• Overview
  • Packaging
  • FAQs
  • Advantages
  • Resources

When concrete experiences damage and require repairs, non-shrink grout provides an excellent solution. Non-shrink grout is a type of cement-based grout specially formulated not to shrink as it sets. Typically these types of grout mixes require some sort of grout admixture. Fritz-Pak’s NS-7 produces a more uniform non-shrink grout with less water and extended set times.

How Does Our Grout Admixture Work?

When NS-7 mixes with water, it starts producing hydrogen gas that causes the mix to expand. The expansion of the gas continues as it sets up, overcoming any shrinkage that might occur within the mix. Additionally, NS-7 increases the flow of the grout mix to ensure that it fills every crevice and leaves behind no voids.

When Do You Need a Grout Admixture?

Non-Shrink grout is typically used to repair voids in formwork, ICF structures, and other concrete projects that are prone to experiencing honeycombing. When properly mixed, the grout flows in and fills the void and then hardens to increase the durability of the building project. If there is any shrinkage as the grout dries, it could compromise the integrity of the repair. That is why having a non-shrink grout admixture like NS-7 is so important.


If you have questions about using NS-7 as your non-shrink grout admixture, you can contact us for technical assistance at (214) 221-9494. You can also request a free no-obligation sample through this website. Don’t forget to follow Fritz-Pak’s social media pages to learn more about all our products.

9708042 lb. (19 kg.) paper bag60
970811 lb (454 g.) water soluble bag3042
How does NS-7 work and produce a nonshrink grout?
It contains an ingredient that generates gas and produces expansion. Expansion occurs before set in order to fill all voids and cavities.
Is the expansion desctructive?
No. Since the expansion is made by gas, it will not be strong enough to break any forms.
Is there any expansion after setting?
What type of gas is generated?
Are there any special guidelines for the application of non-shrink grouts made with NS-7?
Generation of gas starts within 5 minutes of adding water and will continue for approximately 1½ hours. The sooner the grout is placed, the greater the expansion it will give. The grout should not sit more than 1½ hours before it is used.
Does NS-7 work with calcium aluminate cements?
Yes. It is also effective with fast set cements
Does NS-7 contain a water reducer?
For grouts made with NS-7, do I follow standard concrete testing procedures?
No. Compressive strength needs to be tested using restrained cylinders or molds. If not done this way, compression strengths will be lower. See ASTM C 1107 for further reference.
Can I use NS-7 for block fill material?
What are the standards for NS-7?
NS-7 is used to produce non-shrink grouts. It is the grout produced that needs to conform to the specifications. With NS-7 you can produce grouts that conform to ASTM C 1107, Grade "A" Pre-Hardening Volume-Adjusting.
What are the best applications for NS-7?
NS-7 is used to prepare non-shrink grouts used in block filling, hollow core filling, ICF grouting, back filling in tunnels, back filling of pipes and in general for filling voids were low to moderate strengths are required.
  • Increased compressive, shear and bond strength
  • Increased water retention
  • Reduced water requirements
  • Extended working life
  • Higher strengths may be achieved more economically
  • Easily adaptable to leaner mixes
  • Improves grout workability with no loss in strength
  • Expansion provides better contact with surrounding surfaces
  • Improves water-tightness by reducing cracks and cold joints
  • Improves cohesiveness and decreases bleeding and segregation
  • Reduced time and labor costs for placement
  • Allows ease of placement in difficult areas such as high density steel reinforcement


NS-7 is compatible with all air-entraining admixtures, calcium chloride and other admixtures. When used with other admixtures, each one must be dispensed separately into the mix.