Technical Product Bulletin
COLOR KEYED HIGH TEMPERATURE EPOXY ADHESIVE
AA-BOND F253 is a low viscosity, high temperature, two-part epoxy formulation that changes color during the curing process to indicate cure status. The unmixed components are light yellow; the mixture is green/blue; and the fully cured adhesive is reddish-amber. It exhibits excellent wicking, and develops strong, tough mechanically stable bonds to a wide variety of fiber optic and optical materials that includes most metals, ceramics, glass and many plastics. In addition, AA-BOND F253 has good impact and thermal shock resistance, demonstrates low stress, and yields excellent pot and polish connections. It is also resistant to water and weathering, vapors and gases, most petroleum products, and an extended range of organic and inorganic environments. An additional post-cure of 30 minutes at 150°C is recommended when application temperatures higher than 150°C are anticipated.
|Appearance||Unmixed - Ligh Yellow
Mixed - Greenish Blue
Cured - Reddish Amber
|Cure Type||Room Temperatue or Heat cure|
|Benefits||Good impact and thermal shock resistance
Demonstrates low stress
Yields excellent pot and polish connections
It is also resistant to water and weathering, vapors and gases
|Mix Ratio by weight||100:10 / Resin:Hardener|
|Substrates||Wide variety of fiber optic and optical materials that includes most metals, ceramics, glass and many plastics|
|Operating Temperature||-60 to 165 °C|
|Typical Application||exhibits excellent wicking, and develops strong, tough mechanically stable bonds to a wide variety of fiber optic and optical materials|
|Viscosity @ 25 °C||1800|
|Specific Gravity, mixed||1.19|
|Reactive solids contents, %||100|
|Pot Life||1 hour|
|15 minutes||@ 100°C|
|5 minutes||@ 125°C|
|1 minute||@ 150°C|
|Coefficient of thermal expansion ppm/°C||Below Tg – 2.03x1002
Above Tg – 6.24x1001
|Glass transition temperature (Tg), °C||116|
|Hardness, Shore D||88|
|Water Absorption, %||.004|
|Lap shear strength, psi||2700 (Aluminum to Aluminum)|
For safe handling information on this product, consult the Material Safety Data Sheet, (MSDS).
HOW TO USE:
1) Carefully clean and dry all surfaces to be bonded.
2) Apply AA-BOND F253 completely mixed adhesive to the prepared surfaces, and gently press these surfaces together. Contact pressure is adequate for strong, reliable bonds; however, maintain contact until adhesive is completely cured
3) Some separation of components is common during shipping and storage. For this reason, it is recommended that the contents of the shipping container be thoroughly mixed prior to use.
4) Some ingredients in this formulation provided may crystallize when subjected to low temperature storage. A gentle warming cycle of 52°C for 30 minutes prior to mixing components may be necessary. Crystallized epoxy components do not react as well as liquid components and should be re-dissolved prior to use for best results.
This epoxy can be supplied in various different packages.