Our search for a quality structural fiber that would not show in the surface led us straight to the manufacturer of PVA (Poly Vinyl Alcohol) fiber. RECS15, RECS100, RFD400 and RF4000 Create a covalent bond to the concrete creating an internal reinforcing that supersedes traditional methods. Added benefits include higher flexural strength, more impact resistance and greater resistance to both map cracking and plastic shrinkage. RFD400: 18mm fiber for GFRC backer, direct cast, and SCC applications. Good dispersion, great flowability at high dose. Used alone or in conjunction with other fibers.