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3M Scotch-Weld Surface Insensitive Instant Adhesive SI Gel

3M Scotch-Weld Surface Insensitive Instant Adhesive SI Gel

High-viscosity cyanoacrylate gel bonding porous and contaminated substrates with maximum gap filling and fast curing strength.

680211

Low stock

⚙ Ideal For

  • Porous material bonding (wood, cork)
  • Leather and fabric assembly
  • Rough and contaminated surfaces
  • Gap-filling joint applications
  • Quick project completion work

✔ Benefits

  • Surface insensitive formulation
  • Gel viscosity for gap filling
  • Works on porous and acidic surfaces
  • 2900 psi shear strength
  • 6–23 second work time
DETAILED DESCRIPTION →
£20.99 GBP
£20.99 GBP
£17.49 Ex. VAT
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🚚 UK Shipping: Standard (£2.99) or FREE on orders over £75.

📦 Dispatched same-day if ordered before 3pm!

Shipping Information

What Are My Shipping Options?

In-Store Pickup

In-Store pickup is available on all purchase. Pickups are available Monday - Friday between the hours of 9:00–17:00. 

An email confirmation will be sent when your order is ready for collection. 

Free Shipping

We offer free Standard (2-3 Days) shipping on orders within the United Kingdom on orders over £100. Please note, some large items that require specialist courier companies, such as large mirrors and palleted items are excluded from this deal.

Shipping Fees

We also offer shipping at the following rates:

Standard-Size Parcel

Standard (UK Only) - 2-3 Days - £2.99

Express (UK Only) - 1-2 Days - £4.99

International (EU) - 3-7 Days - £14.99

International (ROW) - 5-10+ Days -£23.99


Large Parcel

Standard (UK Only) - 2-3 Days - £2.99

Express (UK Only) - 1-2 Days - £4.99

International (EU) - 3-7 Days - £14.99

International (ROW) - 5-10+ Days - £69.99

Most UK orders will be sent using Royal Mail, with larger items being sent with DPD.

International orders within the EU will normally be dispatched with Royal Mail, DPD, or UPS.

International orders to the rest of the world will normally be sent with DPD or UPS.

Please note, international delivery charges are very volatile and subject to change. We will do everything in our power to honour the delivery fee, however, in some cases, shipping may increase in price. In this event, you will be given the offer to pay the difference or cancel the order and receive a full refund.

Please note, we may be subject to various rules and restrictions in relation to some international deliveries, and you may be subject to additional taxes and duties over which we have no control. If such cases apply, you are responsible for complying with the laws applicable to the country where you live and will be responsible for any such additional costs or taxes.

Dispatch Times

Orders placed before 15:00 Monday - Friday will be shipped on the same day. 

Orders placed after this time will be shipped on the following business day,

Please note, we are closed at weekends, as well as English Bank Holidays.

Returns Policy

Our refund policy can be found at the following address: https://esupplyline.com/policies/refund-policy.

Further Information

You can contact us for further information on our shipping policies using the following:

Phone: 01953 711 881

Email: sales@esupplyline.com

Live Chat: Available on our website, Monday - Friday, 8:30 - 17:00.

Contact Form: https://esupplyline.com/pages/contact

View full details

3M Scotch-Weld Surface Insensitive Instant Adhesive SI Gel

3M Scotch-Weld Surface Insensitive Instant Adhesive SI Gel is a high-viscosity cyanoacrylate engineered for porous, contaminated, and difficult-to-bond surfaces including wood, leather, cork, and fabric. The gel formulation provides maximum gap filling capability whilst delivering 2900 psi shear strength through fast curing action.

Key Features

  • Surface Insensitive Bonding — Bonds rough, porous, contaminated, and acidic substrates that challenge conventional instant adhesives through specialised chemistry.
  • High-Viscosity Gel Formulation — Non-sag gel consistency fills gaps up to 0.508mm without running or sagging on vertical surfaces.
  • Maximum Gap Filling Capability — Engineered specifically for joints and gaps that conventional thin adhesives cannot effectively bond.
  • 2900 psi Shear Strength — Delivers strong, durable structural bonding suitable for load-bearing applications and demanding assemblies.
  • Fast 6-23 Second Work Time — Rapid curing enables quick project progression whilst providing adequate working time for positioning and alignment.
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Description

Porous Surface Bonding Challenges

Conventional instant adhesives fail on porous materials—wood, cork, leather, cardboard—because surface porosity absorbs and disperses the adhesive, reducing effective bonding. Additionally, these materials often have acidic chemistry that interferes with standard cyanoacrylate cure mechanisms. Scotch-Weld SI Gel addresses these challenges through formulation specifically engineered for porous substrate bonding.

Surface Insensitivity Technology

Standard instant adhesives require clean, non-porous, slightly alkaline surfaces for optimal bonding. SI Gel's surface insensitivity allows bonding on surfaces that would defeat conventional adhesives—rough, contaminated, acidic, and porous substrates all bond effectively. This versatility expands adhesive applications to materials and conditions where conventional products fail.

Gel Viscosity for Gap Filling

Liquid adhesives run and drip on porous surfaces, wicking into material rather than bonding the joint. The gel consistency maintains contact at joint interfaces whilst providing thickness that fills gaps up to 0.508 mm. This controlled delivery improves bonding effectiveness on irregular surfaces compared to thinner liquid formulations.

Cardboard, Veneer, and Fabric Versatility

Packaging, woodworking, and textile repair applications involve materials that bond inconsistently with conventional adhesives. SI Gel's formulation addresses these diverse materials within a single product, simplifying inventory and enabling flexible assembly approaches across material types.

Leather and Cork Specialisation

Leather and cork present unique bonding challenges—their organic composition and porous nature challenge standard adhesives. SI Gel's chemistry is optimised specifically for these materials, enabling reliable bonding where conventional products might fail or provide inadequate durability.

Rapid Curing for Production Efficiency

6–23 second work time allows adequate positioning and alignment whilst enabling rapid cure progression. Projects complete faster than products requiring extended curing, improving production throughput and allowing quick handling of bonded assemblies.

Structural Bonding Durability

2900 psi shear strength indicates substantial load-bearing capability—suitable for structural applications beyond simple assembly. The 24-hour full cure and 82°C maximum operating temperature allow use in demanding applications requiring durable, heat-resistant bonding.

More Information

Application Instructions

Prepare bonding surfaces. Clean surfaces of dirt and loose material; light roughening of smooth surfaces improves adhesion. Unlike conventional instant adhesives, extensive surface preparation is not critical for porous materials.

Ensure surfaces are dry. Moisture interferes with cyanoacrylate cure—allow wet or damp porous materials to dry before bonding.

Dispense adhesive onto one surface. Apply a small amount of gel directly to one bonding surface—the gel thickness makes small quantities effective.

Position surfaces together. Bring bonded surfaces into alignment and apply firm pressure to seat the joint and distribute adhesive.

Hold pressure during curing. Maintain contact pressure for 60–90 seconds to allow initial set and cure to develop.

Release and allow full cure. After initial holding time, the adhesive will set sufficiently for light handling. However, allow 24 hours for full strength development before exposing to design loads.

Avoid excessive adhesive application. Use small quantities—the gel's high viscosity makes less material effective, and excess adhesive wastes product and creates cleanup challenges.

For vertical or overhead joints, provide clamping. Use clamps or fixtures to maintain alignment and pressure during the 24-hour full cure period.

Clean excess adhesive promptly. Uncured excess gel can be wiped away; cured adhesive requires mechanical removal.

Allow temperature stabilisation. Once cured, allow assemblies to stabilise at room temperature before exposure to elevated temperatures (up to 82°C maximum operating).

Specifications

Product Type Surface insensitive instant adhesive gel

Adhesive Classification Cyanoacrylate

Physical Form Gel—non-sag liquid

Product Colour Transparent

Container Format Tube

Container Size 20 g

Viscosity Non-sag gel consistency

Gap Filling Capability 0.508 mm maximum

Work Time 6–23 seconds

Initial Set Time 60–90 seconds holding pressure

Full Cure Time 24 hours at 72°F (22°C)

Shear Strength 2900 psi

Maximum Operating Temperature 82°C (180°F)

Storage Temperature 16–27°C (60–80°F)

Material Compatibility Wood, cardboard, veneer, fabric, cork, leather, and porous materials

Surface Requirements Works on rough, porous, contaminated, and acidic surfaces

Application Type Manual application with tube dispenser

Bonding Mechanism Fast cyanoacrylate chemistry

Clamping Requirement Recommended for load-bearing applications

Indoor/Outdoor Both suitable

Shelf Life Standard cyanoacrylate stability with proper storage

HS Code 3506.10

Documents

FAQs

Can SI Gel bond non-porous materials like plastic and metal, or is it limited to porous surfaces?

SI Gel is engineered for porous materials but also bonds non-porous surfaces effectively. Its surface insensitivity makes it versatile across diverse materials—the formulation works on plastics, metals, glass, and ceramics alongside the porous materials it's specifically optimised for. It is a true multi-material adhesive.

How long must I hold pressure on bonded surfaces before I can release them?

Hold firm contact pressure for 60–90 seconds to allow initial set. After this period, the bond is sufficiently developed for light handling. However, for maximum strength and load-bearing reliability, clamps or fixtures should maintain pressure throughout the full 24-hour cure period.

Will SI Gel work on damp or slightly wet porous materials, or must surfaces be completely dry?

Surfaces should be as dry as possible for optimal curing. Excessive moisture interferes with cyanoacrylate chemistry. However, SI Gel's surface insensitivity provides some tolerance for minor moisture compared to conventional instant adhesives. For best results, allow porous materials to dry before bonding; if slight moisture is present, the adhesive will likely still cure, but strength may be slightly reduced.

What's the maximum temperature these bonds can withstand, and can SI Gel be used in heated applications?

Maximum operating temperature is 82°C (180°F)—the bond maintains integrity up to this temperature. Beyond 82°C, the cyanoacrylate bond may degrade. For applications with elevated temperature exposure, confirm operating temperatures remain below this limit. For higher-temperature applications, epoxy adhesives would be more suitable.

Product Product subtotal Quantity Price Product subtotal
3M Scotch-Weld Surface Insensitive Instant Adhesive SI Gel680211
3M Scotch-Weld Surface Insensitive Instant Adhesive SI Gel680211
£20.99/ea 		£0.00
£20.99/ea £0.00