buna rubber(n = noun.substance) buna - made by polymerizing butadiene;
is a kind of rubber, synthetic rubber
assam rubber, buna, butyl rubber, cold rubber, crepe rubber, foam rubber, hard rubber, india rubber, mistletoe rubber plant, natural rubber, par'a0 rubber, para rubber, para rubber tree, rubber, rubber band, rubber boa, rubber boot, rubber bullet, rubber cement, rubber eraser, rubber plant, rubber stamp, rubber tire, rufous rubber cup, silicone rubber, synthetic rubber