GS43MR (0.5-Inch-Roll)

GS# 43MR High Temperature Vacuum Bag Sealant Tape

Overview

GS# 43MR Sealant is an ultra-premium, high-temperature vacuum bag sealant tape developed by General Sealants, Inc. for aerospace composite manufacturing. Formulated from advanced synthetic rubber compounds, it provides exceptional room-temperature tack, excellent adhesion to vacuum bagging films and tooling surfaces, and clean release after cure. Designed for extended oven and autoclave cure cycles, GS# 43MR maintains sealing performance from room temperature up to 232°C (450°F), making it ideal for aerospace composite lay-up and curing operations.

Key Technical Specs

• Product Type: High-temperature vacuum bag sealant tape
• Chemical Base: Advanced synthetic rubber
• Colour: Off-white
• Specific Gravity (ASTM D792): 1.16
• Total Solids: 100%
• Penetration (ASTM D217): 55-65 (5.5-6.5 mm)
• Rolling Ball Tack (ASTM D3121): <3.0 cm (11/16" ball)
• Elongation (ASTM D1000): >1000%
• Weight Loss (ASTM C771): <3.0%
• Service Temperature: Room temperature to 232°C (450°F)
• Odour: None
• Shelf Life: 1 year (stored at 22°C / 72°F)

Approvals & Specifications

• Approved on aerospace specifications worldwide
• Designed for aerospace oven and autoclave composite cure cycles
• Tested to ASTM D792, ASTM D217, ASTM D3121, ASTM D1000 and ASTM C771

Typical Applications

• Vacuum bag sealing for composite lay-up
• Autoclave curing processes
• Oven-cured composite manufacturing
• Aerospace tooling seal applications
• Composite repair vacuum bagging
• Aircraft composite manufacturing and MRO

Compatibility & Safety Notes

• Apply only to clean, dry tooling surfaces for maximum sealing performance
• Compatible with a wide range of vacuum bagging films and tooling materials
• Use a pressure roller after film installation to achieve the optimum vacuum seal
• Non-hazardous under normal handling conditions, but wash hands before eating
• Do not ingest the product
• Store in the original sealed packaging at approximately 22°C (72°F) in a dry environment

Packaging & Procurement

• Supplied as extruded rolls on release liner
• Standard Size: 1/8" � 1/2" � 25 ft (40 rolls per case)
• Standard Size: 1/8" � 3/4" � 25 ft (28 rolls per case)
• Custom extruded sizes available upon request

Why This Product is Chosen for AOG / MRO

• Excellent room-temperature tack simplifies vacuum bag assembly
• Maintains reliable sealing throughout long, high-temperature cure cycles
• Clean removal from tooling reduces post-cure clean-up time
• Compatible with most aerospace bagging films and tooling materials
• Fast hand application without specialised equipment improves repair efficiency
• Suitable for both OEM composite production and aircraft composite repairs

Practical Suggestions for Your Team (AOG Mindset)

• Clean and dry tooling surfaces thoroughly before applying the sealant tape
• Press the tape firmly into position by hand before removing the release liner
• Use a roller over the complete seal area after applying the vacuum bagging film to maximise vacuum integrity
• Choose wider tape sizes for complex tooling or larger vacuum bag flanges
• Keep unused rolls sealed in their original packaging to maximise shelf life and tack performance

Manufacturer / Aviation Spec Codes

• Manufacturer: General Sealants, Inc.
• Product Name: GS# 43MR Sealant
• Product Type: High-temperature vacuum bag sealant tape
• Chemical Base: Synthetic rubber
• Service Temperature: Ambient to 232°C (450°F)
• Primary Application: Aerospace composite vacuum bagging, oven curing and autoclave processing