EMS MATERIALS SCIENCE & METROLOGY CATALOG 2019–20 EDITION SAMPLE PREPARATION & SUPPLIES Cold and Hot Mounting Media and Molds (continued)  Cold Mounting


CHOOSING A COLD MOUNT* Cat # Resin Color


Refractive index: ND = 1.578


1233 EMSFix Clear, Transparent


Cold mounting or embedding is when a resin is mixed with a hardener (or accelerator) to provide the mounting compound, and then the polymerization process take place to form the block. In some cases, this process gives-off heat. However this heat generation can be controlled by the use of ice or cool air blow setting. Cold mounting compounds are preferred for specimens that are sensitive to the heat or pressure, which applies during the hot mounting process. There are three types of cold mounting:


1. Epoxy Systems — Epoxies have the lowest shrinkage of all cold mounting resins. The curing time is relatively long, but the adhesion to most materials is excellent. They are also used for vacuum impregnation. The hardened epoxy is duroplastic and not affected by moderate heat or chemicals.


2. Acrylic System — Acrylics are easy to use resins with short curing times and negligible shrinkage. They consist of self- polymerizing components that harden with the addition of catalyst. Hardened acrylic is thermoplastic and resistant to most chemicals.


3. Polyester Systems — Polyester belongs to the catalyzed system, like acrylics. Curing times are relatively short and the hardened specimen is duroplastic.


1234 UniMount Clear, Cold and Hot Mounting Media and Molds (continued)


Curing Shrinkage Time


1232 EpoFix Clear, Approx Transparent


12 hours


Refractive index: at 75°C/F ND = 1.561 167°


Transparent


Refractive index: ND = 1.573


when cured under pressure). Otherwise semi-transparent.


1245 Epoxy- Fluorescent dye – Dye


for use in microscopy to make cracks and pores visible.


1256 AcryMount Dull – –


For use with EpoFix and Unimount


yellowish, examination partly


transparent


1257 GeoFix Colorless, clear 20 min • • • 85 Shore D Extraordinarily (extremely clear


clear mounts


when cured . under pressure)


1258 MatFix Light yellow 30 min •


85 Shore D Fast curing, No shrinkage


1259 LiteFix Off-white 20 min • •


84 Shore D Edge Retention, Planeness


1265 Acrylic- Blue, Red Dye


& Yellow 1270 Poly- – – –


identification of acrylic mounts


Mount Polyester of specimens Low viscosity


not sensitive to heat


1276 Poly-


AcryMount Polyester/ Acrylic


White * 30 mm dia. mount with a 45% carbon steel specimen (20 vol%) 5


18-25 min • – Edge Retention, Planeness


Transparent 45 min • • • • – Serial mounting Dyes for easy 10 min • • • • 82 Shore D Routine


1½ hr • in oven


8 hours •


1-4 (Best=1) Hardness Application •


78 Shore D Vacuum impregnation,


Mineralogical samples


85 Shore D Vacuum


Mineralogical samples


84 Shore D Vacuum impregnation


1235 TransFix Colorless, clear 20 min. • • • 83 Shore D Vias (extremely clear


Porous samples impregnation Porous samples,


Mineralogical samples


Microvias


Porous samples


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