DynaFlex SC

After a brutal winter many public buildings and facilities need repairs to fix all the broken joints and sharp edges. Avoid possible lawsuits, vandalism, and further damage by immediately fixing the problem areas with DynaFlex SC. DynaFlex SC is a unique one part, non-sag, tamper resistant elastomeric STPU (silyl-terminated polyurethane) joint sealant. DynaFlex SC may be more expensive than typical sealants, but these other sealants are far less rugged and durable. When using DynaFlex SC you’ll be repairing less and protected from tampering and/or acts of vandalism.

DynaFlex SC

DynaFlex SC Attributes:

  • One part, non-sag, tamper resistant elastomeric STPU joint sealant
  • Many of the strengths of a two-component security sealant
  • User friendly, ease of application properties of an one-component sealant
  • Achieves high tensile and tear strengths
  • Abrasion resistance and an average ultimate hardness of at least 55
  • Can withstand 25% total joint movement

Dynaflex SC is a tamper-resistant security sealant. It can be used for interior expansion and control joints, window and door perimeter joints, protrusions and penetrations, vents, around fixtures, and in other interior joints or openings of any kind requiring a sealant. Dynaflex SC can be used on masonry to masonry, masonry to metal, or metal to metal. It also has great adhesion to polycarbonate sheet for interior security glazing.

DynaFlex SC Physical Properties


Surface Preparation:

Proper joint preparation is extremely critical when using DynaFlex SC. All surfaces must be clean, dry, and free from all foreign matter and contaminants. This includes curing compounds, form-release agents, and other coatings. Old caulking materials should be completely removed with tool and/or other abrasives. When working with metal, all surfaces must be free of rust, corrosion, and protective coatings.


Security caulking requires exceptional adhesion, particularly in containment areas like inmate cells and similar structures. P-75 primer should be used on porous substrates to obtain a superior adhesion. When working with steel, aluminum, polycarbonate, and glass P-120 primer should be used. When applying DynaFlex SC over block that has been sealed with a block filler, priming may still be necessary.


Before application, joints should be masked to ensure a clean appearance. DynaFlex SC should be applied in a continuous fashion using standard caulking equipment. Be sure to fill the joint completely. If tooling is necessary, be sure to do it immediately to assure a full adhesion.


It is important to immediately remove all excess sealants and smears with mineral spirits. If DynaFlex SC has already cured, remove it by scraping with a tool or an abrasive. If painting is necessary to match color, the best choice would be a high quality latex paint. A good oil based paint will also be acceptable.


If the sealant is damaged and the bond is still intact, cut out the damaged area, prime, and recaulk. If the bond has been compromised, completely remove the sealant, clean / prepare the joint, prime, and recaulk.