SikaHyflex-150 LM

One part, low modulus, hybrid sealant

SikaHyflex-150 LM is a premium-grade, high movement, fast curing, one component, non-sag, elastomeric,hybrid sealant. Meets ASTM C-920, Type S, Grade NS, Class 50, use NT, M, A, G, O

Where to use

  • For joints or gaps connecting dissimilar substrates – e.g. vinyl to concrete, aluminum to EIFS
  • Window Perimeter
  • Expansion joints
  • Curtain Wall construction
  • For applications that require both paintability and adhesion to non-porous substrates
  • When easy cold weather application is desired


  • Fast skin time
  • Multi-substrate adhesion
  • Superior UV resistance and weathering
  • Color retention – white stays white
  • Can be over-painted soon after application (once skin has formed)
  • Very low VOC < 12g/L
  • Non-Staining



The number of joints and the joint width should be designed for a maximum of ±25% movement of joint width at time of installation. The depth of the sealant should be 1/2 the width of the joint. The maximum depth is 1/2 inch (13mm) and the minimum is 1/4 inch (6mm). To control joint depth, use closed cell polyethylene, non-gassing polyolefin or open cell polyurethane backer rod. If joint depth does not allow for backer rod, use polyethylene bond breaker tape to prevent three-sided adhesion. Closed cell backer rod should be 25% larger than joint width; do not compress more than 40%. Open cell should be compressed 40%. Do not use open cell rod in horizontal on grade joints or with E.I.F.S. Ready to use, apply using professional caulking gun. Do not open product container until preparation work has been completed. Apply sealant using consistent, positive pressure to force sealant into the joint. Tool sealant to create a concave joint shape and achieve maximum adhesion. Dry tooling is recommended. DO NOT use soapy water or other liquids when tooling.


10.1 fl. oz. cartridge seals 12.2 linear ft. of 1/2 x 1/4 in. joint.

20 fl. oz. uni-pac sausage seals 24 linear ft. of 1/2 x 1/4 in. joint.