EXPERT SOLUTIONS FOR DAMP, TIMBER & BASEMENT WORKS

TRUSTED BY CONTRACTORS & PRESERVATION SPECIALISTS

  • Trade Quality Products

    Trusted by professionals nationwide

  • Same-Day Dispatch Available

    For orders placed before 3PM

  • Specialist Technical Support

    Expert help when you need it

  • Up to 30-Year Guarantees Available

    For BIOKIL. Approved Contractors ONLY

Newton Waterproofing  |  SKU: A18

Newton 801-M Mastic Sealant – 310ml

Regular price £12.40
Pack

Customer Services

Got a query? Call 0330 055 8210

We're open from 8am to 5pm, Monday to Thursday, and 8am to 4:30pm on Friday.

Delivery and Shipping

Delivery is £12.50 + VAT to UK Mainland. Orders over £100.00 + VAT qualify for free delivery, except for certain products—these will be clearly shown at checkout.

Orders placed by 3pm (stock permitting) are dispatched the same working day on a next working day service (not guaranteed).

Some areas, like Northern Scotland, may take 2–3 working days.

Deliveries outside the UK Mainland are charged at cost—please contact us.

We're open:
Mon–Thurs: 8am–5pm
Friday: 8am–4:30pm

Call us: 0330 055 8210

Newton 801-M Mastic Sealant – Sealing mastic for membrane fixing plugs

Newton 801-M Mastic Sealant is a non-toxic, solvent-free, multipurpose single-component silicone sealant, primarily used with Newton System 800 damp proofing membranes. Applied to the fixing plugs before they are fitted, it seals the penetration and stops a "bridge" forming between the damp or stained substrate and the new internal surface. It has high resistance to ageing and temperature extremes and achieves high adhesive strength without primer on most building and engineering materials.

Key features

  • Prevents efflorescent salts and staining to the finished surface
  • Seals the fixing plug to the membrane
  • High adhesive strength without primer
  • Compatible with alkali substrates such as concrete and brick
  • Temperature range -50°C to +150°C
  • High resistance to ageing; non-toxic and solvent free

Typical applications

  • Sealing fixing plugs to System 800 membranes (Newton 803, 803 Newtonite, 805 Newlath)
  • Sealing around service penetrations and protrusions through the substrate/membrane
  • General high performance multipurpose sealing in building

Available options

  • Single tube

Technical information

Property Value
Type Single-component silicone sealant
Colour White
Temperature range -50°C to +150°C
Pack 310 ml cartridge
Shelf life Minimum 12 months sealed, stored +5°C to +25°C

Limitations

  • Do not expose to thermal, mechanical or chemical influences until fully cured
  • Not suitable for structural glazing, mirrors, polyacrylate, polycarbonate or sanitary applications
  • Not suitable where the cured sealant will form part of a painted finish

Health and safety

Read the safety data sheet before use. Always test adhesion and compatibility on a small area before full application.

Download the Newton 801-M Mastic Sealant technical data sheet (PDF)

Download the Newton 801-M Mastic Sealant safety data sheet (PDF)

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Maestro
  • Mastercard
  • PayPal
  • Shop Pay
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.