Please Sign In to display your prices

Prime Flex 920 Water Activated Resins 5 Gallon

PRI 920P 5G
Price Add to Cart
$452.47 EA

Prime Flex 920 is a single-component polyurethane injection resin used to seal gushing leaks, including wide gaps in concrete, where the structure is not subject to movement. This hydrophobic, super low viscosity polyurethane reacts with water and expands to form a closed cell, watertight, rigid foam. Due to its low viscosity, 920 is also used for permeation grouting of loose soils to consolidate soil particles and increase the load-bearing capacity. This product is independently tested and verified to meet NSF/ANSI Standard 61 for contact with potable water.

Recommended Uses:

  • Injection of gushing water leaks in below-grade structures
  • Injection of loose soils for stabilization
  • Curtain grouting manholes, pipe joints, tunnels, etc.
  • Point grouting

Typical Areas of Use:

  • Sealing leaks and wide gaps in concrete. Examples:
    • Box culverts, tunnels (subway, water, utility, etc.)
    • Manholes, sanitary and storm pipes/structures
  • Curtain grouting below-grade structures. Examples:
    • Parking decks
    • Manholes
    • Foundations and basements
  • Permeation grouting for soil stabilization. Examples:
    • Roads and highways
    • Seawalls and retaining walls
    • Sinkhole perimeters (not filling the sinkhole)


  • NSF/ANSI Standard 61 compliant for potable water contact
  • Cheaper and less disruptive than replacement
  • Super low viscosity: penetrates into fine areas
  • Pumped as a single component
  • Available in convenient cartridges
  • Up to 2900% expansion (unconfined)
  • Variable reaction (set) times
  • Meets Fla. DOT specification for soil injection of chemical grouts
  • Watertight on gushing leaks

Mix Ratio & Procedure:

  • Use reaction times guide below to determine amount of Prime Kat or Kick Fast catalyst to add to the 920. One 33 oz. bottle per 5 gallons of 920 equals 5% mix ratio. Two 33 oz. bottles is the maximum dose at 10%. Only mix the amount of material that can be used within 12 hours. Thoroughly mix materials using a low speed drill with a mixing paddle. Hand mixing will not be sufficient and will result in underperforming material. Once catalyst has been added, the 920 will react upon contact with moisture

Material Preparation:

  • Store material overnight to precondition to between 70 and 80ºF (21 and 27ºC) prior to use. If using less than a full pail, pre-mix material prior to adding Prime Kat.


  • Cold temperatures will slow down reaction time and increase viscosity. pH below 3 or above 10 may adversely affect foam properties.


  • Store in dry environment between 40 and 80ºF (4-27ºC).

Shelf Life:

  • 18 months from date of manufacture in unopened containers properly stored.

Typical Data:

  • Physical Properties at 73 ºF (23ºC) - Liquid


Tensile strength ASTM D-1623 41 psi
Tensile elongation ASTM D-1623 3.4%
Shrinkage  ASTM D-1042 / D-756 none
Compressive strength (with fine sand) ASTM C-39 1027 psi; 147,888 psf
Reaction times 73ºF (23ºC)    

Link to SDS information

Pending Reviews