Key Takeaways
- The first step in choosing crack injection equipment is determining whether the material is single-component or plural-component.
- Plural-component materials require equipment that can accurately meter and mix the material at the manufacturer-specified ratio.
- Material viscosity, required working pressure, and jobsite conditions all influence which injection pump is appropriate.
- Higher pressure may be required for certain pressure grouting, drilled packer, high-viscosity, thick-structure, or water-bearing applications, but some foundation crack repairs are intentionally performed at low pressure.
- Using the wrong pump can result in poor mixing, incomplete crack filling, wasted material, equipment downtime, and costly repairs.
- Contractors should evaluate the material data sheet, required mix ratio, viscosity, pot life, pressure range, hose layout, cleanup process, maintenance requirements, and long-term serviceability before selecting an injection pump.
Table of Contents
- Why Pump Choice Matters in Crack Injection Work
- Start With the Material: Single-Component vs. Two-Component Systems
- How Mix Ratio Affects Pump Selection
- How Material Viscosity Changes Equipment Requirements
- Pressure Requirements and Site Conditions
- Comparing WIWA 14015 vs. WIWA 14025 Injection Pumps
- Common Problems When Contractors Use the Wrong Pump
- Selection Checklist for Crack Injection Equipment
- How Bolair Helps Contractors Choose Injection Equipment
- FAQ About Crack Injection Pumps and Mix Ratios
Crack injection and pressure grouting jobs may involve single-component or plural-component injection materials, each with different equipment requirements. Contractors need to understand what type of material they are using, how it must be mixed, and what type of pump is required for the application.
Your choice in a crack injection pump will depend on the type of material you’re using, the specified mix ratio of that material, the viscosity and pressure needs of the material, and whether it needs to be mixed at the time of application. In pump-based crack injection work, plural-component materials generally require equipment that can accurately meter and mix each component at the required ratio, while single-component materials can often be handled with simpler injection pump setups. Contractors should also understand that a 1:1 injection pump is a type of plural-component pump, not a separate category.
Why Pump Choice Matters in Crack Injection Work
Waterproofing, foundation repair, and crack filling are all specialty applications that require compatible injection materials, such as epoxy resins, acrylic gels, grouts and polyurethane resins or foams. These materials require compatible crack injection equipment selected around the material’s mix ratio, viscosity, working pressure, pot life, and application conditions. Some crack injection materials require only SST wetted fluid parts. Failing to use compatible equipment can result in a range of problems at the jobsite, including:
- Poor or incomplete mixing, leading to material that doesn’t cure.
- Inconsistent material delivery, leading to gaps in coverage.
- Wasted material, resulting in more expensive operating costs.
- Incomplete crack repairs that don’t hold or perform as intended.
Start With the Material: Single-Component vs Two-Component Systems
Crack injection and waterproofing contractors need to select the right equipment around the material first. Start by confirming whether the material is single-component or plural-component. A single-component material or a material that can be applied with a single component injection pump is typically supplied as a main material with an extra accelerator component that is added to the main component and mixed prior to pumping , while a plural-component material requires two components to be combined at a specific ratio before or during application. The material data sheet should always guide the final equipment choice.
Many contractors get confused about the difference of 1:1 plural component pumps vs other plural component systems. A 1:1 injection pump is a plural-component pump designed to deliver two materials in equal proportion. Other plural-component systems may be configured for different fixed ratios depending on the material manufacturer’s requirements.
When a Single-Component Pump May Be Enough
A single-component pump may be enough when the injection material is supplied ready to pump and does not require on-ratio metering of two separate components. This can apply to certain polyurethane leak-sealing materials, depending on the manufacturer’s instructions, application method, and required pressure. These machines are typically simpler than plural-component systems and can be suitable for certain crack injection or waterproofing jobs.Keep in mind that a single component material often has another component that is added to it by hand mixing, then put in the single component pump hopper. In some cases, the resulting material will not cure until it comes in contact with water or moisture.
When Plural-Component Injection Equipment Is Needed
Plural-component injection equipment is needed when the material must be metered and mixed at a specific ratio during application. In production crack injection or pressure grouting work, this helps maintain consistent ratio control, mixing accuracy, and material performance.
When selecting between a 1:1 injection pump and another injection setup, always refer to the material specifications. If the material requires strict 1:1 metering, use equipment designed to deliver both components at that ratio. Dedicated WIWA 2K injection pumps are designed to meter and deliver two components at a fixed 1:1 ratio, while hopper-based or modified injection setups should only be used when they are compatible with the material’s mixing, ratio, pressure, and handling requirements.
How Mix Ratio Affects Pump Selection
Plural-component materials are not applied as a single ready-to-use product. They require two components to be combined at the correct proportion before or during injection so the material can cure and perform as intended.
Plural-component materials can require a variety of different ratios. Some require a 1:1 ratio, while others may require 2:1 or another manufacturer-specified proportion. Correct metering helps ensure the material is delivered, mixed, and cured as intended.
How Material Viscosity Changes Equipment Requirements
Beyond single-component or plural-component designations, material viscosity has a major impact on pump selection. Viscosity affects how easily material moves through the pump, hose, mixer, manifold, and injection port.
Higher-viscosity materials may require greater pressure capability, shorter or properly sized hose runs, larger material passages, and equipment designed to maintain consistent material flow. For example, the WIWA 14025 is described with large material inlets and check valves for viscous materials, making it better suited to demanding injection and pressure grouting applications.
Pressure Requirements and Site Conditions
After confirming whether the material is single-component or plural-component, consider the required injection pressure and the jobsite conditions. Pressure requirements depend on the material, crack width, structure thickness, injection method, port or packer setup, hose layout, and whether the work involves residential foundation repair, leak sealing, curtain injection, or pressure grouting. These applications could include:
- Certain water-bearing or actively leaking cracks
- Drilled packer applications
- Long crack runs.
- Thick concrete sections.
- highly viscous materials.
Always compare the material’s recommended pressure range against the pump’s maximum fluid working pressure, output, hose setup, and injection method.
Comparing the Wiwa 14015 and 14025 Injection Pumps
For contractors comparing WIWA injection pumps, the 14015 and 14025 are both 1:1 pneumatic 2K piston pumps, but they are not identical in capacity or intended use. The 14015 is the more compact option with a lower listed maximum pressure, while the 14025 offers higher listed pressure, viscous-material handling features, stainless material-contact parts, and a flushing pump for cleaning the A and B components in the mixing block.
| Common Materials | Common Job Types | Best For | |
|---|---|---|---|
| WIWA 2K 1:1 INJECT MODEL 14015 | 1:1 reaction resins, acrylic gels, epoxy’s | Crack injection, leak sealing, void filling, and building repair | Compact 1:1 injection applications where portability and a lower maximum pressure range are suitable. The WIWA 14015 is listed as a pneumatic 2K piston pump with a 1:1 mixing ratio and 120 bar maximum pressure. |
| WIWA 2K 1:1 INJECT MODEL 14025 | 1:1 reaction resins, silicate resins, injection foams, acrylic gels, methacrylate gels. | Basement waterproofing, injection, cavity filling, sewer rehab, tunnels, civil work. | More demanding 1:1 injection and pressure grouting jobs requiring higher pressure, viscous-material handling, stainless material-contact parts, and flushing support. The WIWA 14025 is listed as a 1:1 pneumatic 2K piston pump with 200 bar maximum pressure. |
Common Problems When Contractors Use the Wrong Pump
Choosing the wrong crack injection pump for your application can compromise material mixing, delivery, curing, and repair performance.
At the equipment level, the wrong pump can lead to poor ratio control, inconsistent mixing, clogged lines, difficult cleanup, or material waste. Within the repair area, it can result in incomplete crack filling, poor curing, weak bonding, or reduced waterproofing performance. Operationally, this can mean extra labour, downtime, lost material, and avoidable callbacks.
Selection Checklist for Crack Injection Equipment
Take the following steps when researching crack injection and pressure grouting equipment:
- Confirm whether the material is single-component or plural-component.
- Review the material data sheet for required mix ratio, viscosity, pot life, and pressure range.
- Confirm whether the material requires a specific mixer, manifold, static mixer, or flushing process.
- Consider the repair type, structure thickness, crack condition, and size of the job.
- Plan hose length and hose diameter around jobsite layout and material flow requirements.
- Confirm whether the application uses surface ports, mechanical packers, or another injection method.
- Review cleanup requirements, ease of operation, parts availability, and long-term serviceability.
How Bolair Helps Contractors Choose Injection Equipment
Choosing the right equipment for a crack injection, waterproofing, or pressure grouting job is not always straightforward. That’s why Bolair acts as a technical partner for contractors who need help matching material requirements to the right pump setup.
Our team can review your material type, mix ratio, viscosity, pressure requirements, application method, hose layout, and cleanup needs to help recommend a suitable crack injection pump or pressure grouting setup. Contact Bolair today to discuss your application. Contact us today to get started.
FAQ About Crack Injection Pumps and Mix Ratios
What is the difference between a single-component and a plural-component injection pump?
A single-component pump is designed for materials that are ready to pump without on-ratio mixing. A plural-component injection pump is used when two components must be accurately metered and combined during application to achieve the required curing and performance.
How do I know which crack injection pump I need?
Start by reviewing the material manufacturer's data sheet. The correct pump depends on whether the material is single or plural-component along with the required mix ratio, viscosity, pot life, working pressure, hose setup, and type of crack repair, waterproofing, or pressure grouting application.
Why is mix ratio important for crack injection?
The correct mix ratio helps ensure the material cures properly and achieves its intended adhesion, strength, flexibility, expansion, or waterproofing performance. Incorrect ratios can lead to poor curing, weak repairs, wasted material, or equipment problems.
How does material viscosity affect pump selection?
Higher-viscosity materials may require equipment with greater pressure capability, larger material passages, suitable hose lengths, and a mixer or manifold setup that can maintain consistent flow.
When is higher-pressure injection equipment necessary?
Higher-pressure equipment may be needed for thick concrete sections, drilled packer applications, long crack runs, certain water-bearing cracks, high-viscosity materials, curtain injection, or larger pressure grouting jobs. However, some foundation crack repairs are intentionally performed at low pressure, so the correct pressure depends on the material, structure, and injection method.
What is the difference between the WIWA 14015 and WIWA 14025?
The WIWA 14015 is a compact 1:1 pneumatic 2K piston pump with a lower listed maximum pressure, stainless steel material- contact parts, making it suitable for portable 1:1 injection applications. The WIWA 14025 is also a 1:1 pneumatic 2K piston pump, but it offers higher listed maximum pressure, viscous-material handling features, stainless material-contact parts, and a flushing pump, making it better suited for more demanding injection and pressure grouting work.
What happens if I use the wrong crack injection pump?
Using the wrong equipment can result in inaccurate mix ratios, poor mixing, poor material delivery, incomplete crack filling, clogged hoses, difficult cleanup, excessive material waste, downtime, and repairs that do not perform as intended.
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