Description

Pemko 303_S Standard Perimeter Gasket with Silicone Insert

The Pemko 303_S Standard Perimeter Gasket with Silicone Insert is designed to provide dependable perimeter sealing for door frames, helping prevent air, smoke, sound, dust, and moisture infiltration. Mounted on the side of the frame, this gasket seals gaps up to the depth of its silicone insert, making it a reliable solution for commercial, institutional, and high-performance building applications.

Built with a durable aluminum retainer and a high-performance black silicone insert, this perimeter gasket delivers long-lasting protection in demanding environments. The silicone material is stable, non-reactive, and resistant to extreme temperatures, sunlight, ozone, oxidation, and water. In addition, it performs well in areas that require frequent cleaning with disinfectants, making it suitable for healthcare, education, and public facilities.

Key Features

• Seals gaps up to the depth of the silicone insert
• High-performance silicone extrusion (solid or foamed with protective skin)
• Punched on 6″ centers with slotted holes for easy adjustment
• Available with self-adhesive backing, two-sided tape (TST), or screw-applied installation
• Suitable for use as a perimeter gasket or meeting stile seal
• Resistant to sunlight, weather, ozone, oxidation, water, and flame
• Ideal for areas requiring frequent cleaning with disinfectants

Benefits

• Helps prevent air, smoke, sound, dust, and moisture infiltration
• Maintains flexibility and stability in extreme environments
• Durable and long-lasting under normal exposure conditions
• Clean, professional installation on the side of the door frame

Specifications

• Base Material: Aluminum
• Insert: Black Silicone
• Fasteners: Self-Adhesive, Two-Sided Tape, or PHSMS #6 x 5/8″
• Mounting Location: Side of Frame
• Mounting Type: Screw Applied
• Height: 1/4″
• Overall Height: 1/4″
• Profile Height: 7/8″
• Maximum Length: 185″
• Minimum Length: 24″
• Weight: 0.07 lbs

Available Finishes

• 303AS: Mill Finish Aluminum with Black Silicone Insert
• 303BSPS: Black Suede Powder Coat Aluminum with Black Silicone Insert
• 303DS: Dark Bronze Anodized Aluminum with Black Silicone Insert

Certifications & Ratings

• GREENGUARD Gold Certified
• UL 4L10 Listed
• UL 1784 – Air Leakage Tested
• UL 10C – Positive Pressure Fire Rated
• ASTM E283-04 (2012)
• ANSI/BHMA A156.22 Compliant

The Pemko 303_S Standard Perimeter Gasket with Silicone Insert delivers dependable, code-compliant sealing performance for doors that require air control, smoke containment, and long-term durability in demanding environments.