3M™ Glass Cloth Tapes

Why 3M™ Glass Cloth Tape 398FR?

3M™ Glass Cloth Tape 398FR is an industry-grade, flame-retardant tape designed to outperform in high-heat, high-stress environments. With its abrasion-resistant glass-cloth backing, powerful acrylic adhesive, and F.A.R. & MIL-compliant flame resistance, it delivers lasting performance in aerospace, automotive, and high-temperature industrial applications.

This tape resists puncture, tearing, and temperature up to 121°C (250°F). Available with a blue polyethylene film liner and skip-slit liner for simplified handling and precision application.

Where 3M 398FR Excels

Permanent sealing of high-temperature ducts and chambers
Surface protection in abrasive environments
Clean-removal masking during heat treatment
Wire harnessing and bundling
Aerospace interiors & maintenance
General industrial use requiring flame resistance

Benefits of 3M™ Glass Cloth Tape 398FR

Flame-Retardant: Certified to F.A.R. 25.853 & Boeing BMS 5-146 Type I
Durability: Excellent puncture, tensile and abrasion resistance
Temperature Resilience: Withstands up to 250°F (121°C)
Clean Application: Skip-slit liner for precise, easy installation
Versatile Bonding: High tack acrylic adhesive adheres to a wide range of surfaces
Regulatory Compliance: Meets EU Directive 2003/11/EC for flame retardants

Why Partner with a 3M Select Converter like EKO-TECH?

Certified Expertise: As a 3M Select Converter, we ensure material performance and technical integrity at every step.
End-to-End Support: From prototype to production, we collaborate closely to meet application-specific needs.
Proven Reliability: With decades of converting excellence, we deliver consistent quality and precision.

Custom Converting – Tailored to Your Needs

EKO-TECH enhances the functionality of 3M™ Glass Cloth Tape 398FR through advanced converting:

Rewinding: To custom roll lengths based on your application setup
Slitting: To precise widths for wire wrapping, masking lines, or sealing strips
Sheeting: For cut-to-size panels and patching
Die Cutting & Kiss Cutting: For intricate part shapes, labels, and peel-off sections

Let us help you define the perfect format for your process, whether you’re scaling production or refining prototypes.

Technical data

Adhesive Type Acrylic
Application Splicing Flame-Retardant Tape
Back Side Adhesive Thickness 2 mil
Back Side Adhesive Thickness 0.05 mm, 0.13 mm
Backing (Carrier) Material Glass Cloth
Backing (Carrier) Thickness 5 mil
Backing (Carrier) Thickness 0.13 mm
Brands 3M™
Case Quantity 8/case, 12/case, 24/case
Core Size (Imperial) 3 in

Core Size (Metric) 7.62 cm
Elongation at Break 5.0 %, 7.0 %
Indoor/Outdoor Indoor/Outdoor
Industries General Industrial, Military & Government, Transportation, Automotive, Construction, Specialty Vehicle, Aerospace
Maximum Operating Temperature 121 ℃
Maximum Operating Temperature 250 ℉
Minimum Operating Temperature -29 ℃
Minimum Operating Temperature -20 ℉
Product Color White
Shelf Life 24 Month

Smallest Saleable Unit Roll
Specifications Met ASTM
3330, D3652, ASTM D3758, F.A.R. 25.853(a)
Tensile Strength 2080.0 oz/in
Tensile Strength 227.7 N/100mm
Total Tape Thickness without Liner 7 mil
Total Tape Thickness without Liner 0.18 mm
Units per Case 8.0, 12.0, 24.0, 36.0, 48.0
Overall Length 36 yd
Overall Length 32.9 m, 32.91 m
Overall Width 0.75 in, 1 in, 2 in, 3 in, 4 in, 6 in
Overall Width 10.2 cm, 19.05 mm, 25.4 mm, 50.8 mm, 76.2 mm, 152.4 mm

FAQ

What substrates does the tape adhere to?Emilia Lubecka2025-06-26T10:19:48+02:00

What substrates does the tape adhere to?

It bonds well to metals, composites, glass, and a wide variety of industrial surfaces.

Is it suitable for clean removal applications?Emilia Lubecka2025-06-26T10:17:45+02:00

Is it suitable for clean removal applications?

Yes, it’s designed for clean removal with minimal residue, even after heat exposure.

Can you convert this tape into custom shapes?Emilia Lubecka2025-06-26T10:16:11+02:00

Can you convert this tape into custom shapes?

Absolutely. We offer die-cutting and kiss-cutting tailored to your part geometries.

What temperatures can 3M Glass Cloth Tape 398FR withstand?Emilia Lubecka2025-06-26T10:14:47+02:00

What temperatures can 3M Glass Cloth Tape 398FR withstand?

It performs reliably up to 121°C (250°F).

Is 3M 398FR compliant with flame safety standards?Emilia Lubecka2025-06-26T10:13:10+02:00

Is 3M 398FR compliant with flame safety standards?

Yes. It meets F.A.R. Part 25.853(a), 25.855(d), MIL A-3316C and Boeing BMS 5-146 specs.

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Ready to Optimize with 3M™ Glass Cloth Tape 398FR?

Partner with EKO-TECH today to get custom-tailored rolls, sheets, or die-cut parts of 3M™ Glass Cloth Tape 398FR. We’ll help you get the right shape, size, and performance for your toughest environments.