FILCO® 661 S

FILCO 661 S is a bisphenolic, unsaturated polyester resin in powder form

• Very high molecular weight
• Very quickly soluble in styrene
• High binding power for glass fibers in "hot melt" operating conditions
• High degree of compatibility with unsaturated polyester matrices
• Higher flow rate than type 661
• Very good dispersability in water
• Higher resistance to agglomerate than type 661.

FILCO® 661 S main application

• Styrene soluble binder for chopped strand mat and continous filament mat
• Binder for preforms.

2,5 - 5% of FILCO® 661 S on the glass weight is normally required according to the weight for square meter and stiffness wanted for glass mat. Water as fine mist is sprayed to help FILCO 661 S to stick to glass fibers. After application of FILCO® 661 S the glass mat is stoved at 180 - 210 °C for 1 - 2 minutes. The operation lets water evaporate and melt FILCO® 661 S, which accumulates at the contact points of the glass strands, binding them.

FILCO® 661 S is supplied in fiber drums with polyethylene bag, net weight 120 kg

FILCO® 661 S should be stored in closed containers away from direct sun rays and source of heat, at temperature below 30°C. In these conditions, maximum suggested storage time is 12 months from production, in the original package. After that date the product must be rechecked.