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Dow Corning 758 Specifications / MSDS

Dow Corning® 758 Silicone Weather Barrier Sealant - unparalleled, unprimed adhesion to window flashing and fenestration materials.

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Dow Corning® 758  
Silicone Weather Barrier Sealant


Dow Corning® 758 Silicone Weather Barrier Sealant brings long-term durability and ease-of-use for sealing challenging weather barrier substrates. Its consistent adhesion performance and compatibility outperform traditional sealants. And with ±25% movement capability, architects benefit from increased design flexibility.


Low-VOC Dow Corning 758 Silicone Weather Barrier Sealant offers strong adhesion to the most challenging materials, including:

  • Peel-and-stick window flashing and wraps
  • Nonwoven spunbonded window flashing and wraps
  • Polyethylene wraps
  • Polyethylene surfaces
  • Polypropylene surfaces
  • Common polyolefins
  • PVC
  • Steel, aluminum and metals
  • Fluorinated surfaces

Product Properties

Property Unit Value
Flow, Sag or Slump Inch 0.06
VOC Content g/L 55 
Durometer Hardness, A Scale 45
Tensile, Maximum psi 200
Elongation % 800
Movement, Ext./Comp. % +/-25
Staining None
QUV, 5,000 hr Pass +
Shelf Life months 12

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