Konstrukt™ K-630 Join "N" Seal Hybrid Polyurethane Sealant

Konstrukt™ Join "N" Seal Hybrid Polyurethane Sealant is a high quality, professional and universal low modulus sealant based on hybrid technology that cures under the influence of humidity to form a durable elastic rubber.
It is specially developed for the sealing of construction and expansion joints and joints in pedestrian walkways on most common building materials such as concrete, brick, painted wood, metal, and a variety of plastics.
Once properly cured, the product can be painted over using suitable water-based elastomeric paint.

Technical Data

(±0.05 kg/L)

1.35 g/cm3


600 mL sausage

100% Modulus

0.35 MPa

Application Temperature

5 to 40°C

Curing Time

2.5 mm/ zi
*Measured at 23°C and 50% relative humidity

Elongation at Break

*DIN 53504

Joint Movement


Shore-A hardness

25 Shore A
*DIN 53505

Skin Formation

90 minutes
*Measured at 23°C and 50% relative humidity

Shelf Life

If unopened and stored between 5°C and 25°C, shelf life is 1 year after production date. Always store product in a cool, dry place.

Temperature Resistance

30 to 70°C

Tensile Strength

0.5 MPa


For interior and exterior use
Free of isocyanates, solvents, and silicones
Adheres to the substrate well without the use of primer on most surfaces
Low modulus
Cures neutrally
Low in odor
Does not shrink over time and is bubble free
Good UV, weather, and water resistance
Durable, permanent, and elastic
High mechanical resistance strength


The key to long-term sealant and adhesive performance is proper substrate preparation. The substrate must be clean, dry, and free of any oils, greases, incompatible sealers, paints or coatings that may interfere with adhesion and good joint performance. Porous surfaces should be cleaned of dust and debris from fabrication or job site dirt before cleaning using a stiff brush or using oil and moisture free compressed air. Mechanical methods, such as wire brushes or grinders, may be required to remove surface contamination, debris, and failed sealants such as in re-caulking applications.


A well-designed joint should have a sufficient width so it would be able to take and process the movement of the adjacent building elements. A general rule is the ratio of joint depth to joint width (with a maximum size of 10mm) should be 1:1, with a minimum of 5mm in width and depth. For joints wider than 10mm, the ratio is 1:2 with a minimum depth of at least 10mm and a maximum of 15mm.


Apply Konstrukt™ Join "N" Seal Hybrid Polyurethane Sealant using a professional caulking gun.


Excess sealants should be cleaned off the substrate while it is still uncured using commercial cleaners.


* For technical reasons connected with color reproduction in print and paint manufacturing,
these colors may not exactly match actual paint color.
For MSDS requests, please email technical@boysen.com.ph