Polyester resin
H520-B AOC

Altek® H520-B is a prepromoted, thixotropic, general purpose low reactive orthophthalic polyester resin.
The low exotherm of Altek H520-B allows for the application of thick laminate sections that can cure at one time without the generation of excessive heat.
Altek H520-B provides good chemical bonding between laminate application if proper application procedures are followed.
When used with the proper glass reinforcement content, AOC's Altek H520-B produces a composite with superior mechanical properties that can assist in the reduction of cracking.
Resin color changes from blue to neutral after addition of peroxide. This color change provides a visual assurange to the fabricator that the peroxide has been mixed with the resin.