MavJoint JF Polyurea Joint Filler
MavJoint JF is a fast-set, semi-rigid polyurea used for filling control and construction joints in concrete floors. This high-performance system is mixed and applied via a dual cartridge mechanism or plural mixer. The high solids, low odor system offers a large shave-time window and provides better UV resistance than many other polyurea joint fillers.
MavJoint JF: Polyurea Joint Filler
MavJoint JF reduces spalling of joint edges caused by heavy loads and wheel traffic. This protection is provided by support of the filled joint, which is very different from the extreme flexibility and low strength of a joint sealant.
The material is supplied in dual-component 22 oz. cartridges in six standard colors, and in tintable 10-gallon kits for plural-component dispensing equipment. It is installed to full depth, slightly overfilled, and shaved flush with the surrounding concrete as soon as 30 minutes after placement.
Where it fits: MavJoint JF is a stand-alone semi-rigid filler for control and construction (sawcut) joints in concrete floors; it is not a flexible joint sealant and is not used in joints that move.
Every figure on this page is taken from the MavJoint JF product data sheet. Open the product data sheet for the complete application instructions.
Features and Benefits
- Fast setting formula
- Protects joints from debris and damages from heavy traffic
- High solids, low odor
- Self-leveling, low viscosity system
- Wide application and service temperature range, including freezer applications
- Low temperature applications as low as -25°F (-32°C)
- No foaming or bubbling in damp joints
- Excellent performance properties
- Large shave-time window
- Complies with ACI 302 regarding control and construction joint fillers
Read Before Specifying
- Do not fill joints that move with a rigid joint filler; use a joint sealant
- Do not fill joints in concrete that is < 28 days old; 90 days is preferred due to significant concrete shrinkage from water loss
- Do not fill joints in spaces that are not stabilized to operating temperatures and humidities
- Do not fill joints during months when the lowest or highest temperatures of the year occur, as concrete will be expanded or contracted and joints will be extremely narrow or wide
- Do not fill joints that are not prepped
- Do not use at conditions not recommended
MavJoint JF Published Data
Values below are reproduced from the current MavJoint JF product data sheet dated 10/10/2026. Request project-specific values through the data sheet.
| Property | Value |
|---|---|
| Components | 2 (Base + Activator) |
| Color | Haze Gray |
| Solids Content | 99% |
| Mix Ratio (by volume) | 1 : 1 |
| Gel Time (100 gram mass @ 72°F (22°C)) | 45 – 50 seconds |
| Viscosity | Base – 2400 cPs, Activator – 1200 cPs |
| VOC (EPA Method 24) | 10 g/L |
| Air Temperature | -25° – 120°F (-32° – 49°C) |
| Surface Temperature | -25° – 120°F (-32° – 49°C) |
| Material Temperature | 60° – 85°F (16° – 29°C) |
| Property | Test Method | Result |
|---|---|---|
| Adhesion to Concrete | ASTM D4541 | 275 psi (1.9 MPa) |
| Elongation | ASTM D412 | 242% |
| Shore A Hardness | ASTM D2240 | 91 |
| Tensile Strength | ASTM D412 | 1642 psi (11.3 MPa) |
| Condition | 72°F (22°C), 50% RH |
|---|---|
| Tack Free | 12 – 15 minutes |
| Shave Time | 30 minutes to 4 hours |
| Light Traffic | 1 hour |
| Heavy Traffic | 2 hours |
- Theoretical coverage: Approximate coverage in linear ft./gal (m/L) by joint width and depth. 1/8" (3.2 mm) wide: 103' (8.2 m) at 1.5" depth, 77' (6.1 m) at 2" depth, 62' (4.9 m) at 2.5" depth. 3/16" (4.8 mm) wide: 68' (5.4 m), 51' (4.1 m), 41' (3.3 m). 1/4" (6.4 mm) wide: 51' (4.1 m), 39' (3.1 m), 31' (2.5 m). 3/8" (9.5 mm) wide: 34' (2.7 m), 26' (2.1 m), 21' (1.7 m).
- Packaging: Dual component cartridges, 22 oz. (600 mL), in six colors. Tintable 10 gallon (37.9 L) kits in Neutral, consisting of a 5 US gal (18.9 L) Tintable Base (Neutral) and a 5 US gal (18.9 L) Activator (Amber/Brown).
- Colors and finish: Cartridge colors: Concrete Gray, Black, Intellectual Gray, Dovetail, Gauntlet Gray and Warmstone. 10 gallon kits are tintable Neutral.
- Shelf life and storage: 12 months from date of manufacture when stored indoors in the original unopened container at 60°F – 85°F (16°C – 29°C) in a dry location with humidity below 65%. Do not allow materials to freeze.
Substrate Requirements
Concrete should be a minimum of 28 days old. Joints must be clean, dry and free of all contaminants such as dirt, dust, grease, paint, oil and other foreign materials. Preferred methods of joint cleaning include using a dustless concrete saw with a diamond blade or sandblasting. Remove all residues and debris using a HEPA filtered vacuum cleaner or oil-free air compressor. Joints should be clean and dry before application to ensure best adhesion to concrete.
Mixing and Installation
MavJoint JF is mixed 1 part Base to 1 part Activator by volume and dispensed with a 1:1 ratio dual component manual or air gun, or 1:1 dual-feed power dispensing equipment, through a 1/2" diameter static mixer with 30 or 32 elements. Material in pails should be thoroughly premixed at low speed with a drill and paddle before the base and activator are combined in a plural mixer, without whipping air into the material; prefilled cartridges should be shaken for two minutes before use. Install to full depth and slightly overfill the joint so it can be shaved flush with the surrounding concrete, taking care not to trap air bubbles. Shaving can be done as soon as 30 minutes depending on surface and air temperature; always use a sharp blade for a smooth finish. Air and surface temperatures may range from -25° to 120°F with material at 60° – 85°F; higher temperatures shorten work time. Periodically inspect filled joints for separation or damage and repair to prevent further damage.
Full step-by-step instructions, pot life and recoat windows are in the MavJoint JF product data sheet. Maverick installs MavJoint JF with its own crews.
Used With MavJoint JF
MavJoint JF belongs to Maverick's Joint Fillers & Sealants line. See the full product catalog or the PDS Library for every data sheet.
Specifying MavJoint JF?
Maverick engineers, manufactures and installs the system. Send the drawings and we will return a scope, a build-up and a quote.