Av-Dec HT3935-7FR-350 (3.5-Inch-Roll)

HI-TAK PRS® HT3935-7 Polyurethane Sealant Tape

Overview

HI-TAK PRS® HT3935-7 is a pre-cured polyurethane sealant tape with an integral fiberglass carrier, developed by Av-DEC for aerospace sealing and moisture-proofing applications. Designed to provide reliable two-sided sealing between irregular mating surfaces, the tape performs best when compressed between assembled components. Because it is supplied fully cured, it requires no mixing or curing, allowing rapid installation while providing long-term environmental sealing. The product is also available in die-cut gasket configurations and a flame-retardant (FR) version.

Key Technical Specs

• Product Type: Pre-cured polyurethane sealant tape
• Carrier Material: Fiberglass
• Construction: Two-sided sealing tape
• Colour: Plum (HT3935-7)
• Flame-Retardant Version: Amber (HT3935FR)
• Thickness: 0.045 in (1.14 mm)
• Standard Roll Length: 12 ft (3.66 m)
• Available Widths: 0.050 in increments up to 24 in
• Service Temperature: -65°C to +135°C (-85°F to +275°F)
• Shelf Life: Indefinite when stored in original sealed packaging and protected from UV exposure
• Reactivity: Fully cured with no reaction to typical aviation metallic or non-metallic substrates

Approvals & Specifications

• Service temperature qualified in accordance with RTCA DO-160G, Section 5 (2 thermal cycles)
• Manufactured by Aviation Devices & Electronic Components (Av-DEC)

Typical Applications

• Aircraft moisture sealing
• Fuselage and airframe joint sealing
• Environmental sealing between irregular mating surfaces
• Access panel sealing
• Equipment mounting interfaces
• Die-cut gasket applications
• Commercial and military aircraft MRO

Compatibility & Safety Notes

• Supplied fully cured with no chemical reaction to typical aviation metallic or non-metallic surfaces
• Designed to perform under compression between assembled components
• Protect unopened material from prolonged UV exposure during storage
• Store in the original sealed packaging to maintain indefinite shelf life
• Safety Data Sheet (SDS) available from Av-DEC upon request

Packaging & Procurement

• Standard 12 ft (3.66 m) rolls
• Available in widths from 0.050 in increments up to 24 in
• Die-cut gasket configurations available
• Flame-retardant version available as HT3935FR

Why This Product is Chosen for AOG / MRO

• No mixing or curing required, enabling rapid installation during aircraft maintenance
• Provides reliable moisture sealing between uneven or irregular mating surfaces
• Fully cured construction simplifies handling and eliminates cure delays
• Excellent long-term durability across a wide aerospace temperature range
• Easy removal facilitates future maintenance and component replacement
• Available in custom widths and die-cut gasket forms for aircraft-specific applications

Practical Suggestions for Your Team (AOG Mindset)

• Install the tape under adequate compression to achieve optimum sealing performance
• Select the appropriate tape width to fully cover the sealing interface without excessive overhang
• Store unused material in its original packaging away from direct UV exposure
• Specify the HT3935FR variant where flame-retardant performance is required by the aircraft specification
• Consider die-cut gasket versions for repetitive maintenance tasks to reduce installation time and improve consistency

Manufacturer / Aviation Spec Codes

• Manufacturer: Aviation Devices & Electronic Components LLC (Av-DEC)
• Product Name: HI-TAK PRS® HT3935-7
• Product Type: Pre-cured polyurethane sealant tape with fiberglass carrier
• Related Product: HT3935FR (Flame-Retardant)
• Qualification: RTCA DO-160G Section 5
• Primary Application: Aircraft moisture sealing and environmental sealing between irregular mating surfaces