Unbonded Concrete Cylinder Capping Pads and Sets

Unbonded Capping is a safe, accurate, and economical alternative to the use of hot sulfur capping compound for compressive strength tests of concrete specimens. Steel Retainer Rings hold tough 0.5in (12.7mm) thick neoprene pads at each end of the concrete test cylinder to distribute compressive load forces evenly. Retainers last for years with proper care, and Neoprene Pads are reusable for up to 100 tests. Neoprene Pads and Steel Retainers are sold separately. Retainers and Pads for 2in (50.8mm) specimens are also suitable for use on 2.125in (54mm) diameter rock cores.


Unbonded Concrete Cylinder Capping Pads
  • Neoprene Pads are available in 2, 3, 4, and 6in diameters and used in the unbonded capping of same diameter concrete cylinders during compression testing. The 0.5in (12.7mm) thick pads can be reused in up to 100 tests and are secured at each end of the specimen by a steel retainer ring, sets sold separately. Select from pads in 50, 60, or 70 durometers.
  • Steel Retainer Sets are steel retainers in 2, 3, 4, and 6in diameters used to secure neoprene pads, sold separately, at both ends of a concrete cylinder specimen. Precision machined retainers are constructed of steel alloy. Available in sets of two.
  • Unbonded Capping Accessories include a 48oz polysaccharide powder or 8oz powder dispenser sold as separate products, or a powder kit that includes one each of both powder and dispenser. The powder is used to quickly break the bond between the pad and steel retainer and allow safe and intact removal of the specimen.

For more information on Unbonded Concrete Cylinder Capping Pads and Sets, here are our related blogs: