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B-staging is a process that utilizes heat or UV light to remove the majority of solvent from an adhesive, thereby allowing a construction to be “staged”.In between adhesive application, assembly and curing, the product can be held for a period of time, without sacrificing performance.
Significant advances in understanding yellowing of epoxies were achieved by Down first in 1984 (natural dark aging) [44] and later in 1986 (high-intensity light aging). [45] Down investigated various room-temperature-cure epoxy resin adhesives suitable for use in glass conservation, testing their tendency to yellow.
The variation of G' and G" in time can indicate the extent of the curing reaction. [7] As shown in Figure 4, after an "induction time", G' and G" start to increase, with an abrupt change in slope. At a certain point they cross each other; afterwards, the rates of G' and G" decrease, and the moduli tend to a plateau.
When kept unopened in a cool, dry location such as a refrigerator at a temperature of about 55 °F (13 °C), the shelf life of cyanoacrylate will be extended from about one year from manufacture to at least 15 months. If the adhesive is to be used within six months, it is not necessary to refrigerate it.
Pre-preg also allows one to impregnate a bulk amount of fiber and then store it in a cooled area (below 20 °C) for an extended period of time to cure later. The process can also be time consuming in comparison to the hot injection process and the added value for pre-preg preparation is at the stage of the material supplier.
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J-B Weld (stylized as J-B WELD) is the name of their flagship product: a specialized, high-temperature epoxy adhesive for use in bonding materials together. The company has run advertisements showing engine block repair with J-B Weld. [2] The J-B Weld Company, founded in 1969 by Sam Bonham in Sulphur Springs, Texas, specializes in epoxy products.
The test complements the measurement of glass transition temperature, as an indirect measure of the degree of cure of a composite. It is inexpensive and quick, and provides information on the cure throughout a part. [1]