The type dimension of Rupture Disc segmentation distinguishes products primarily by construction material and burst‑characteristics. Metallic discs, typically forged stainless steel or Inconel, dominate the high‑pressure, high‑temperature segment because their elastic modulus sustains precise burst pressures up to several thousand bar. Composite discs combine a metal carrier with a polymeric membrane, offering reduced inertia and lower cracking stress, which makes them suitable for moderate pressure ranges where rapid response is essential. Plastic discs, fabricated from PTFE or PVDF, are confined to low‑pressure, chemically aggressive environments due to their inherent corrosion resistance but limited burst‑pressure capability. A secondary classification separates single‑stage from dual‑stage designs; single‑stage units provide a single, fixed opening pressure, whereas dual‑stage discs incorporate a pre‑burst membrane that triggers at a lower pressure, followed by a main burst at a higher set point, thereby extending safety margins. Collectively, these type categories account for the full market volume, with metallic discs contributing roughly 55 % of global sales, composites 30 %, and plastics the remaining 15 %.