Welchrom uses the same UHP (> 99.999% pure) Type B silica found in all Welch silica-based stationary phases. We combine it with bonding and endcapping steps exclusive to the Welchrom products to produce  phases with slightly different selectivity than Ultisil or Topsil. 


  • Excellent peak shape and low back pressure
  • Ultra high purity (>99.999%) Type B silica particles
  • New bonding and endcapping technique
  • Cost-effective


C18 with 17% carbon loading (USP L1). Stable in pH 1.5 – 10.

C8 chemistry (USP L7) with 11% carbon loading. Stable in pH 1.5 – 10.