Everbuild Everflex Premium 450 + Builders Silicone C3

Everbuild Everflex Premium 450 + is a low modulus, neutral cure RTV silicone sealant that adheres to a wide range of both porous and non porous surfaces without the need for priming. Conforms to ISO11600 F25 LM. Excellent external weathering properties.

Units per pack





C3 Cartridge

Unit Price

£5.79   + VAT


Our price

£5.79 £6.95 inc VAT


£7.24 £8.69 inc VAT

HUGE SAVINGS ON BULK ORDERS Call 0845 177 0666 for a bespoke quote

Everbuild Everflex Premium 450 +

Product Code: EV450-25-C3-CART

Product Description

Everbuild Everflex Premium 450 + Builders Silicone is a premium quality low modulus non-corrosive neutral cure silicone sealant that adheres to virtually all substrates, both porous and non-porous.


  • Excellent adhesion – adheres to most common surfaces including glass, metals, plastics and wood
  • Low dirt pick up – important in PVCu  work
  • Excellent flexibility – +/- 25%.
  • High resistance to plasticiser migration – may be used over water based and solvent based paints.
  • Excellent external weathering properties.
  • Suitable for use on polycarbonate

 Areas For Use

  • Perimeter pointing internally and externally around PVCu /wood and all other window frames.
  • Sealing and as an adhesive onto PVCu, plastic trims and components.
  • Bedding insulated glass units in accordance with relevant clauses of BS8000 Part 7.
  • Suitable as an expansion joint sealant.
  • Weather sealing and joint sealing to pre-formed panels.
  • Sealing soft metals such as lead, copper and zinc.
  • General glazing sealing and draughtproofing, including repair work over existing sealant.
  • Glass to glass and glass to aluminium sealing.
  • Parapet and roof weather sealing applications.


  • Do not use in conjunction with bitumen asphalt, neoprene and certain organic elastomers.
  • Do not use in the manufacture of Aquariums. Use Everbuild Aqua Mate
  • Do not use on substrates that bleed oil, solvents or plasticisers.
  • Non overpaintable. Use Everbuild Weather Mate.
  • Use as a mirror adhesive; Not recommended- Use Mirror Mate.

Surface Preparation

The surfaces to be must be clean, dry and free from dust, grease and other contaminants.

Improve adhesion by wiping surface with Everflex PVC Solvent Cleaner (pvc) Everflex Glass Cleaner (glass) or white spirits (painted surfaces). Priming is generally not required, although we always advise testing small areas prior to use.

Joint design should be as follows:

Minimum width: 6mm. Movement capacity will be impaired if the depth of the joint is greater than the width. For maximum movement accommodation, it is recommended that:

  1. The joint depth should be no less than 5mm
  2. Joint depth should be 5mm for joints up to 10mm wide
  3. Joints above 10mm in width should be half the width in depth up to 20mm and  minimum 10mm for wider joints

For deep joints, reduce depth by using Everflex Fill and Foam or a suitable joint backer rod.

All joints should be designed so that the seal is placed in a position which does not retain water or form a water trap.  Triangular fillets should be no less than 12mm across the face and should be finished with a flat or convex face.


Cut the tip of the cartridge taking care not to damage the thread. Apply nozzle and cut at an angle of 45o with an opening slightly larger than the gap to be sealed. Apply using a standard sealant gun. Best results will be obtained by keeping an even pressure on the trigger and keeping the gun at a constant angle to the surface being sealed.

To ensure a proper bond, always smooth the sealant down with a spatula or piece of wood. An improved joint appearance can be achieved by placing masking tape to both sides of the joint, removing within 5 minutes of application.

Specific Data

Movement accommodation + or -25%
Skinning time: 5 – 25 mins
Cure time 1-2mm per 24 hours
Hardness Shore A 20
Shrinkage 5%
Service temperature resistance -50°C to + 150°C
Application temperature resistance +5°C to + 60°C
Tensile Strength (ISO8339) 0.4Mpa
Specific gravity 1.03
Cleaning Uncured sealant white spirit, cured sealant Everflex Silicone Eater
Minimum joint width 5mm
Maximum joint width    50mm
Joint ratio Maximum depth, 50% of joint width
Coverage 10.5 linear meters as a 6mm diameter bead
Elongation at break             200%
Tensile Modulus at 100% Elongation 0.31Mpa
Tensile Adhesion Modulus @ 100% Elongation 0.3Mpa  (ISO 8339 (glass substrate))
Elastic Recovery >90%




C3 Cartridge

Packs per Box


Solseal Delivery Schedule


Orders placed before midday will be dispatched for delivery the same day (except weekends and bank holidays) subject to stock availability.

Orders placed after midday will be dispatched the next working day (except weekends and bank holidays) subject to stock availability.

When you have placed your order our dispatch team will prepare your items for collection from our couriers. When the couriers have collected your items you will be emailed a tracking number.

Please note: Our offices and warehouses are open Monday to Friday, 8am to 5pm. We are closed on weekends and bank holidays. ‘Working day’ is Monday to Friday.

Please allow 3-5 working days for your delivery unless ‘Next Day Express Delivery’ is stated.

If you have ordered a product that is listed as ‘Next Day Express Delivery’ before midday on Monday to Friday your order will be processed an dispatched the same day delivered the next working day.

For example. If you order a product listed as ‘Next Day Express Delivery’ on Monday before midday it will be delivered the next day (Tuesday).

If you order a product listed as ‘Next Day Express Delivery’ on Friday before midday it will be delivered the next working day (Monday).

If you order a product listed as ‘Next Day Express Delivery’ on Friday after midday it will be processed the next working day (Monday) and delivered the following working day (Tuesday).


Orders for UK Mainland

Any orders placed Monday to Friday before midday will be processed and dispatched the same day.

Any orders placed Monday to Friday after midday will be processed and dispatched on the next working day.

Saturday delivery is available on request only – please call 01708 855 698 for a quote.


Orders for Scottish Highlands and offshore locations

We will always endeavour to deliver to you as quickly as possible and at the best possible price.

However please note postcodes in some areas of the Scottish Highlands and offshore addresses require a delivery surcharge to our normal UK carriage fees and in some cases can take longer to be delivered, so please call us on 01708 855 698 for a bespoke quote and place your order with us over the phone.

AB36-38, AB55-56, FK17-21, G83, GY9, HS1-9, IM (ALL), IV (ALL), JE (ALL), KA27, KA28, KW0-14, KW15-17, PA20-78, PH15-18, PH19-29, PH32-33, PH45-48, PH30-31, PH34-44, PH49-99, PO38, ZE (ALL)