The multi-piston viscous filler market is projected to grow from USD 680.0 million in 2026 to USD 1,720.0 million by 2036, at a CAGR of 9.7%. High-viscosity & chunky products will dominate with a 50% market share, while servo-driven multi-piston fillers will lead the filler type segment with a 45.0% share.