Sealmaster Seal Type N30

Sealmaster manufactures Intumescent fire and Smoke Seals which are compatible with all types of fire resisting door assemblies. Although the principal seals are intended for 30 or 60 minute rated doors, their design and performance characteristics indicate far longer endurance potential.
The heat-treated Aluminium holder is attractive in appearance, easy to install, and retains the intumescent material securely and correctly positioned in the rebate but without weakening either the frame or door. Robust and durable in use, it offers excellent vandal and damage-resistance, plus good heat conductivity to assist early intumescence.
Sealmasters specially-formulated intumescent material is based on mono-ammonium phosphate, and is compounded to resist degradation by moisture or carbon dioxide. When triggered by heat it produces a low pressure, high volume foam. A high pressure exfoliated graphite foam is combined with Sealmasters traditional material to produce the unique Sealmaster Ultima seal, giving the benefits of high expansion with high pressure to restrict leaf movement in a fire
The flexible and easy-to-replace flame-retarding elastomeric blade seal, acts
as a draught seal in normal use and prevents the passage of hot or cold smoke, noxious gases and flames during a fire thereby keeping escape routes open.
Although the intumescent material remains hard under normal conditions, it intumesces rapidly at approximately 140 degrees centigrade, and achieves a 40-fold volume expansion ratio. All seals contain sufficient intumescent material to ensure that the designed integrity ratings of both 30 and 60 minutes are achieved with comfortable margins.