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Würth

Würth Neutral Silicone Perfect

Würth Neutral Silicone Perfect

Key Features

  • MEKO-free, low-emission formulation, awarded the EMICODE EC1 Plus label for health and environmental safety.
  • Certified for window glazing in accordance with DIN 18545, Part 2, Sealant Group E.
  • Meets EN 15651 requirements for facade elements, glazing, and sanitary joints.
  • Excellent adhesion to wood, metals, and many plastics without primer.
  • High abrasion resistance and easy smoothing, producing a neat finish.
  • Permanently elastic, resistant to weathering, UV, and ageing.
  • Surface dries tack-free, with short stringing for cleaner application.
  • Building material class B2 (DIN 4102) - normally inflammable.
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Description

Environmentally Friendly Premium Sealant

Würth Neutral Silicone Perfect is a high-quality, MEKO-free neutral cure silicone sealant designed for demanding construction and glazing applications. With its environmentally safe composition, it is classified as very low emission under the EMICODE EC1 Plus system, making it suitable for use in both residential and commercial projects where indoor air quality and sustainability are critical.

Certified Performance

The product meets strict requirements for glazing and construction sealants:

  • DIN EN 15651 Parts 1/2/3: Sealants for facade elements, glazing, and sanitary joints.
  • DIN 18545-2, Sealant Group E: Glazing requirements.
  • Fire behaviour Class E.
  • Stability under load: < 3mm.
  • Volume loss: <10%.
  • Elastic recovery: >=70%.
  • Tensile Stress: <0.4 MPa.

Reliable Application

Designed for a wide variety of sealing tasks, Silicone Perfect offers excellent adhesion to wood, metals, plastics, glass, and many coated surfaces. It has outstanding compatibility with most paints and glazing coatings, though preliminary testing is always recommended.

Durability and Flexibility

With a continuous motion absorption of 25% and breaking elongation of 450%, the sealant remains permanently elastic under dynamic load. It demonstrates excellent resistance to UV, weathering, and ageing, making it suitable for both indoor and outdoor applications.

Professional Application Properties

The tack-free surface, short stringing, and very good smoothing properties ensure neat and precise joint finishes with minimal clean-up. Its high abrasion resistance makes it particularly well-suited to areas subject to wear.

Important Notes

Not suitable for bonding or cavity filling. Avoid direct contact with laminated glass films, VKP tape, and plasticiser-containing substances (e.g. butyl, bitumen) to prevent discolouration. Risk of yellowing cannot be excluded in shaded areas or in contact with alkyd resin paints. As with all silicones, a typical curing odour will be present during hardening, which disappears once fully cured. Colouration effects may also be influenced by environmental conditions such as vapour, smoke, or emissions from nearby surfaces.

Technical Information

Specifications

Container: Cartridge

Contents: 310 ml

Chemical basis: Neutral crosslinked silicones, oxime-based

Fungicidal properties: Yes

Colour: Concrete grey

Min. skin-formation time: 20 minutes

Ultraviolet resistance: Yes

Continuous motion absorption: 25 %

Density: 1.25 g/cm³

Smell/fragrance: Characteristic

Full curing speed/conditions: 2 mm/day at 23°C and 50% relative humidity

Shelf life from production: 12 months

Min./max. processing temperature: +5 °C to +40 °C

Min./max. temperature resistance: -40 °C to +180 °C

Coating compatibility: Yes

Recoatable/paintable: No

Shore A hardness: 20

Min. breaking elongation: 450 % (for 2-mm film)

Building material class: B2 – Normally inflammable (DIN 4102)

DIN compliance: DIN 18545-2, Sealant Group E

Water-vapour diffusion resistance (µ): 749

Number per pallet: 576 pcs

Sustainability: EMICODE EC1 Plus – very low emissions

Documents

Application Instructions

  1. Ensure surfaces are load-bearing, clean, dry, and free of grease, rust, and water.
  2. Do not apply during heavy rain.
  3. Observe recommended joint dimensions.
  4. Insert PE back-fill material as required.
  5. For porous or absorbent substrates, use a primer.
  6. Apply evenly using a cartridge gun.
  7. Smooth immediately before skin formation (approx. 20 minutes) using a smoothing tool and a suitable smoothing agent. Remove any excess product next to the joint at once to avoid staining.

Safety and Usage Notes

  • Always carry out preliminary tests, especially on coated or painted surfaces.
  • Store in a cool, dry, frost-free environment.
  • Discolouration risks exist when exposed to certain coatings, vapours, or plasticiser-containing materials.