3M SCOTCH WELD - No.70 (25.4-mm-Roll)

Additional Product Information

3M SCOTCH WELD – No.70 is trusted across the aviation industry because it delivers unmatched electrical insulation, arc resistance and Class H (180 °C / 356 °F) performance. From MRO crews maintaining the world’s most advanced military aircraft to aircraft engineers ensuring the safety of millions of passengers every year. This self-fusing silicone tape is a proven solution for high-voltage terminations and repairs. Ground crew and AOG teams depend on it for its reliability in extreme conditions, protecting critical systems from ozone, moisture and tracking. That’s why the 3M SCOTCH WELD – No.70 remains the go-to choice for aviation professionals worldwide.

Key Technical Specs for 3M SCOTCH WELD - No.70

• Material: Self-fusing inorganic silicone rubber.
• Width: 25.4 mm (1.0 in)
• Length per roll: ≈ 9.14 m (30 ft / 9.1 m) typical for the 25 mm x 9.14 m SKU.
• Thickness: ~0.3 mm (≈ 12 mil).
• Temperature rating: Class H, continuous operation up to 180 °C (356 °F). Workable at very low temperatures.
• Electrical / safety: High dielectric strength, excellent arc and track resistance. Meets aerospace/industry requirements for high-voltage cable protection.
• Weather resistance: High ozone and weather resistance, suitable for outdoor and high-altitude use.
• Colour: Sky blue / grey.
• Shelf life: Manufacturer lists shelf life ~5 years.

Approvals & Specifications for 3M SCOTCH WELD - No.70

• Military / Federal / industry spec: Scotch 70 is commonly listed as meeting A-A-59163 Class I, Type I in supplier and 3M literature. An important spec for aerospace electrical tapes. Many equivalent silicone self-fusing tapes are also offered to meet A-A-59163.
• Standards / tests: 3M datasheets reference ASTM test data and performance in termination/arc tests. For aircraft OEM acceptance you must still confirm the exact part number with the aircraft wiring repair manual and supplier list for each platform.

Typical Aircraft MRO / AOG Applications for 3M SCOTCH WELD - No.70

• Primary uses: overwrap protection of high-voltage cable terminations and splices to prevent arcing and tracking. Environmental sealing of outdoors and exposed terminations, base layer for re-enterable connections and stress-cone assemblies. It’s especially used on HV power distribution, bus bars and large splices.
• Why MRO/AOG teams keep it stocked: it’s a small, lightweight consumable that prevents catastrophic cable failures, having rolls on-site enables rapid AOG repairs and safe re-entry of connections. A correctly applied self-fusing overwrap can extend the life of a termination, stop a developing tracking and arcing fault and prevent flight-critical electrical outages. Therefore it’s a low-cost, high-impact item for both scheduled MRO and urgent AOG work.

Compatibility & Safety Notes for 3M SCOTCH WELD - No.70

• Compatibility: suitable as an overwrap on cables insulated with butyl rubber, oil-based rubber, ethylene-propylene rubber, PVC, LDPE/HDPE and cross-linked polyethylene (XLPE). It is non-adhesive so it does not leave residue on conductors and is compatible with common cable splice compounds, but always check splice compound OEM compatibility for long-term installs.
• Safety & practical use: apply in half-lap layers with moderate, consistent tension to ensure full fusion and no voids, maintain manufacturer recommended layer counts on HV terminations. Because it’s Class H rated and has excellent arc/track resistance, it’s suitable for on-wing AOG repairs and ground crew use, but final approvals for permanent repairs must follow the aircraft OEM or airline maintenance procedures. Always consult the aircraft wiring repair manual before a permanent installation.

Packaging & Procurement for 3M SCOTCH WELD - No.70 (matched to the Aerospheres page and common market packs)

• Roll Dimensions: 25.4 mm (1 in) wide × 9.14 m (30 ft) long × ~0.305 mm (12 mil) thick.
• Single Roll Packaging: Usually supplied individually per carton (1 roll/carton).
• Case Pack: Common distributor pack is 24 rolls per case.
• Aerospheres Part Numbers:

• Aerospheres P/N: 101503
• 3M OEM P/N: 7000006225

• Shelf Life: ~5 years (60 months) when stored in a cool, dry environment.
• Procurement Notes: Lightweight, compact roll, easily added to AOG kits or MRO stock bins. Ensure to track OEM P/N and Aerospheres P/N in ERP/MRP for traceability.

Why 3M SCOTCH WELD - No.70 is Chosen for AOG / MRO

• Fast repairs: Self-fusing tape allows quick, secure high-voltage fixes during AOG situations.
• High-temp & electrical protection: Class H (180?°C / 356?°F) with excellent dielectric and arc resistance.
• Durable & versatile: Resists moisture, ozone and weather. Ideal for terminations, splices and stress cones.
• Compact & trusted: Lightweight, easy to store in AOG kits, used across commercial and military aircraft to prevent costly downtime.

Practical Suggestions for Your Team (AOG mindset) for AeroShell Grease 22

• Keep at least 1–2 rolls per AOG kit (25.4 mm × 9.14 m / 1 in × 30 ft), plus additional rolls on fast-move consignment for larger bases. Label with OEM P/N 7000006225 and your internal AERO part number for traceability.
• Train ground crew and MRO technicians on correct half-lap tensioned wrapping technique and required layer counts for common termination types. Carry the 3M datasheet and the aircraft wiring repair manual procedure in the kit for immediate reference.
• For procurement, set reorder points tied to stock on hand and historical AOG draw so you never dip below one AOG-kit allocation.

Manufacture / Aviation Spec Codes for 3M SCOTCH WELD - No.70

• 3M OEM Part Number: 7000006225
• Aerospace / Federal Specification: A-A-59163 Class I, Type I
• Temperature Class: Class H (180?°C / 356?°F)
• Applicable Aircraft OEM References: Listed in Boeing distribution catalogues. Check Airbus, Lockheed Martin and other OEM approved materials lists for platform-specific approvals.
• Regulatory / Compliance: RoHS compliant, ECCN EAR99

Alternative Names & Descriptions for 3M SCOTCH WELD - No.70

• Scotch 70
• 3M Tape 70 (3M P/N 7000006225)
• Scotch 70 Silicone Rubber Electrical Tape (self-fusing)
• 3M SCOTCH WELD - No.70 (25.4-mm Roll)
• 3M70
• SCOTCH-No.70