A brief guide for choosing your Rotary Ejection Rubber:
G-257 or 12300/22300 (gray): the gold (ok, gray) standard for rotary die cutting ejection-rapid recovery, and economical. G-257 is closed cell and 12300/22300 are neo/micro-cell.
RD-73 or Red Rhino (red): Firm ejector used in both rotary and flat die cutting for a wide range of substrates.
6118 or 06500 (red): Firm ejection rubber used for corrugated or thicker substrates. Both are open cell.
F-70 (pink): Firm, economic ejector used for both corrugated cartons and thicker substrates. Open-cell.
Dura-Bull or Super Strip (white/tan): Popular slot ejector in both flat & rotary die cutting. Use sparingly.
MR-40 (white): Firm neo/micro cell ejection material.
BK-85 (black): High density, resilient ejector used in slots or tightly ruled areas of a die. Also good as a trim breaker.