Siderise RFT120 Aluminium Jointing Tape (120mm x 45m)

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£39.86 £33.22
In stock

The technical performance of Siderise RFT120 demonstrates the high level of fire resistance and thermal performance of the Siderise RFT120, as well as its durability and ability to withstand compression. The various certifications and ratings also attest to the quality and reliability of this insulation material.

  • Material: high-density mineral wool

  • Fire resistance rating: 120 minutes

  • Thermal conductivity: 0.037 W/mK

  • Density: 150 kg/m³

  • Water absorption: ≤ 1% by volume

  • Compressive strength: ≥ 40 kPa

  • Dimensions: 1200mm x 600mm x 50mm (custom sizes available)

  • Standards and certifications: EN 1366-3, EN 13501-1, FM Approval, LANTAC Certification, BRE Green Guide A+ rating

Siderise RFT120 Aluminium Jointing Tape

Form: Aluminium foil tape - Silver

Width: 120mm

Length: 45m rolls

Thickness: 30m foil

The Siderise RFT120 Jointing Tape is a specialized aluminum foil tape that offers superior adhesive strength, longevity, and ultraviolet resistance. It is specifically designed to seal joints between neighboring units of Siderise cavity barriers and fire stop systems while also providing added protection against the spread of smoke.

A dead soft 30-micron aluminium foil tape coated with a long-lasting, ultraviolet resistant acrylic adhesive on one side, and lined with a release paper to protect the adhesive face.

Siderise RFT120 has been used in multiple fire resistance tests including EN 1364-4, EN 1366-4, BS 8414, NFPA 285 and BS 476-20. Depending on the Siderise cavity barrier or fire stop system, RFT120 can be used to help maintain up to 300 minutes integrity at joints.

Technical Specification

Property Value
Form Aluminium foil tape - silver
Width 120mm
Length 45m Rolls
Thickness 30µm foil, 120µm total thickness including release paper
Shear 200 hours
Tensile strength Without release liner: 45N / 25mm
Peel adhesion 5%
Elongation 20 mins: 14.5 N / 25mm; 60 mins: 14.3 N/ 25mm; 24 hours: 19.4 N/25mm
Looptack 12.0 N
Humidity shear test 4 hours
Application temperature range -20ºC to +50ºC. Surface must be free from ice or moisture
Service temperature range -40ºC to + 120ºC. Can withstand 140ºC for a few minutes
Moisture vapour permeability Less than 1g/m2/24 hrs @ 38° & 90% RH


Siderise RFT120 Aluminium Jointing Tape | Available at Dortech Direct


More Information
Brand Siderise


Best Seller Yes
Size 16"
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Delivery & Returns


If you wish to initiate a product return within 14 days, we gladly offer a refund as long as the item is returned in its original condition, including all packaging, tags, labels, and accessories. Kindly complete the provided return form and include it in the package you are sending back.

Please be aware that orders exceeding £100 excluding VAT are subject to a non-negotiable 40% restocking fee.

Ensure that you diligently fill out all the necessary fields on the Returns Form. It is particularly crucial to provide your customer details and order number to facilitate a prompt processing of your return; failure to include this information may result in delays in refund processing.

Delivery & Returns

Delivery Information - What does your delivery option mean?

All deliveries are subject to stock and availability.

UK Mainland

**Next Day Cut Off – subject to cleared payments and passing of payment security checks by 12pm.

Orders processed after 12pm using the next-day service option cannot be guaranteed.

All UK Mainland orders qualify for FREE when you spend £50 ex vat or more*. *Please note certain items do not qualify for free delivery. 

Consignments will be delivered using DPD, Evri, and Shipley, or direct from the supplier if stock is not readily available within our warehouse.

Please note that orders placed on a Friday after 12pm for next day delivery will be dispatched on the following Monday for delivery on Tuesday.

Orders placed prior to a Bank Holiday will be delivered two days after the Bank Holiday.

Delivery Options - B2C

Price (ex vat)


FREE Standard Delivery when you spend £50 ex vat or more


Monday - Friday, excluding public holidays. 

Standard Delivery (2-5 working days)


Monday - Friday, excluding public holidays. 

Express Delivery  (1-3  Working Days)


Monday - Friday, excluding public holidays. 













Unfortunately, We Cannot Guarantee Next Working Day - you will be notified if we can't fulfill this. 

Certain items do not qualify for free delivery - this will be automatically applied at the checkout

Large heavy items may be subject to pallet charges - you will be notified by our customer care team. 

Outside UK Mainland (Including Ireland)

*Please note the following postcodes are classed as Non-Mainland UK or Remote / Rural delivery: AB, IV, KW, PA, PH, HS, KA, ZE, PO30-PO41, IM, JE, GY, BT, TR21-TR25.

Regardless of the order weight and quantity, the following locations incur a carriage charge of £24.99 INC VAT


Delivery Options - B2B



FREE Delivery on any B2B order


Monday - Friday, excluding public holidays. 




Next working day delivery cut off is 1pm.

We will always try and accommodate next day delivery where we can but to guarantee next day delivery, any PO must be with Dortech before 1pm.  

If you require a next day delivery but order after 1pm, a premium delivery option can be organsied through the trade sales team.   

However, there is no guarantee this order will arrive the next working day. Does not apply to pallet orders.  

We will deliver into branch or direct to any customer office/site address.



It is advised you arrange your own courier collection from our warehouse. If you require assistance Dortech Direct can schedule a delivery for you. Prices are dependent on box quantity and order weight. Please call our sales team for a quotation on 0330 1281212.

Please Note

  • All available delivery options will be displayed at checkout/basket pages
  • Working days do not include Weekends or Bank holidays
  • For all enquiries ring 0330 1281212 / [email protected]

BACS & Purchase Orders

  • The delivery times & dates are only valid from receipt of funds or valid PO number


By ordering with Dortech Direct you agree to inspect goods upon delivery. Damaged goods should be rejected. If you notice damage after the goods are delivered, you must report this to us within 48 hours of delivery. Dortech Direct does not accept damage liability for issues reported over 2 working days from the point of delivery.

You can report damage by sending your order details and images of any issues to [email protected]


If you need to return a product within 14 days, we are happy to refund the product provided it is returned, as sold, with all the original packaging, tags, labels and accessories.

Prior to returning any goods for any reason, please fill in the Returns Form and put it in the package that you are returning. Please note some orders are subject to up to a 35% restocking fee.  This charge represents the administrative time and overheads to reprocess the stock.