Light insulating glass extendable ladder patent application No.：200621027669.8 Characteristic： using epoxy resin to produce light, portable and durable, affordable 200 kg per meter impact.
comment:
We wonder if similar ladders are reliable? Glass fiber reinforced polyester composites may undergo chemical and physical aging. The durability is governed mainly by the matrix degradation. The mechanical property reduction is not induced only by hydrolytic aging but rather by the formation of cracks due to moisture swelling, stress or temperature. That is the reason why it became of major interest to understand the microcrack nucleation mechanism in neat matrices, to study the crack propagation, and to evaluate the incidence of cracking on the tensile propery loss.
Tags: CN, fiberglass