6 Things You Need to Know About Composite Molding Tapes
In 2026, composite molding continues to gain momentum as a versatile and valuable manufacturing process across a range of industries, including aerospace, automotive, renewable energy, marine, and advanced electronics.
While not a new technology, its applications are expanding as these sectors increasingly prioritize lightweight, high-performance, and durable components, which are supported by purpose-built advanced tapes that can streamline production and quality.
Composite molding involves layering reinforcing fibers with a resin matrix, then applying heat and pressure to form a rigid, resilient structure. The resulting parts are known for their strength-to-weight ratio, resistance to environmental stress, and design flexibility, making them ideal for everything from aircraft wings and wind turbine blades to electric vehicle bodies, marine hulls, sports equipment, and medical devices.
As demand grows for efficient and sustainable solutions, composite materials are playing a key role in helping manufacturers meet strict performance and safety standards, while also supporting innovation in product design and functionality.
But, what is a must-have in the composite molding process?
Whether in aerospace, automotive, renewable energy, or other high-performance sectors, composite molding tapes are essential. Their ability to protect tooling, create smooth surfaces in composite molding applications, reduce labor costs, extend mold life and improve production throughput makes them crucial for parts manufacturers and MRO (Maintenance, Repair, and Overhaul) professionals. Learn more on our dedicated composite molding resource page.
In this story, let's explore 6 things you need to know about composite molding tapes, engineered to improve outcomes at every stage of composite part fabrication, from molding and curing to surface protection and final assembly.
In this article
- 1. There is a global market demand for composite adhesive tapes
- 2. Specialty tapes provide an advantage over traditional solutions
- 3. They can be used as mold release liner, protection and seaming tape, or a flash masking and hold down tape
- 4. They are ideal removable surface protection solutions
- 5. Tapes can serve as a visual indicator
- 6. Non-PFAS alternatives can be used for composite molding process consumables
- Scalable, Customizable Composite Molding Tapes
Composite molding tapes are clean, efficient, reusable, and built for performance. According to Precedence Research, as of 2025, the global composite adhesive market is valued at USD 4.08 billion and is projected to grow at a CAGR (compound annual growth rate) of 5.21% from 2025 to 2034, reaching approximately 6.43 billion by 2034.
The Precedence Research report also indicates the regional breakdown of the composite adhesive tape market is as follows:
- Asia Pacific: 49%
- North America: 24%
- Europe: 21%
- Latin America: 2%
- Middle East & Africa: 2%
This growing demand is driven by lightweighting, fuel efficiency initiatives, electrification, and sustainability goals, particularly in automotive, aerospace, construction, and wind energy. These trends are increasing the need for high‑performance adhesives and tapes that enhance structural integrity and protect against shock, temperature extremes, and chemical exposure, while improving downstream efficiency in paint lines and other finishing operations.
In industries where precision, repeatability, and surface quality are critical, such as aerospace, life sciences, or premium automotive, composite molding tapes offer a distinct performance edge.
Specialty composite molding tapes are engineered for high‑pressure, high‑temperature environments typical in autoclave or vacuum‑assisted molding. These tapes:
- Do not deform, peel, or leave residue
- Provide clean, consistent release from the part and mold
- Reduce the risk of surface defects
- Are reusable and easy to apply, improving throughput and reducing rework before paint lines or bonding
In contrast, silicone‑based masking or liquid coatings often require long application/removal times, create inconsistent coverage, and may leave residue, leading to downtime, rework, or scrapped parts.
Composite molding tapes are available in several specialized forms, each supporting a unique part‑making requirement. They can be used as:
- Mold release liners
- Tool protection and seaming tapes
- Flash masking and hold‑down tapes
Mold Release Liners
Mold release liners, typically made from PTFE (polytetrafluoroethylene) ensure a clean, easy release of composite parts. PTFE tape products are available as glass cloth, laminates, or films and are produced through proprietary processes that eliminate common flaws such as cracks or pinholes, helping deliver cleaner surfaces heading into paint lines.
Tool Protection & Seaming Tapes
Skived or extruded PTFE films provide high conformability and flexibility, allowing prolonged protection of complex tool surfaces while preventing resin buildup.
Flash Masking & Hold‑Down Tapes
Made from high‑temperature polyester backings with silicone or rubber adhesives, these tapes help control resin flow (“flash”) and remove cleanly without residue, improving bond‑line quality and first‑pass yield in paint lines and assembly.
One of the most valuable roles of composite molding tapes is temporary yet durable surface protection.
Saint‑Gobain® Tape Solutions provides a comprehensive portfolio designed to shield sensitive surfaces from abrasion, debris, moisture, and chemicals during handling, assembly, or transport.
PTFE glass laminate tapes are often preferred because they are:
- Free of pinholes and cracks
- Capable of lasting up to 20× longer than lower‑grade alternatives
- Designed for exceptional mold life extension and fewer defects carried into paint lines
Composite molding tapes, which are designed for tool protection and mold release, are available in distinctive and highly visible colors such as bright yellow, orange, or blue. These contrasting shades enable these tapes to act as a visual indicator during the lay-up and molding process, making it easy for technicians to see which areas of the mold or tooling have been properly covered and which may have been missed. By serving as a visual guide, these tapes can help reduce the likelihood of human error and ensure consistent process and application. This is especially important when working with large or complex molds, such as those used in aerospace structures or wind turbine blades, when even small uncovered sections can result in defects or costly rework.
To support environmental goals, Saint‑Gobain has developed non‑PFAS alternatives to replace ETFE and FEP films. One such solution is PMP film, which offers:
- Low surface energy
- Performance similar to ETFE/FEP in release applications
- No PFAS‑related disposal, tracking, or regulatory challenges
PMP film is offered in matte and glossy formats in thicknesses including 1.5, 2, 3, and 5 mil.
Saint‑Gobain also offers a pressure‑sensitive adhesive tape for edging, tool lining, seaming, and splicing. PMP film withstands composite‑curing temperatures of 180 °C (356 °F), making it suitable for high‑performance resin systems. (Corrected °F value for clarity.)
For more information about non‑PFAS options, contact Richard Austin (1‑518‑894‑5326, [email protected]). Or, explore our composite molding tape portfolio online.
Saint‑Gobain Tape Solutions offers a full range of PTFE glass laminate tapes, PTFE glass cloth tapes, PTFE film tapes, tool protection tapes, and flash masking solutions to support next‑generation composite manufacturing, including specialized options to streamline paint lines and downstream finishing.
As industries advance toward renewable energy, electrification, and lightweight mobility, Saint‑Gobain is equipped with scalable, customizable advanced tapes engineered for new material systems, curing processes, and tooling surfaces.
Connect with our team to determine the best composite molding tape for your application, or partner with us to custom‑engineer advanced tapes tailored to your performance, cost, and manufacturing needs.