Constructed from an open-cell ester-based polyurethane
  medical grade foam. 100% fibre-free and will not interfere
  with the curing of elastometers and adhesives used in
  Aerospace and medical applications. Widely applied to the
  cleaning of metal masks used to print thick film resistors
  and hybrid circuits. Enables excess paste to be thoroughly
  removed while minimising abrasion damage to the
  emulsion.

• Soft sponge-like construction minimises abrasion to metal
  mask emulsions.
• Low density foam makes it perfect for scratch sensitive
  surfaces.
• Certified non-cytotoxic and lot traceable to comply with
  FDA standards.
• Available in various sizes