Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Advantages
- Excellent elastomeric and recovery properties.
- Prolonged life due to high weathering resistance.
- Resists bio-degradation in sewage treatment.
- Wide range of operating temperatures.
- Choice of primers gives outstanding adhesion even to damp concrete.
- Can be accelerated to allow use in tidal conditions.
Applications & Uses
- Applications
- Application Area
- Uses
For sealing movement joints in building and civil engineering construction above or below ground. For subways, retaining walls, sea walls and sewage treatment plants. Suitable for areas subject to fuel and chemical spillage.
- Application Instructions
Joint Preparation - The substrate to which Nitoseal PU220 is bonded must be clean, dry and sound. Arris repairs should be effected using a Fosroc repair compound.
Remove all dirt, surface laitence, residual joint former or other contamination from joint faces by power wire brushing, grinding or grit-blasting. Blow all joints clean using dry, oil-free compressed air.
Any expansion joint filler must be checked to ensure it is tightly packed and no gaps or voids exist at the base of the sealing slot before positioning a bond breaker.
Note: The use of a bond breaker is not required in expansion joints containing Hydrocell XL or Expandafoam cellular polyethylene expansion joint fillers. For construction or contraction joints a bond breaker e.g. Expancell cord or debonding tape should be used. Where hydrostatic pressure exists, only bond breaking tapes must be used, not foamed back-up strips. Where a particularly neat finish is required, mask the face edges of the joint before priming and remove immediately after tooling is completed.
Priming
- Nitoprime 25 - The two components of Nitoprime 25* are supplied in the correct mixing proportions. Mix thoroughly together (pot life 1 hour @ 20°C or 40 minutes @ 35°C) and brush onto the substrate and leave to dry for at least 90 minutes (20°C) or 40 minutes (35°C) before applying Nitoseal PU220. If joints are not sealed within 4 hours (20°C) or 2 hours (35°C), they must be reprimed before sealing.
Mixing - The two components of Nitoseal PU220 are supplied in the correct mixing proportions. The entire contents of the base and hardener containers must be thoroughly mixed together for at least 2 minutes using a recommended Mixing Paddle fitted to a slow speed electric drill (400-500 rpm). the inside of the tin should then be scraped with a flat bladed tool to ensure that unmixed components do not remain around the sides. Mixing should then be continued for a further 3 minutes. Total mixing time is 5 minutes.
Application - After thorough mixing of the two components, place the single hole follower plate over the Nitoseal and fill directly into a Fosroc Barrel Gun. Gun Nitoseal PU220 firmly into the joint to ensure complete wetting of the bonding surfaces. Compress and smooth the sealant with a joint shaping tool wetted with water and immediately strip off any masking tape.
Cleaning - Uncured Nitoseal PU220 can be cleaned off with Fosroc Solvent 102*. Cured Nitoseal PU220 can only be removed mechanically.
- Estimating
Supply
Nitoseal PU220 4 liter packs (base and hardener) Nitoprime 25 1 and 4 liter packs Nitoseal Accelerator 100 g units Fosroc Solvent 102 5 liter cans Guide to Sealant Quantities
Number of liters required = (Joint Width(mm) x Sealant Depth(mm) x Joint Length(m)) / 1000
A further amount should be allowed for wastage.
- Limitations
- Application should not commence if the temperature of the substrate is below 5°C.
- The service temperature range of Nitoseal PU220 is -30°C to +80°C.
- Coverage
Typical coverage, depending upon substrate porosity and joint profile, is 100 meters of 10 mm joint depth per liter.
Properties
- Typical Properties
- Chemical Resistance
Good resistance to most common mineral acids, alkalis, petroleum based fuels and oils. For specific chemical resistance data, please contact our Technical department.
| Value | Units | Test Method / Conditions | |
| Flash Point (Nitoprime 25) | 39.0 | °C | - |
| Flash Point (Solvent 102) | 33.0 | °C | - |
| Hardness (7 days, 25°C) | 15 - 25 | Shore A | - |
| Movement Accommodation Factor | 25.0 | % | - |
| Tack-free Time (10°C) | 72.0 | hours | - |
| Tack-free Time (20°C) | 24 - 48 | hours | - |
| Tack-free Time (35°C) | 16 - 24 | hours | - |
| Tack-free Time (With accelerator, 8 ml per 4 litre pack, 10°C) | 1.0 | hour | - |
| Tack-free Time (With accelerator, 8 ml per 4 litre pack, 35°C) | Not Required | hours | - |
| Tack-free Time (With accelerator, 8 ml per 4 litre pack, 20°C) | 24.0 | hours | - |
Regulatory & Compliance
- Certifications & Compliance
- Standard Compliance
Nitoseal PU220 meets the performance requirements of US Federal Specification TT-S-00227E, Type 2 Class A and ISO 9047 MAF 25%.
Technical Details & Test Data
- Design Criteria
Joints should be designed so that total movement due to concrete shrinkage and thermal changes does not exceed the 25% movement accommodation factor related to the joint width.
Joint Width (mm) Sealant Depth (mm) 6 - 12 mm Equal to width 12 - 25 mm 12 - 20 mm 25 - 50 mm 20 - 30 mm The depth of the joint must never exceed the width. The minimum size of joint shall be five times the anticipated movement.
If the joint design has to be specified for particular conditions (e.g. hydrostatic pressure), consult Fosroc Technical department.
Nitoseal PU220 can be applied vertically up to a joint width of 25mm without slumping. For joints greater than 25mm wide, multiple applications may be necessary.
Safety & Health
- Precautions
Health and Safety - Nitoseal PU220, Nitoprime 25, Nitoseal Accelerator and Fosroc Solvent 102 should not come in contact with skin and eyes or be swallowed. Avoid inhalation of vapors and ensure adequate ventilation. Some people are sensitive to resins, hardeners and solvents. Wear suitable protective clothing, gloves and eye/face protection. Barrier creams such as Kerodex Antisolvent or Rozalex Antipaint provide additional skin protection. Should accidental skin contact occur, remove immediately with a resin removing cream such as Kerocleanse Standard Grade Skin Cleanser or Rozaklens Industrial Skin Cleanser, followed by washing with soap and water. Do not use solvent. In case of contact with eyes, rinse immediately with plenty of clean water and seek medical advice. If swallowed, seek medical attention immediately - do not induce vomiting.
Fire - Nitoprime 25 and Fosroc Solvent 102 contain flammable solvents. Do not use near open flames or smoke during use.
Storage & Handling
- Pot Life (10°C)
- 2 - 3
- Pot Life (20°C)
- 1 - 2
- Pot Life (35°C)
- 30 - 60
- Pot Life (With accelerator, 8 ml per 4 litre pack, 10°C)
- 1 - 2
- Pot Life (With accelerator, 8 ml per 4 litre pack, 20°C)
- 48.0
- Pot Life (With accelerator, 8 ml per 4 litre pack, 35°C)
- Not Required
- Storage
Shelf life - 12 months if stored in the original unopened containers in a cool dry place.