Marcy Foam-Core Butyl Tape — 8mm × 10ft | Individually Boxed | ME810B
✅ In Stock
Marcy ME810B foam-core butyl tape in a single-application box — the wider 8mm profile for windshield and fixed-glass installations requiring a larger bead. The foam center delivers compression deflection and rebound that solid butyl cannot match, creating a leak-proof seal even when the glass settles unevenly during cure. Ideal for vehicles with wider pinch weld channels, sunroofs, backsliders, and custom van or RV windows where a fuller butyl profile is needed. Many Ford, Lincoln, and Mercury OE installation procedures require foam-core butyl — ME810B covers those platforms when 8mm is specified. Individually boxed and ready to use on the job.
Specifications
- Part Number: ME810B
- Size: 8mm × 10ft
- Core Type: Foam-core
- Format: Individually boxed (single-application)
- Application: Windshield, sunroof, backslider, and fixed-glass installation
Application
Apply to the pinch weld or vehicle channel before setting the glass. The 8mm profile is used when a wider channel or heavier bead is required. Designed for urethane-bonded fixed-glass installations where foam-core butyl is specified. Not intended for mechanically-fastened glass — use solid-core butyl for those applications.
What is foam-core butyl and why is it different from solid-core?
Foam-core butyl has a cellular foam center wrapped in butyl. The foam compresses as the glass is set and rebounds to fill gaps and voids, creating a conforming, leak-free seal. Solid-core butyl seals well but doesn't have the same rebound. Ford, Lincoln, Mercury OE procedures and many professional installation quality standards require foam-core because of this superior void-filling and leak-resistance characteristic.
When should I use 8mm vs. 6mm foam-core butyl?
The 8mm profile (ME810B) is used when the OEM procedure or the vehicle's pinch weld channel calls for a wider bead — typically larger vehicles, vans, trucks with wide channel openings, or custom van and RV windows. The 6mm profile (ME612C) covers the majority of standard passenger cars and light trucks. When in doubt, match to the OEM procedure or measure the channel width.
Which vehicles require foam-core butyl by OEM spec?
Many Ford, Lincoln, and Mercury vehicles specifically call out foam-core butyl in their OEM windshield installation procedures. When servicing a Ford platform, default to foam-core. For other makes, refer to the vehicle-specific procedure — both foam-core and solid-core are used industry-wide, and using the wrong type can affect seal quality.
Does foam-core butyl work in cold weather?
Yes. Marcy foam-core butyl remains workable across a wide temperature range. In temperatures below 40°F, warm the tape slightly before application to improve conformability and adhesion to the pinch weld. Avoid overheating — excessive heat will deform the foam core before the glass is set.
Why is individually boxed butyl useful for mobile installers?
The Butyl-in-a-Box format keeps the tape clean and protected from dust, UV, and contamination until needed. For mobile installers working from a van or truck, it eliminates the handling issues of unwrapped bulk rolls and simplifies per-job material tracking. Each box contains a single-application length — open, use, done.