a polyurethane system, the isocyanate (component A) and polyol
(usually a polyol blend) (component B) are supplied in a prepackaged
formulation, or system. The system may also include color additive.
The polyurethane system is ready to be processed into the polyurethane
part. Polyurethane systems generally are supplied in traditional
drums or in returnable intermediate bulk containers (IBCs). Some
polyurethane systems are supplied in bulk via tank trucks.
degree of rigidity usually defines a polyurethane system, placing
it in one of two categories – rigid or elastomeric.
- A rigid polyurethane system
generally has a higher flexural modulus and degree of hardness.
This category of materials normally offers good thermal resistance,
electrical properties, chemical resistance, and acoustical insulation.
For example, rigid polyurethane foams are used to insulate residential
and commercial buildings.
elastomeric polyurethane system is often found in applications
requiring superior impact strength. Elastomeric polyurethane
systems exhibit good toughness and dimensional stability throughout
a wide temperature range and have excellent corrosion, abrasion,
wear, and cut resistance. Elastomeric polyurethanes are used
to make inline skate wheels, footwear soling and bushings
and vibration pads for industrial machinery.
these two categories, there are three types of polyurethane systems:
polyurethane systems – use a blowing agent to make parts with
a higher-density skin and a lower-density, microcellular core
in a sandwich-like composition. They are commonly referred
to as foamed RIM. Applications for these materials include
business machines, electronic and medical housings, automobile
spoilers, skis, and other load-bearing applications.
polyurethane systems – do not use blowing agents, resulting
in a homogeneous, rigid or elastomeric plastic. They are commonly
referred to as reinforced RIM or RRIM. Applications for these
materials include automotive, specialty transportation, construction,
agriculture, and recreational industries.
composite polyurethane systems – are solid or foamed materials,
molded in combination with long-fiber reinforcements, such
as preformed glass fiber mat or chopped glass fibers, to improve
the mechanical characteristics. These systems have extremely
high stiffness and high impact strength because of the glass
fiber reinforcement. They are commonly referred to as structural
RIM or SRIM. Applications for these materials include automotive
door panels, package shelves and load-bearing panels, and
recreational equipment parts. These
polyurethane systems are finding many new uses in the composites
offers a wide range of polyurethane systems in North America.