SpecSeal Mullion Plug

SpecSeal Curtain Wall Mullion Plugs are fire-retardant foam plugs designed to the size and shape required to easily fit into the voids in the aluminum curtain wall framing members. The resilient foam plug absorbs sound, offers stability under varying environmental temperatures, while functioning as a fireblock and smoke-sealing system within the hollow aluminum framing. The intumescent plugs expand 10-15 times in high temperatures effectively impeding the passage of fire, smoke, and hot gases.

Test Standards ASTM C423
UL 94 Classification HF-1

Third Party Approvals

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Features

Incorporates 2-part intumescent foam technology to expand 10-15 times
No additional wet sealants or foams required
Leakage rated for less than 1 CFM
Sound absorbing (NRC Tested)
Non-halogenated, zero VOC’s

Applications

Curtain Wall

Properties

Permanent

Finished Product

Flexible

Intumescent

Light Weight

Low VOC

No Expiration

Noise Reduction

Specifications

Property	Value
Color	Gray/Black
Foam Component	Flame retardant polyester polyurethane foam, UL 94 Classification HF-1
Expansion Ratio	10x to 15x
Intumescent Onset Expansion Temperature	350 F to 400 F
Density	0.1 g/cu cm (6.4 lb/cu ft)
In Service Temperature	Less than 130 F (54 C)
Shelf Life	Unlimited (when stored properly)
L-Rating	Less than 1 CFM
Noise Reduction Coefficient (ASTM C423)	0.75