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3M Scotchfil Electrical Insulation Putty

3M Scotchfil Electrical Insulation Putty

Soft, mouldable electrical insulation putty providing 600V protection for irregular conductor connections and joints up to 80°C when overwrapped with electrical tape.

7000006089

Low stock

⚙ Ideal For

  • Irregular electrical conductor joints
  • Connection and splice insulation
  • Low-voltage cable terminations
  • Connector bulking and protection
  • Complex geometry conductor coverage

✔ Benefits

  • Hand-mouldable soft pliability
  • Conforms to irregular shapes easily
  • Self-sticking/amalgamating surface
  • UL recognised (with tape overwrap)
  • 1000% elongation flexibility
DETAILED DESCRIPTION →
£19.99 GBP
£19.99 GBP
£16.66 Ex. VAT
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🚚 UK Shipping: Standard (£2.99) or FREE on orders over £75.

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Shipping Information

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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

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3M Scotchfil Electrical Insulation Putty

3M Scotchfill is a premium electrical-grade insulation putty engineered for low-voltage conductor protection where irregular geometry or complex connection configurations prevent tape application alone. The soft, pliable mastic formulation is hand-mouldable—simply finger-press into shape around irregular conductor joints, connections, or terminations. Self-sticking and self-amalgamating properties eliminate the need for external adhesive; the material bonds directly to conductors and itself. When overwrapped with 3M Scotch Super 33+ or Super 88 electrical tape, Scotchfill achieves UL recognition providing professional-grade 600V insulation protection up to 80°C.

Key Features

  • Hand-Mouldable Soft Pliability — Formulated specifically for finger-moulding without tools, enabling quick shaping around complex geometries and irregular conductor configurations.
  • Self-Sticking and Self-Amalgamating — Adhesive surface bonds directly to conductors and to itself without external adhesive, simplifying application and reducing material requirements.
  • Exceptional Elongation Capability — 1000% elongation allows stretching over irregular shapes, thick connections, and multi-conductor junctions without material failure.
  • Conforms to Irregular Geometry — Mastic formulation naturally conforms to non-standard shapes - splayed terminals, multi-conductor junctions, irregular clamps - where rigid insulation would fail.
  • UL Recognised with Tape Overwrap — Professional-grade UL recognition when combined with Scotch tape overwrap, providing documented electrical safety compliance for safety-critical applications.
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Description

Irregular Electrical Connections and Insulation Challenges

Electrical systems include diverse connection types—splayed cable terminations, multi-conductor junctions, connector bulks, irregular clamps—where traditional electrical tape cannot conform adequately. Rigid insulation materials bridge gaps and fail to provide complete coverage. Scotchfill addresses this challenge through mastic formulation that naturally conforms to irregular geometries, providing complete insulation coverage where tape alone would prove inadequate.

Hand Application Simplicity and Speed

Traditional conductor insulation requires tools and technical skill—measuring, cutting, wrapping, tensioning. Scotchfill simplifies this process—simply remove from the roll, finger-mould into position, and press firmly. This hand-application simplicity is particularly valuable for field repairs, emergency work, or maintenance situations where tools and materials may be limited. The quick application process reduces labour time and simplifies training requirements.

Self-Amalgamating Bond for Permanent Adhesion

External adhesives complicate application and introduce failure points—adhesive must be applied separately, coordination between materials is required, incomplete coverage creates weak bonds. Scotchfill's self-sticking surface eliminates this complexity—the material adheres directly to conductors and to itself, creating permanent bonds without supplementary adhesive. This self-bonding characteristic simplifies application and ensures reliable adhesion.

Mastic Flexibility for Thermal Cycling and Movement

Rigid insulation materials crack and delaminate when conductors move or expand thermally. Scotchfill's mastic formulation with 1000% elongation capability accommodates thermal expansion, conductor movement, and vibration without cracking. This flexibility is particularly valuable in applications experiencing temperature cycling or mechanical stress.

UL Recognition Path Through Tape Overwrap

Scotchfill alone provides electrical protection; however, UL recognition requires tape overwrap with 3M Scotch Super 33+ or Super 88 electrical tape. This two-layer approach combines Scotchfill's conformability with tape's robust protection—the putty fills irregular geometry, the tape provides mechanical protection and documented UL compliance. This combined approach solves challenges that neither material alone can address.

Multi-Conductor Junction Protection

Large cable terminations or multi-conductor splices create irregular bulks challenging for tape application. Scotchfill's mastic nature allows uniform coverage of complex geometry—simply mould around the junction, compress firmly, and overwrap with tape. This approach eliminates gaps and bridging that occur when tape alone wraps irregular shapes.

Self-Extinguishing Flame Resistance

The self-sticking formulation is self-extinguishing—flame does not propagate through the material. Combined with flame-retardant tape overwrap, this characteristic provides fire safety comparable to professional electrical systems. This safety feature is particularly valuable in enclosed spaces or applications where fire spread represents serious hazard.

More Information

Application Instructions

Ensure the conductor is de-energised. Safety requires power disconnection and verification before handling electrical conductors.

Clean the connection area of debris and oxidation. Use a wire brush or abrasive pad to remove corrosion and contaminants; wipe clean with dry cloth.

Inspect the connection for tightness. Verify all connector bolts are secure before insulation application—loose connections represent serious hazards.

Measure the area requiring insulation. Estimate the coverage needed based on conductor size and connection geometry.

Remove Scotchfill from the roll. Unroll approximately 15–25 cm of putty from the roll, or use pre-measured sections.

Warm the putty slightly if it's cold or stiff. Brief hand-warming improves pliability; avoid excessive heat which may damage the material.

Begin moulding at the base of the connection. Press the putty firmly against the conductor, starting at the junction point.

Stretch and mould upward over the connection. Work the putty with fingers, stretching and pressing to conform around the irregular geometry.

Build up coverage in layers if needed. For thick connections, apply multiple layers, pressing each firmly and allowing slight setting before adding the next layer.

Compress the putty firmly to activate bonding. Press thoroughly with fingers to ensure complete contact and self-amalgamating bonding.

Ensure uniform coverage with no bare areas. Verify no copper or conductor material is visible through the putty—complete coverage is essential for electrical safety.

Allow brief setting time. Wait 5–10 minutes for the self-amalgamating bond to develop before applying tape overwrap.

Overwrap with Scotch Super 33+ or Super 88 tape. Apply electrical tape over the putty-covered area, using 50% overlap between wraps and extending at least 25 mm beyond the putty on both sides.

Press the tape firmly to secure both materials. The tape provides mechanical protection and documented UL compliance when properly applied.

Allow full cure time before energising. Wait several hours or overnight if possible before restoring power.

Specifications

Product Type Electrical-grade insulation mastic putty

Format Roll in single standard size

Material Electrical-grade mastic

Material Type Self-sticking, self-amalgamating mastic

Colour Black

Width 38 mm (38.1 mm)

Length 1.5 m (1.524 m), equivalent to 60 inches

Thickness 3.175 mm

Tape Grade Premium

Voltage Application Low voltage (up to 600V when used as directed)

Voltage Rating 600V (with overwrap)

Dielectric Strength 22,000 V/mil

Temperature Operating Range 0°C to 80°C

Temperature Fahrenheit 32°F to 176°F

Elongation 1000% (exceptional flexibility)

Elongation at Break 10%

Adhesive Type Self-sticking mastic

Self-Amalgamating Yes (bonds to itself and conductors)

Flame Retardant Self-extinguishing

Vulcanizing No (non-vulcanizing)

UV Resistant Yes

UL Recognition Recognised as joint insulation when overwrapped with Scotch Super 33+ or Super 88 Vinyl Electrical Tape

Certification UL recognised (with overwrap)

Primary Application Irregular conductor connection and joint insulation

Secondary Applications Connector bulking, multi-conductor splice protection, termination insulation

Self-Sticking Yes (no external adhesive required)

Hand Application Finger-mouldable without tools

Conformability Naturally conforms to irregular geometries and complex shapes

Thermal Cycling Accommodates thermal expansion and conductor movement

Vibration Resistance Maintains adhesion through mechanical stress

Shelf Life 5 years with proper storage

Smallest Saleable Unit Individual roll

Complementary Products Scotch Super 33+ or Scotch Super 88 electrical tape for overwrap and UL compliance

Storage Temperature 0–25°C optimal

Flexibility Highly flexible and conformable at temperature extremes

Market Sectors Professional electrical, industrial maintenance, utilities

HS Code 3006.10

Documents

FAQs

Can Scotchfill be used alone without tape overwrap, or is the tape absolutely required for electrical safety?

Scotchfill alone provides electrical protection and insulation capability. However, UL recognition (professional-grade compliance documentation) requires tape overwrap with Scotch Super 33+ or Super 88. For professional installations where documented compliance is essential, tape overwrap is necessary. For maintenance applications where UL documentation isn't required, Scotchfill alone may provide adequate protection—assess your specific requirements before deciding. Tape overwrap adds mechanical protection and fire resistance benefits beyond electrical insulation.

How thick should the Scotchfill layer be for adequate insulation coverage?

The mastic naturally conforms and compresses; typically 3–5 mm of compressed putty provides adequate coverage. For more substantial connections, build up in layers—apply one layer, compress firmly, then add additional layers if needed. Complete coverage with no visible conductor material is the key criterion; thickness sufficient to provide uniform coverage is appropriate. Excessive thickness provides no additional benefit; the emphasis is on uniform coverage rather than maximum thickness.

Can Scotchfill be used on connections operating at temperatures approaching the 80°C maximum?

Scotchfill is rated for sustained operation to 80°C maximum. Connections operating continuously at or near 80°C are within specification, though accelerated aging may occur at sustained temperature extremes. For connections with occasional temperature peaks to 80°C (typical industrial equipment), Scotchfill provides reliable performance. For applications with sustained operation near maximum temperature, consider specialised high-temperature alternatives or consulting 3M technical support for guidance.

Does the 1000% elongation mean the putty can be stretched indefinitely, or is there a practical limit?

The 1000% elongation rating indicates the material can stretch to 10 times its original length before breaking. In practical application, this extraordinary elongation allows stretching over irregular shapes, thick connections, and complex geometries. However, the self-amalgamating property and adhesion are optimised when the material is compressed and pressed firmly rather than excessively stretched. The elongation capability accommodates irregular geometry; normal application uses compression and moulding rather than sustained stretching.

Product Product subtotal Quantity Price Product subtotal
3M Scotchfil Electrical Insulation Putty7000006089
3M Scotchfil Electrical Insulation Putty7000006089
£19.99/ea 		£0.00
£19.99/ea £0.00