Dear Readers,
This is
continuation of my previous post of “Introduction of FRP Pipe.”
Fiberglass
reinforced plastic (FRP) laminates are manufactured with thermosetting
polyester or Vinyl ester resins and various types of fibrous glass reinforcing.
The fiberglass reinforcement is thoroughly saturated with catalysed resin to
form a dense laminate with the required physical and chemical resistant
properties.
In general, the
glass reinforcing provides the strength to the laminate and the resin binder
provides the shape and chemical resistance. To achieve optimum chemical and
abrasion resistance, all laminates are composed of an Inner surface, an Interior
layer, a Structural layer, and an Outer Surface layer.
The combination
of inner surface and interior layer is often referred to as the Liner or
Corrosion Barrier and is generally considered to contribute structural
strength as well as corrosion resistance to the laminate.
Summary of
Laminate Structure as follows.
Liner / CBL (Corrosion Barrier Layer or Chemical Barrier Layer)
Structural Layer
Top Layer or Surface Layer
Inner Surface
- This surface is exposed to the cursive environment and is composed of
resin reinforced glass veil or a synthetic veil.
Interior
Layer - This portion of the laminate is composed of multiple layers of
chopped strand fiberglass reinforcement.
Structural
Layer - This layer is primary structural portion of the laminate and is
designated to withstand the loads caused by pressure, wind, seismic and other
conditions. It consists of alternating layers of chopped strand and Woven Roving
to the required thickness.
Outer Surface
Layer - This surface is a resin coating formulated to be non-air inhibited
and fully cured. When exposed to the environment, this coating contains
ultraviolet absorbers or pigments to minimise ultraviolet degradation.
