes to repair imperfections in wood and fiberglass boats, cars or other parts. Many engineering students at the university level have used microballoons to increase buoyancy and as a lightweight and inexpensive filler in cement canoe projects.

PROPERTIES:
Specific gravity: 0.18
Effective Particle Density: 11.2 lb / cu ft
Surface pH: 7.0
Free moisture by weight: 0.4%
Dry bulk density: 0.13 g/cc (8 lb/cu ft)
Thermal conductivity (K): 0.36
Average particle size: 75 microns
Melting point: 2300°F
Natural Color: White
ASTM D1483 Oil Adsorption, g oil/100cc: 30
Water Adsorption: 0.3% max
Average Particle Size: 75 microns
Particle Size Range: 1-300 microns
Approximate compressive crush strength: 1,800 psi


CHEMICAL ANALYSIS:
73% SiO₂
17% Al₂O₃
5% K₂O
3% Na₂O
1% CaO
+ trace elements


PARTICLE SIZE DISTRIBUTION:
+ 50 Mesh: 2%
-50 +100: 15%
-100 + 200: 33%
-200: 50%


Recommended proportions vary. Add microballoons to suit application keeping in mind that the greater the amount, the thicker fluid will become (higher viscosity). Power mixers should be of the folding type so that the micro balloons will not be broken open. In low viscosity resin systems the hollow spheres have a tendency to float. The addition of Cabosil and/or Fillite, will control the problem. By adding chopped fiberglass strands, the strength can be substantially increased.

Microballoons are available in the following sizes:

1 Gallon plastic bag (12 oz)

5 Gallon plastic pail (10 lb)

Original paper bag (28 lb)

1 Skid (2000 lbs) - Call