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RRIM
BACKGROUND
Reinforced Reaction Injection Molding (RRIM) describes a method often seen in automotive applications. This method differs from conventional injection molding in that polymerization, via a chemical reaction, occurs in the mold as opposed to melting and cooling to form a solid polymer. RRIM is further characterized by inclusion of reinforcement additives to provide improved physical properties.
PRODUCTS FOR SELECTION:
EXPECTED OBSERVATIONS
All noted reinforcing fillers would increase flexural modulus about three times over unfilled resin.
Addition of 10% to 15% by weight of milled glass fibers prevents waviness in long thin parts. Fibrous fillers can have more anisotropy.
Platy particles, such as mica, will orient flat to the flow thus controlling warpage.
Proper selection of surface treatments can be critical to improving adhesion to the matrix.
SUGGESTED LOADINGS
Product: Weight %
Microglass: 15 - 25
Wollastonite: 15 - 22
Muscovite Mica: 6 - 8
Microwool: 15 - 20
COMMENTARY
Applications can vary. Contact Fibertec for discussions on specific product grades and surface treatments to achieve desired end results.
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