Foil balloons are made from engineered multilayer film rather than a single sheet of metal. Two widely used constructions are commonly described as nylon-film balloons and PET polyester-film balloons.
Typical multilayer structures
A nylon construction combines a nylon base film, a PE heat-sealing layer and a metallized aluminum barrier layer. A polyester construction uses PET film with a PE heat-sealing layer and a metallized layer. Exact structures and layer order can vary by supplier and specification.
Why choose nylon film?
Nylon film generally offers greater toughness, flexibility and resistance to stress. It feels softer and can provide strong gas-barrier performance when the complete laminate, valve and seals are properly engineered.
- Large and oversized balloons
- Helium-filled designs requiring better retention
- Complex shapes and stressed seal areas
- Premium projects where durability is prioritized
Why choose PET polyester film?
PET composite film can deliver good printing, forming and display performance for many conventional products. Its competitive cost makes it a common choice for price-sensitive retail and promotional orders.
- Standard-size air-filled balloons
- High-volume promotional projects
- Products with strong target-cost requirements
- Applications with moderate display-time needs
Material name alone does not guarantee quality
Balloon performance depends on the complete specification: film grade and thickness, lamination bond, ink system, heat-seal settings, seal width, valve quality, product geometry and inflation pressure. A well-engineered PET balloon can outperform a poorly produced nylon balloon.
UNDALO selection guidance
For very large balloons, standing structures and helium applications, UNDALO normally recommends evaluating nylon composite film first. PET remains practical for many regular sizes when testing confirms the intended use, display period and target cost.
BUYER FAQ
Frequently asked questions
Is nylon always better than PET?
No. Nylon is often preferred for demanding applications, while PET can provide reliable performance and better cost efficiency for many standard products.
Which film is recommended for helium balloons?
A suitable nylon composite is often preferred, but the valve, seals, thickness and final retention test are equally important.
Why can balloons using the same film perform differently?
Film thickness, lamination, sealing, valve quality, geometry and inflation pressure all affect the finished balloon.