Glass casting

Treatments used for various types of fractures are cast immobilization, traction, and internal fixation. A plaster or fiber glass cast is the most commonly used device for fracture treatment. Most broken bones heal successfiiUy once properly repositioned, ie, fixed in place via a cast. This type of cast or brace is known as an orthosis. It allows limited or controlled movement of nearby joints. This treatment is desirable for certain fractures. 

Master membranes (up to 9 cm in diameter) can be cast with a uniform thickness except at their edges near the glass casting rings. 

The nitrator can be made of glass, cast iron, lead, or steel. 

Preparation of CR-39 Polymer. Benzoyl peroxide was dissolved In CR-39 monomer at room temperature In an argon atmosphere. Once dissolved, the solutions were poured Into glass casting plates and placed In an 80 C oven In an argon atmosphere. The samples were removed from the oven after 24 hrs. 

To prepare glazing, transparent sheets are cast in cells made of plate glass with flexible gaskets used as spacers (cf, Sandler and Karo [87], Procedure 4-2 for a detailed description of a glass casting cell). Control of the polymerization temperature used with such cells varies considerably with the thickness of the polymer sheet to be produced. For example, a sheet 3- to 5-mm thick can be prepared at 70°C with a monomer solution containing 3% of dibenzoyl peroxide over a period of 60-72 hr in a circulating air oven. After the sheet is removed from the cell, it is postcured at 115°C for an additional 2 hr. With thicker sheets, lower initial temperatures are required to permit proper dissipation of the heat of polymerization. 

In a glass casting cell [cf. 76a] prepared from j-in. plate glass with a spacer sufficient to give a -in. thick final sheet, cooled to 20°C, is placed a cool (20°C) solution of diethylene glycol bis(allyl carbonate) containing 4 wt% based on the monomer of diisopropyl peroxydicarbonate (DIPP). 

Enamelled cast-iron, glass-lined steel Enamelled cast-iron, glass-lined steel, reflux condenser and piping in borosilicate glass Cast steel... 

Typical Use Acrylic glass, e g. Paraglas , Decarglas . Typical Use Acrylic glass- cast extruded or injection moulded. ... 

Typical Use Acrylic glass cast, extruded, injection moulded. Typical Use Metals, most plastics, glass, wood, textiles, stoneware. ... 

Hg) to remove residual solvent. The glass casting plates were cleaned as previously described. 

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