Pressure Chamber, Electron Microscopy Sciences

50465-10 50465-20
100497-426EA 505.07 USD
100497-426 100497-428
Pressure Chamber, Electron Microscopy Sciences
Hot mounting takes place under pressure in a mounting press, where the specimen is placed in a cylinder together with the appropriate mounting resin

A temperature of up to 200°C, and a pressure of up to 50kN are then applied during the embedding of the specimen. There are two types of hot mounting processes: thermoplastic resins and thermo-setting resins. When preparation requirements include less expensive, uniform size and shape, and short processing times, hot mounting (hot compression mounting) is ideal.

Hot mounting takes place under pressure in a mounting press, where the specimen is placed in a cylinder together with the appropriate mounting resin. A temperature of up to 200°C, and a pressure of up to 50kN are then applied during the embedding of the specimen. There are two types of hot mounting processes: thermoplastic resins and thermo-setting resins.

Thermoplastic Resins melt when heated, offering the opportunity of repeating the process with the same specimen if the result is not satisfactory the first time. Thermoplastic resins harden during a chemical reaction with or without pressure. That means high pressure is not necessary during heating and cooling. This process is good when mounting fragile specimens.

Thermo-setting Resins cure at elevated temperatures under pressure. Thermo-setting resins cannot be re-melted after mounting.

2. Cold Mounting

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.

Mounting

Disposable Mold Cup -

Mounting cups for Cold Mounting/Embedding. Polyethylene, one part molds. Closed one end. Red

Silicone Mold-

Flexible silicone rubber mounting cups for Cold Mounting/Embedding. Closed bottom; red

Hot & Cold Mounting/Embedding Accessories

Pressure Chamber

This chamber is designed in conjunction with our cold molded acrylic and epoxy media. After encapsulating the sample, they are placed inside the chamber. By applying between 30 to 40 PSI during the cure time, the mounting compound is compressed down and around the sample, forcing air up to the surface. This process helps eliminate shrinkage and increase clarity and edge retention. Comes with an air hose. As an option an air pump tank is available. This Air Pump is designed for hand pumping pressure. Thermoplastic Resins melt when heated, offering the opportunity of repeating the process with the same specimen if the result is not satisfactory the first time. Thermoplastic resins harden during a chemical reaction with or without pressure. That means high pressure is not necessary during heating and cooling. This process is good when mounting fragile specimens.

Thermo-setting Resins cure at elevated temperatures under pressure. Thermo-setting resins cannot be re-melted after mounting.

2. Cold Mounting

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.
Mounting
Disposable Mold Cup -
Mounting cups for Cold Mounting/Embedding. Polyethylene, one part molds. Closed one end. Red
Silicone Mold-
Flexible silicone rubber mounting cups for Cold Mounting/Embedding. Closed bottom; red
Hot & Cold Mounting/Embedding Accessories
Pressure Chamber
This chamber is designed in conjunction with our cold molded acrylic and epoxy media. After encapsulating the sample, they are placed inside the chamber. By applying between 30 to 40 PSI during the cure time, the mounting compound is compressed down and around the sample, forcing air up to the surface. This process helps eliminate shrinkage and increase clarity and edge retention. Comes with an air hose. As an option an air pump tank is available. This Air Pump is designed for hand pumping pressure.
Order Now

Learn more

About VWR

Avantor is a vertically integrated, global supplier of discovery-to-delivery solutions for...

Learn more About VWR