3004 Pen Joint Polyurea
3004 Pen Joint is a slow-set aromatic polyurea designed for interior control joints and minor concrete repairs. This two-part, 100% solids product is self-leveling and ideal for hand-mixed or machine-dispensed applications in environments with short downtime and temperature limitations.
Advantages
- USDA-compliant.
- Rapid application and set times (gel time: 5–8 minutes at 77°F).
- Suitable for cold applications (-20°F).
- “Drive-over” ready in 20–30 minutes.
- Excellent abrasion and impact resistance.
- Chemical-resistant, non-flammable, and moisture-tolerant.
- No VOC, no odor, self-leveling.
Unique Characteristics
- Low viscosity enables deep penetration and “nano-locking” into joint walls.
- Quick-setting; grindable and scrapable within minutes.
- Remains durable without becoming brittle over time.
- Ideal for continuous-operation facilities.
Use Cases
- Expansion and control joints in interior concrete.
- Cold storage/freezer thresholds.
- Cracks and spalls.
- Utility cuts.
- Cable runs and inductive loops.
- Saw cuts.
Preparation
- Ensure a minimum 28-day concrete cure.
- Use a dry diamond saw to abrade joint walls to a depth of 1.25 inches.
- Remove contaminants, such as curing agents, oils, or wax.
- Clean, vacuum, and wash joint walls thoroughly.
- Perform an acetone wash for improved bonding.
- Use backer rods only in construction joints.
Priming & Moisture Vapor Reduction
- Areas with high moisture vapor should be pre-treated with ASTC CMW.
- Use the 8000 CMW primer to reduce vapor pressure.
Application
- Use ASTC-recommended 1:1 pump equipment.
- Warm the product to 80°F–90°F before use in cold environments.
- Trim over-pour with a razor cutter 15–20 minutes after application.
Static Mixer & Tip
- Use ASTC-provided or recommended static mixers for optimal results.
- Use a copper tip to fill joints from the bottom up, reducing air entrapment.
- Change static mixers every 20 gallons to prevent product build-up.
Limitations
- Do not use on wet surfaces or expose Part A to moisture.
- Store in a cool environment, protected from direct sunlight and extreme cold.
- Professional use only; refer to MSDS before application.
Additional Notes
- Set time varies with temperature and humidity.
- High environmental temperatures shorten pot life and increase set speed.
- For excessively warm products, test a small amount to assess pot life.