NGP 5100 Silicone Mullion Seal...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$37.00
$28.87
NGP 5100 Silicone Mullion Seal 86" Gray - self-adhesive flat strip, top view

NGP 5100 Silicone Mullion Seal 86" with Self-Adhesive Mounting

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Model: 5100N-86
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$37.00
$28.87
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NGP 5100 Silicone Mullion Seal 86" with Self-Adhesive Mounting

The NGP 5100 Silicone Mullion Seal is an 86" self-adhesive gasketing strip for commercial mullion applications where doors close against a fixed mullion face. The profile measures 1-1/8" wide x 3/32" thick and is constructed from synthetic rubber polymer siloxane closed-cell sponge. Temperature range is -100 F to 500 F. Certified to ANSI/BHMA A156.22. Available in Black Silicone and Gray.

Features

  • Dimensions: 86" length, 1-1/8" width, 3/32" thickness for direct mounting to mullion faces.
  • Temperature Range: -100 F to 500 F, maintaining flexibility at both extremes.
  • Material: Synthetic rubber polymer siloxane closed-cell sponge with excellent flexibility and memory.
  • Mounting: Modified acrylic pressure-sensitive adhesive with release liner for permanent self-adhesive installation.
  • Certification: ANSI/BHMA A156.22 certified for heat and cold performance.
  • Fire Suppression Compatibility: Flame-resistant construction recommended for areas using FM200 or Halon fire suppression systems.
  • Weather Resistance: Resistant to ozone, UV radiation, aging, weathering, water, detergent, alcohol, and chemical exposure.
  • Shelf Life: One year when stored at 75 F and 50% relative humidity or less.

Typical Applications

  • Commercial office and institutional double-door mullion systems
  • Healthcare and education facility environmental sealing
  • Fire-rated door assemblies with FM200 or Halon suppression systems
  • Retail and government building entry systems

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Gasketing
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

NGP 5100N-86 – Frequently Asked Questions

1) Where does the NGP 5100 mullion seal actually mount on a pair of doors?
The 5100 sticks to the face of the mullion, on the side the doors close against, so the door edges compress against the seal rather than metal. It's a peel-and-stick strip: modified acrylic pressure sensitive adhesive under a release liner, so there's no drilling and no fasteners to line up. Clean the mullion face first, since the adhesive is meant to be permanent once it's down.
2) How long is the NGP 5100 silicone mullion seal, and will one piece cover a standard 7 foot opening?
Each 5100 strip runs 86 inches, which is 7 feet 2 inches, so a single piece covers a standard 84 inch mullion with a couple of inches to trim off. For taller openings you'll be butting a second strip, and the silicone sponge cuts clean with a sharp blade.
3) Will a silicone mullion seal hold up in an unconditioned space or next to a boiler room door?
Temperature is where this one earns its keep. The 5100's siloxane closed cell sponge is rated from -100 F to 500 F and stays flexible at both ends, so it doesn't go stiff in a walk-in cold environment or take a set next to heat. It's also resistant to ozone, UV, aging, weathering, water, detergent, alcohol, and chemical exposure, which is why it survives exterior and washdown openings that kill vinyl.
4) Is the NGP 5100 mullion seal certified to any gasketing standard?
It's BHMA certified to ANSI/BHMA A156.22, the gasketing and door bottom standard, specifically to the heat and cold performance tests. If your spec calls out A156.22 gasketing on the drawing, the 5100 meets it as written.
5) What seal should I use on a room protected by an FM200 or Halon fire suppression system?
The NGP 5100 silicone mullion seal is recommended for FM200 and Halon protected areas. Those systems only work if the room holds concentration, so the door-to-mullion gap is a real leak path, and the 5100's siloxane construction is flame resistant and compatible with the suppression chemicals. It's the reason this seal turns up in data rooms and equipment rooms rather than a generic vinyl bulb.
6) How wide and thick is the NGP 5100 seal profile?
The strip is 1-1/8 inches wide and 3/32 inch thick. That thin profile matters on a mullion: it takes up almost no space in the gap, so it seals the door-to-mullion line without pushing the doors out of alignment or interfering with latching into a rim strike.
7) What is the difference between a mullion seal and perimeter gasketing? Do I need both?
They seal different lines. The 5100 is a self-adhesive strip for the face of a mullion between a pair of doors, so it closes the gap where the two leaves meet the mullion. Perimeter gasketing seals the head and jambs of the frame itself, and it is usually a channel product rather than a stick-on strip. The Cal-Royal PG-601 is that style, an aluminum channel with a vinyl insert. On a mullion pair you typically want both: perimeter gasketing around the frame, the 5100 on the mullion face.
8) What colors does the NGP 5100 mullion seal come in?
Two: black silicone and gray. Pick by what the mullion is finished in, since the strip sits on the visible face of the mullion where it will be seen from the corridor. Dark anodized or painted mullions take the black, mill or light finishes disappear better behind gray.
9) How should the NGP 5100 seal be stored before installation?
Adhesive-backed silicone has a clock on it. The 5100 carries a one year shelf life stored at 75 F and 50 percent relative humidity or less. If you're buying ahead for a multi-building rollout, keep it in conditioned storage, not a truck or an unheated warehouse, or the pressure sensitive adhesive loses its initial grab.
10) Is the NGP 5100 mullion seal rated for commercial use or is it a residential weatherstrip?
Commercial. The 5100 is a commercial door hardware gasketing product, built for the openings that see traffic all day, office and school double doors, healthcare corridors, retail entries, and government security doors. It isn't a household weatherstrip repackaged.
How fast can I get the NGP 5100N-86 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the NGP 5100N-86 come with a warranty?
Absolutely. The NGP 5100N-86 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the NGP 5100N-86?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the NGP 5100N-86 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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