High Performance
Polyurethane Casting Systems
Solid/Non-Foam Casting
Resins
Different Classes of Polyurethane Casting Resins
High performance polyurethane casting systems can be
categorized by bass polyols used in the system. The most commonly used base
polyols for high-performance class polyurethane casting materials
are polyester and polyether polyols.
Polyester based polyurethane casting systems
in general have products that has higher tensile strength, cut/tear
resistance, low rebound, and good oil resistance. The
price for this type of formulations are lower than high-performance
polyether base polyurethane systems. Typically, this type of
formulation is not recommended for applications with high degree of
water contact.
List of
Polyester-Base Polyurethane Elastomer Casting Systems
High performance polyether base polyurethane casting
systems use a specific type of polyether polyol called PTMEG. PTMEG
polyether base systems have good tensile elongation, high rebound
and superior abrasion resistance property against sliding abrasion
forces.
List of Polyether-Base Polyurethane Elastomer Casting
Systems
"Full-Prepolymer" System or "Quasi" System
High performance casting systems can also be
categorized by the formulation style. Traditionally,
high-performance class casting resins are formulated with
"full-prepolymers", which is the one of the two components is a low
NCO isocyanate prepolymer and the other is short chain curing agent
to cure the material. This formulation style is proven for a
good range of applications for many years.
However, the recent studies show that for certain
range of formulations, "quasi" style of formulating works better.
A "quasi" style formulations uses a high NCO isocyanate prepolymer
and larger chain curing agent. As a "full-prepolymer" has
higher viscosity, "quasi" systems can have both prepolymer and
curing agent within a low viscosity range at an elevated
temperature. This helps well-mixing of the components; in
result, the physical properties of the quasi system is more
enhanced. Quasi formulations have an advantages in softer
range casting materials.
Prepolymer Product Index