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Neutral, one-component, alkoxy crosslinking silicone sealant with a low modulus of elasticity.

Features and benefits:

  • Highly durable.
  • Suitable for use on natural stones and marble.
  • Provides protection against the growth of algae and mould species.
  • Solvent-free.
  • High adhesion onto both absorbent and non-absorbent substrates.
  • Odourless.
  • Water-hardening.
  • Non-corrosive.
  • CE marked, and manufactured in accordance with EN 15651-1, EN 15651-2, EN 15651-3 and EN 15651-4.
  • Classified as F-25-LM and G-25-LM according to EN ISO 11600.


Suitable for interior and exterior use on walls and floors. Can be used on the elastic joints between:

  • Glass or glazed surfaces.
  • Metals.
  • Ceramics.
  • Cement.
  • Rigid plastics.
  • Wood.

Used to create perimeter, control and expansion joints on the following:

  • Terraces.
  • Balconies.
  • Flat roofs.
  • Exterior paving.
  • Connecting joints between precast elements.
  • Facades.
  • Sanitary environments.
  • Pedestrian walkways.

Must be used in its original state, without the addition of other materials.

Consult manufacturer's literature for details on recommended substrate preparation, mixing instructions and consumption on different sized joints.

Related literature

The following content references this product:

Standard product features

Technical characteristics:

  • Form: Thixotropic paste.
  • Specific weight: 1 (±0.02) kg/L.
  • Working time (at 23°C and 50% RH): 20 minutes (approximately).
  • Reticulation speed (at 23°C and 50% RH): 2 mm per 24 hours.
  • Shore D hardness (to ASTM D 868): 20–30.
  • Modulus of elasticity at 100% elongation (to ISO 8339): ≥0.61 MPa.
  • Tensile strength (to ISO 8339): ≥0.7 MPa.
  • Elongation at break (to ISO 8339): ≥300%.
  • Application temperature: 5–40°C.
  • Temperature resistance: -40°C to 150°C.
  • Conformity: To EN 15651-1: F EXT-INT-CC; to EN 15651-2: G-CC; to EN 15651-3: XS1; to EN 15651-4: PW EXT-INT-CC.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-75/345 Silicone construction joint sealants
45-55-75/360 Silicone glazing compounds or sealants
45-55-75/315 Construction joint sealants
45-55-75/365 Weatherseal sealants for structural sealant/ bonded glazing

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Fassa UK Ltd


+44 (0)1684 212272

Product reference

Fassasil NTR Plus


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Manufacturer details

Fassa House,
Ashchurch Business Centre,
Alexandra Way,
Tewkesbury , GL20 8TD
Tel +44 (0)1684 212272
NBS Plus