Hollow Glass Microspheres
LOW DENSITY EPOXY FILLER
High Performance Clear Casting Resin
1.5 Pounds Net Weight
Approximately 1 Gallon In Volume
The intended application of the syntactic foam is dictated by the amount of the microspheres added to the resin system. Mix equal parts by volume of microspheres with an epoxy resin system and obtain a pourable, self leveling syntactic foam that offers reduced weight per unit volume, suitable for casting parts with improve dimensional stability or as a low density adhesive used in maximizing reduction of structural weight with little effect of the adhesion quality.
Higher loading of the microsphere will yield a paste-like consistency suitable as a fairing compound with excellent stability in its Coefficient of Thermal Expansion or CTE. Adding a small amount of precipitated fumed silica, also known as Cab-O-Sil or Wacker will create a none-sagging or thixotropic compound that can be applied on vertical or overhead surfaces without flowing. Thixotropic syntactic foams can also be s brush or trowel applied coating with improved chemical and abrasion resistance. When mixed with an epoxy based potting or encapsulating resin used in an electronic application, the addition of the microspheres dramatically improves dielectric constants, volume resistivity or electrical insulative values as well as its cured chemical resistant properties.
3M™ Glass Bubbles are engineered hollow glass microspheres that are alternatives to conventional epoxy fillers for lowering weight per unit volume (density) while improving compressive strength performance.
The addition of the microspheres improves the weight to strength ratio and other physical properties of the epoxy system such as:
- LOWER COST PER UNIT VOLUME
- HIGHER COMPRESSIVE STRENGTH
- IMPROVED DIMENSIONAL STABILITY
- IMPROVED ELECTRICAL PROPERTIES
- IMPROVED MACHINABILITY
DESCRIPTION OF MICROSPHERES
TYPICAL DENSITY GRAMS PER CUBIC CENTIMETER
ISOSTALIC CRUSH STRENGTH
Using a 10 gram sample on a U.S. number 140 standard sieve (105 microns), a maximum of three (3) percent by weight glass bubbles will be retained on the sieve.
0.38 grams per cubic centimeter
0.127 (W·m-1·K-1) at 70°F (21°C))
90% @ 5500 PSI
3M™ Scotchlite™ S38-HS Direct PDF Page
S38-HS 3M™ Scotchlite™ are engineered hollow glass microspheres, also known as microballoons that are inert fillers typically incorporated to a binder system such as an epoxy resin to lower its density and improve buoyancy, process sanding, dimensional stability and reduce shrinkage. This unique low density filler is used in a wide range of industries to reduce part weight, lower costs and enhance mechanical properties. The unique spherical shape of Scotchlite glass bubbles offers a number of important benefits including higher filler loading with minimal viscosity increase, reduce exothermic temperatures for large castings while minimizing shrinkage and warping of the casted part.
MATERIALS THAT HAVE A SPECIFIC GRAVITY GREATER THAN WATER WILL SINK AND
DENSITY OF THE EPOXY RESIN WITH 25% TO 30% MICROSPHERES = 0.85 g/cc
Note the buoyant sample, which contains 30% by volume of the microsphere filler added to MAX CLR A/B
FOR HIGH IMPACT, LOW-DENSITY COLOR STABLE CASTINGS:
Prepare 2 Parts Mixed MAX CLR EPOXY RESIN (A/B) TO 1 Part Microsphers will make a self leveling pourable or paintable compound offering excellent durability.
To make a non-sagfing thixotropic patching putty, Please check out our MAX BOND THIXOTROPIC EPOXY RESIN.
Use it as the base resin and mix approximately 2 parts mixed MIXED MAX BOND THIXOTROPIC to 1 part MICROSPHERES to create an excellent patching compound for marine hulls and similar repairs.
The addition of the MICROSPHERES willmake the putty very machineable and sandable upon cure.
These resin systems can be used as the base epoxy system. Make sure to keep the base resin’s inherent mix ration the same regardless of the amount of microspheres added.
MIXED WITH THE MAX CLR RESIN SYSTEM
SURFBOARD REPAIR AND RESURFACING
THE RESULTING MIXTURE CURES TO A HARD INTEGRAL SKIN THAT ELIMINATES WATER ABSORPTION AND IMPROVED FOAM DURABILITY THE CURED SURFACE IS ALSO MACHINEABLE AND DEMONSTRATES EXCELLENT SANDABILITY.
APPLY A SKIN COAT UNTO EPS STYROFOAM. ONCE THE SYNTACTIC FOAM HAS CURED, POLYESTER RESIN CAN BE USED WITHOUT MELTING THE POLYSTYRENE FOAM