A one-component high-performance gun-grade moisture-curing polyurethane sealant designed for a wide range of sealing and caulking applications in active exterior joints. NP 1requires no mixing and typically bonds to many materials without a primer, including concrete and masonry.
- Expansion wall joints
- Curtain wall construction
- Panel walls
- Precast units
- Aluminium and wood window frames
- Structural components
- Vinyl siding
- Interior and exterior
- Joint movement capability + 25%.
- Available in cartridges, 591ml ProPaks.
- Easy to gun and tool.
- Range of colours.
- Bonds to most construction materials without a primer.
- One component.
- Weather resistant.
- Wide temperature application range.
- Compatible with non-rigid paints.
- Reduces job-site waste, lowers disposal costs.
- Speeds application and makes neater joints.
- Matches common substrates.
- Lowers installation costs.
- No mixing, less labour.
- Long-lasting weathertight seals.
- Suitable for all climates.
NP 1 is available in 591 ml ProPak sausage cartridges, 20 sausages to a carton.
A complete line of standard colours is available on request, including white, off-white, limestone, stone, tan, aluminium grey, medium bronze, special bronze, redwood tan, and black. Refer to BASF for availability. For colour availability in bulk packaging, call Customer Service.
- Federal Specification TT-S-00230C, Type II, Class A.
- ASTM C 920, Type S, grade NS, Class 25, Use NT, M, A, G and O.
- Corps of Engineers CRD-C-541, Type II, Class A.
- Canadian Specification CAN/CGSB-19.13-M82, Classification MCG-2-25-A-N, CGSB Qualification No. 81026.
- USDA approved for use in meat and poultry areas.
- Underwriters Laboratories Inc. classified (fire resistance only).
- Canadian approval for use in establishments that handle food.
- SWRI validated.
- ISO 11600-F-25LM.
|Service temperature range
||-40°C to 82°C |
||Upto 20 years |
|Movement capability, % ASTM C719
|Tensile strength, psi ASTM D412
|Ultimate elongation at break, % ASTM D412
|Rheological (sag in vertical displacement) at 49°C ASTM C639
||No sag |
|Extrudability, 3 seconds, ASTM C603
|Hardness at std. conditions ASTM C661
|Weight loss, after heat ageing, % ASTM C792
|Cracking and chalking after heat ageing ASTM C792
|Tack-free time, hrs., maximum (72 hrs.) ASTM C679
|Stain and colour change (no visible stain) ASTM C510
|Hardness, after heat ageing, max. Shore A:50 ASTM C661
|Bond durability on glass, aluminium, and concrete + 25% movement, ASTM C719
|Adhesion* in peel, pli, min, 5 pli. ASTM C 794
|Adhesion* in peel after UV radiation through glass, min 5 pli. ASTM C794
Xenon arc 3000 hours Atlas 6500
|No elastomeric property change |
|Tear strength, pit, ASTM D 1004
*Primed for water immersion as indicated in ASTM C 920. Concrete and aluminium primed with 733; glass primed with 766.
For best performance
- Protect unopened containers from heat and direct sunshine.
- In cool or cold weather, store container at room temperature for at least 24 hours before using.
- NP 1 should not be used for continuous immersion in water. Call BASF Middle East Technical Services for recommendations.
- Do not apply over freshly treated wood; treated wood must have weathered for at least 6 months.
- Substrates such as copper, stainless, and galvanised typically require the use of primer, PRIMERS 733. An adhesion test is recommended for any other questionable substrate.
- U.V. exposure may cause white NP 1 to discolour; where maintaining a true white appearance is critical use ULTRA SEALANT.
- NP 1 can be applied below freezing temperatures only if substrates are completely dry, free of moisture, and clean.
- Lower temperatures will extend curing times.
- NP 1 should not come in contact with oil-base caulking, silicone sealants, polysulphides, fillers impregnated with oil, asphalt, or tar.
- NP 1 can be painted over provided it is fully cured. When painting over any elastomeric sealant, use a paint that is also elastomeric (if movement occurs, the paint will also move). An alternative to painting is applying NP 1 in one of its standard colours.
Directions for use
The number of joints and the joint width should be designed for a maximum of + 25% movement.
The depth of the sealant should be ½ the width of joint. The maximum depth is 13mm and the minimum is 6mm.
In deep joints, the sealant depth must be controlled by Closed Cell Backer-Rod or Soft Backer Rod. Where the joint depth does not permit the use of Backer-Rod, a bondbreaker (polyethylene strip) must be used to prevent three-point bonding.
To maintain the recommended sealant depth, install Backer-Rod by compressing and rolling it into the joint channel without stretching it lengthwise. Backer-Rod should be about 3mm larger in diameter than the width of the joint to allow for compression. Soft Backer-Rod should be approximately 25% larger in diameter than the joint width. Backer-Rod becomes an integral part of the joint. The sealant does not adhere to it, and no separate bondbreaker is required. Do not prime or puncture the backer-rod.
Surfaces must be structurally sound, dry, clean, free of dirt, moisture, loose particles, oil, grease, asphalt, tar, paint, wax, rust, waterproofings, curing and parting compounds, and membrane materials.
Concrete, stone, and other masonry
Clean by grinding, sandblasting, or wire brushing to expose a sound surface free of contamination and laitance.
New and weathered wood must be clean and sound. Scrape away paint to bare wood. Any coating that cannot be removed must be tested to verify adhesion of sealant or determine an appropriate primer.
Remove scale, rust, and coatings from metal to expose a bright white surface. Remove protective coatings as well as any chemical residue or film. Aluminium window frames are frequently coated with a clear lacquer that must be removed before the application of NP 1. Any coating that cannot be removed must be tested to verify adhesion of sealant or determine an appropriate primer. Remove any other protective coatings or finishes that could interfere with adhesion.
NP 1 is generally considered a non-priming sealant, but special circumstances or substrates (e.g., certain protective coatings on aluminum) may require a primer. It is the user's responsibility to check the adhesion of the cured sealant on typical test joints at the project site before and during application. Consult BASF Middle East Technical Services for additional information.
Apply primer full strength with a brush or clean cloth. A light, uniform coating is sufficient for most surfaces. Porous surfaces require more primer; however, do not over apply.
Allow primer to dry before applying NP 1. Depending on temperature and humidity, primer will be tack free in 15 to 20 minutes. Priming and sealing must be done on the same work day.
NP 1 comes ready to use. Apply by professional caulking gun. Do not open cartridges or sausages until preparatory work has been completed.
Fill joints from the deepest point to the surface by holding a properly sized nozzle against the back of the joint.
Dry tooling is recommended. DO NOT use soapy water when tooling results in the correct bead shape, a neat joint, and maximum adhesion.
Immediately after use, clean equipment with Xylene or Solvent No. 2. Use proper precautions when handling solvents.
Remove cured sealant by cutting with a sharpedged tool.
Remove thin films by abrading.
The cure of NP 1 varies with temperature and humidity. The following times assume 24°C, 50% relative humidity, and a joint 13mm by 6mm depth.
- Skins overnight or within 24 hours
- Functional within 3 days
- Full cure in approximately 1 week
Shelf life is 1 year for cartridges and Propaks and 4 months for pails when stored in unopened containers under normal conditions. Storing at elevated temperatures will reduce shelf life.
Metres per litre
joint width (mm)
|Joint depth (mm)
NP 1 (all colours) contain mineral spirits, aluminium sulphate, calcium oxide, talc, titanium dioxide, calcium carbonate, silicon dioxide.
May cause skin, eye or respiratory irritation May cause dermatitis and allergic responses. Potential skin and/or respiratory sensitizer. Ingestion may cause irritation. Reports associate repeated or prolonged occupational overexposure to solvents with permanent brain, nervous system, liver and kidney damage. INTENTIONAL MISUSE BY DELIBERATELY INHALING THE CONTENTS MAY BE HARMFUL OR FATAL.
KEEP OUT OF THE REACH OF CHILDREN. Use only with adequate ventilation Prevent contact with skin, eyes, and clothing. Wash thoroughly after handling. Use impervious gloves, eye protection and if the TLV is exceeded or used in a poorly ventilated area, use NlOSH/ MSHA approved respiratory protection in accordance with applicable federal, state, and local regulations.
In case of eye contact, flush thoroughly with water at least 15 minutes. SEEK IMMEDIATE MEDICAL ATTENTION. In case of skin contact, wash affected areas with soap and water. If irritation persists, seek medical attention. Remove and wash contaminated clothing If inhalation effects occur, remove to fresh air. If discomfort persists or any breathing difficulty occurs, or if swallowed, SEEK IMMEDIATE MEDICAL ATTENTION.
Refer to Material Safety Data Sheet (MSDS) for further information.
NP 1 contains 81.6 g/L less water and exempt solvents.