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Rovene 4201 is a self-crosslinking, carboxylated styrene-butadiene emulsion that has a stiff or ‘boardy’ hand. This binder is recommended for durable nonwovens such as floor maintenance pads and roof shingle mats, both glass and organic. Rovene 4201 may also be used in coatings where a very hard binder is needed. Rovene 4201 does not film form under ambient conditions but will fuse into a film at temperatures above 120° F. The latex may be crosslinked with melamine formaldehyde resins to form a very hard nonblocking film.