Do You Know These Features Of Hybrid Ms Polymer?

MS polymer sealants, also known as “Modified Silicone” or “Hybrid” sealants, use a modified silane polymer as their base instead of the synthetic polymer base of silicone or the urethane-based polymer system utilized by polyurethane sealants. This unique chemistry allows MS polymers, like our EvoSeal MS, to combine the high-performance characteristics of silicone and polyurethane while minimizing the weaknesses of each. For example, MS polymers possess the durability and paintability of polyurethane without the shrinkage commonly associated with polyurethane chemistries. It also has silicone’s weather and UV resistance while still standing up to abrasion.

SOLVENT FREE

MS polymer sealants contain no solvents, unlike many polyurethanes. Since the main chain does not have highly cohesive segments, solvents aren’t required. The result is a low viscosity, low odor sealant that offers excellent gunnability even at low temperatures.

When sealants containing solvents cure, the solvents will evaporate, and shrinkage occurs. This shrinkage detracts from the seam’s neat and clean appearance and can reduce the seal’s performance. As the product shrinks, it can contribute to cracking and even loss of adhesion. Since MS polymer sealants contain no solvents, they will experience limited to no shrinkage.

Many solvents used in caulks and sealants are Volatile Organic Compounds (VOCs) which can adversely affect the health of building occupants. Sealants with high VOC levels may not comply with green-building initiatives like Green Guard or LEED. MS polymer sealants’ lack of isocyanates and solvents makes them excellent for use in green building projects, hospitals, schools, or any application where limiting VOC exposure is essential.

UV STABILITY

MS polymer sealants are formulated with light stabilizers and antioxidants to limit the impact of ultraviolet light. Since MS polymers are isocyanate-free, the effect of these light stabilizers increases, improving the sealant’s UV resistance. As a result, MS polymer sealants are UV stable. They resist discoloration, cracking, and loss of physical properties like elasticity, making them ideal for exterior applications.

NON-STAINING / STREAKING

Many silicone sealants contain silicone oil. Over time, this silicone oil can bleed into and onto surfaces adjacent to the sealant, staining them. As this oil moves onto other surfaces, dirt and dust particles adhere to it. Once rain or other precipitation occurs, it washes these dust particles away, which leaves behind unsightly streaking.

Since MS polymer sealants do not contain silicone oil, they will not stain surfaces. Having no silicone oil also helps to limit dirt pickup, reducing unattractive streaking. It also enables MS polymer sealants to be painted with water-based paints. Painting with oil-based paints is still possible, but drying time is greatly extended.

FLEXIBLE, DURABLE ADHESION

MS polymers are also very flexible, enabling them to expand and contract with changes in temperature

VERSATILE FORMULATION

MS polymer formulations are easily modified by blending different polymer types, adding plasticizers, fillers, or other additives. These modifications allow MS polymers to be ‘engineered’ to meet the demands of specific applications, further adding to the chemistry’s versatility.