HR®-4 Retarder

HR®-4 cement retarder is a calcium lignosulfonate derived from wood. It can be used to retard all API classes of cement as well as Pozmix® cement.

HR-4 retarder is effective in wells with bottomhole circulating temperatures (BHCTs) up to 170°F (76.7°C). It can also withstand static temperatures up to 260°F (126.7°C). This broad performance range allows HR-4 retarder to be used in wells as deep as 12,000 ft.

Although HR-4 cement retarder has a dispersing effect on the cement slurry, it does not change slurry weight, volume, or water ratio. In addition, HR-4 retarder can provide the following benefits:

  • Extended pumping time
  • Early cement-strength development
  • More predictable thickening time
  • Improved slurry displacement rates at steady pressures
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