Newtonite 801 Mastic is a multipurpose silicone sealant specifically designed for use with NewLath 805 Mesh Membrane and Newtonite 803 Membranes. Applied to fixing plugs before installation, it effectively seals penetrations and prevents moisture bridging between damp substrates and new internal surfaces.
With excellent resistance to ageing and extreme temperatures (-50°C to +150°C), this high-performance mastic offers strong adhesion without the need for a primer. Compatible with a wide range of building materials, including concrete, brick, glass, metals, treated wood, and PVC, it ensures a reliable and long-lasting seal.
Key Benefits:
✅ Prevents efflorescence and staining on finished surfaces ✅ Seals fixing plugs to membranes for a watertight finish ✅ High adhesive strength without a primer ✅ Compatible with various building materials, including alkali substrates ✅ Wide temperature tolerance from -50°C to 150°C ✅ Solvent-free, non-toxic, and highly resistant to ageing
Ideal Applications:
✔ Sealing fixing plugs to Newtonite 803, 803 Mesh, and NewLath 805 Mesh Membranes ✔ Sealing service penetrations and protrusions through substrates and membranes ✔ General-purpose, high-performance sealing in the building industry
