CROMA-n Plus

Chromium Nitride

SMT   PVT LTD’s CROMA-n PLUS is a pharma grade CrN based wear and corrosion resistant hard coating deposited by the State-of-the-art physical vapour deposition (PVD) process.

CROMA-n PLUS coating provides superior performance and toughness compared to CROMA-n coating. CROMA-n PLUS has an intermediate Ti based layer which enhances the properties of the coating compared to CROMA-n. Incorporation of Ti layer in the coating structure makes it tougher and does not allow crack propagation to occur at the surface. Consequently, reduces the formulation picking chances, which restrict sticking. A hygroscopic formulation absorbs the moisture from the environment and triggers the stickiness during tablet compress. CROMA-n PLUS provides enhanced performance with its moisture repellent nature of intermediate layer not allowing formulation to stick on the surface. It provides perfect solution for the hygroscopic application by improving anti-sticking nature and toughness of the coating resulting in better quality and productivity. For Tablet tooling application, coating thickness in kept around 2 microns.

  CROMA-n Plus Properties

  • Hardness: 2000±400 HV
  • Oxidation Temp: 7000C
  • Surface Roughness (Ra): 0.1 µm
  • Friction coefficient: 0.55
  • Wear coefficient:5.5 x 10-14 m2/ N
  • Coating Structure: Multilayer
  • Colour: Silver-Grey


  • Good anti-sticking
  • Good toughness
  • Good wear protection
  • Good corrosion resistance
  • Superior oxidation stability
  • Biocompatible