Introduction to the ALPHA Series

The Diamex ALPHA Series is a family of monolithic velour-type materials researched and developed to withstand the rigors of most primary polishing processes.

Sell sheets are available for the ALPHA 125-3EH - ALPHA 125-3EB Standard and ALPHA 125-5 Standard.

ALPHA 125-3EH - ALPHA 125-3EB Standard

This pad is utilized in polishing silicon wafers. It ensures higher polishing capacity and speed than the suede-type pads. Its three-dimensional pore structure ensures polishing without disturbing flatness and parallelism of materials to be processed. The ALPHA 125-3 Standard is extremely effective in providing taper-free wafers. This pad exhibits excellent hydrolysis resistance under high alkalinity and temperature conditions.

The Alpha 125-3EH material is closest to our original Alpha 125-3, which was discontinued two years ago.

The Alpha 125-3EB material is slightly coarser than the Alpha 125-3EH.

ALPHA 125-5 Standard

This pad is substantially the same structure and composition as the ALPHA-125-3-EH/EB, except it is harder and denser. The ALPHA 125-5 exhibits very low compression and elastic deformation. This pad is designed for better flatness at extremely high pressure.

Typical Physical Properties

  • Type
  • Thickness (inches)
  • Tensile Strength (kg/cm)
  • 10% Elongation wp
  • wf
  • 20% Elongation wp
  • wf
  • Abrasion loss (mg)
  • Compressibility (%)
  • Hardness (MOH-C)
  • Maximum Avail. Dia. (in.)
  • ALPHA 125-3EH/EB
  • 0.050
  •  
  • 6.3
  • 2.9
  • 10.6
  • 4.8
  • 11.5
  • 2.67
  • 68/70
  • 54
  • ALPHA 125-5
  • 0.050
  •  
  • 9.7
  • 6.6
  • 14.6
  • 9.1
  • 1.5
  • 1.36
  • 76/78
  • 54

Chemical Properties

  • Type
  • Acid Resistance
    (Hydrochloric Acid)
  • Alkali Resistance
    (Caustic Soda)
  • Heat Resistance
    (Softening Point)
  • ALPHA 125-3EH/EB
  • pH (1-7)
     
  • pH (7-13)
     
  • 190°C
     
  • ALPHA 125-5
  • pH (1-7)
     
  • pH (7-13)
     
  • 190°C