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Mylar sheet mainly takes polyethylene terephthalate as the main raw material, adopts advanced process formulation and tensile process to produce. With its unique physico-chemical properties, it demonstrates wide application potential in modern industrial and social life.

As technology continues to advance and the global economy recovers, the market demand forMylar sheet is increasing.Mylar sheet, represented by polyethylene terephthalate (PET), is rapidly becoming a core material in packaging,electronics, architecture, transportation, new energy and other fields. In this paper, the application ofMylar sheet will be discussed in order to provide useful reference for researchers and practitioners in relevant fields.

What is Mylar sheet?

Mylar sheet, also known as PET film, is athermoplastic polymer material, mainly composed of polyethylene terephthalate (PET), processed through a specific process. It is usually made by squeezing a thick plate and then stretching it in both directions (or one way) to obtain the required physical and chemical properties.

Mylar sheethas excellent mechanical properties such as high strength, hardness and toughness, as well as good optical properties such as high transparency, glossiness and low fog. In addition, it has excellent chemical stability, oil resistance, corrosion resistance and excellent electrical insulation. These characteristics makeMylar sheetwidely used in packaging, printing, electronics, architecture,automobiles and other fields.

What are the classifications ofMylar sheet?

1.Type of Material

• Basic Mylar (pure PET):

terephthalic acid (PTA) is polymerized with ethylene glycol (EG) without any comonomer. High transparency (>90%), rigidity and resistance to chemical corrosion.

• Co Modified Mylar：

PETG (ethylene glycol+CHDM): Low glass transition temperature (~50 ° C), good flexibility, good impact resistance.

APET: High temperature resistance (melting point>300 ° C), excellent dimensional stability.

• Functional Mylar：Special functions by coating, composites or nanomodifications

Conductive type: Copper /aluminum layer plating (for electromagnetic shielding).

Barrier type: Multi layer co extrusion (e.g. PET/PA/PE) enhances oxygen/water vapor barrier properties.
Antistatic type: coated with carbon powder or conductive polymer.

2.Processing technology

Process type	peculiarity	Typical thickness
Uniaxial stretch film	Stretching only in one direction results in poor thickness uniformity and is mainly used for coil materials.	10–200 μm
Biaxial stretch film	Stretching in both longitudinal and transverse directions, with balanced mechanical properties and higher transparency.	10–100 μm
Multi-layer composite film	Composite multi-layer structures(such as PET/TPU/PET) through co extrusion or coating processes to enhance overall performance.	50–300 μm
Microporous membrane	Micro scale pores are formed through laser drilling or chemical etching for filtering or breathable materials.	20–50 μm

3.Thickness and specifications

Thickness range	Typical use	Processing method
Ultra thin (<10 μ m)	Flexible display screen, electronic tag.	Biaxial stretching, microporous forming.
Conventional type (10-50 μ m)	Packaging film, insulation layer.	Packaging film, insulation layer.
Thick type (>50 μ m)	Industrial buffer pads, building film materials.	Uniaxial stretching, hot pressing composite.

4.By Environmental Attributes

• Fossil based Mylar: A traditional PET material that relies on petrochemical resources is non-degradable.
• Biobased Mylar: PLA/PHA blend film,partially biodegradable(6-18 months under compost conditions). Recycled PET (rPET) is made by recycling plastic bottles and can reduce carbon emissions by more than 30%.

How is Mylar sheet used for packaging fast-moving consumer goods?

1.Material selection

• PETG: Flexible and impact resistance, suitable for printing complex shapes such as thin-walled containers and hollow structures.
• Food-grade PET: FDA-certified, heat-resistant (>120 ° C), with direct access to food.

2.Process Technology Flow

FDM PrintedMylar sheet packaging container

• Styling Design: Design container structures (such as groove, clasp, seal) using relevant software.
• Printing parameters：

Temperature: 220-260 ° C (PETG melting temperature range).

Speed: 0.1-0.3 mm/s (balance printing accuracy and efficiency).

Floor height: 0.1-0.2 mm (balance surface roughness and productivity).

• Printing and reprocessing

Support structure: Ultra thinPETGfilm (≤ 200 μ m thickness) were used to reduce the difficulty of post-cleaning.

Surface treatment: Corona treatment (to improve heat sealing adhesion) or UV curing coating (to improve weather resistance).

Heat sealing technology Realizes Seal Packaging

• Material preparation: Pack food inFDM printedcontainers and cover with a PETG film (or aluminum foil composite film).
• Heat sealing parameters：

Temperature: 150-260 ° C (adjusted for membrane type, such as PETG ≥ 200 ° C required).

Pressure: 0.5-3 bar, duration: 1-5 seconds.

• Verify seal:Airtightness test: test by water immersion method or air pressure.

3.Application scenarios

• Food packaging molds: FDM-printed molds, either conventional or custom-shaped, are removed and can be heated directly to seal the packaging.
• Disposable tableware: Printed withPETG+PLA mixed material, with a a smooth and burr free surface that meets sustainability requirements.

Through FDM printing and heat sealing technology, Mylar sheet have strong flexibility and cost advantages in the packaging of fast consumer goods, especially for small batch and high value added products.LS Teamwould like to provide enterprises from the selection of materials to mass production of one-stop service, to help enterprises preempt market!

How is Mylar sheet applied in the field of electronics?

1.Applicable materials

• PETG: Flexible, impact resistance, suitable for moisture resistant layers with complex structures.
• Modified PET: nano silica (SiO2) was added to improve moisture resistance (WVP<2000 g/m2 .24h).

2.SLS Printing Process

• Powder options:Mylar sheet powder (particle size 15-45 μ m) requires good fluidity and low water absorption.
  
• Equipment: Industrial-gradeSLS printers(such as EOS Formiga P series) equipped with nitrogen protection chambers (to prevent oxidation).
  
• parameter optimization;

Laser power: 100-150W

Scanning speed: 1000-2000 mm/s

Layer thickness: 0.05-0.1mm

Nitrogen flow rate: 10-30L/min

• Post-treatment technology

Thermal curing: Heat at 60-80 ° C for 30 minutes to remove internal pores.

Surface coating: Spray polyurethane (PU) or fluorine rubber (FKM) coating for further moisture resistance.

3.Application scenarios

• Automotive electronics: ECU control board in engine compartment (can withstand heat, vibration and humidity).

• Soft Pack Battery: PrintingMylar sheeton the surface of aluminum plastic film a secondary separator to prevent electrolyte leakage.

LSprovidesSLS printingservices and can be customized to your design. It supports small batch production and mass production and follows up adequately to meet your production needs.

How is Mylar sheet applied in the construction industry?

1.ficient building materials (Low-E glass film):

energy consumption in indoor air is reduced by reflecting far-infrared radiation (>90%) through metal coatings (e.g. silver, aluminum) or nanoceramic coatings. Insulation is 50% better than regular glass. The light light transmittance remains above 70% and does not affect indoor lighting.

2.Roof waterproofing and photovoltaic integration:

• Waterproof membrane: Modified polyurethane coating with tear resistance strength>50 N/mm for waterproof layer at the top of slope.
  
• Building Integrated Photovoltaics (BIPV): Mylar sheet is the underlying material of photovoltaic module backboards and is UV resistant (>99% light transmittance) and high temperature resistant (long-term use temperature -40 ° C~85 ° C).
  

3.Architectural decorative film:

• Explosion proof and privacy protection: laminated glass The interlayer film (such as PET based PVB film) are highly impact resistance (able to withstand 3kg steel balls).
• Artistic facade: The electrochromic PET film adjusts transparency through electric field to achieve dynamic visual effect of building facade.

4.Soil reinforcement and ecological slope protection:

• Geotechnical films: High density polyethylene (HDPE)/PET composite film are used for the anti-seepage layer in landfill sites and are more than 200 N piercing resistant.
• Ecological slope protection:Degradable PET fiber mesh(3D grid structure) anchors soil and reduces soil erosion.

What are the benefits of using Mylar for solar applications?

1. Good Weather resistance and long service life

• Anti-UV/anti-aging: Add ultraviolet absorber (e.g. UV-329) and light stabilizer (HALS) and you have an outdoor service life of more than 25 years, which is significantly better than conventional polyethylene.
• Wide-range temperature tolerance: -40 ° C~120 ° C, suitable for high desert temperatures and cold polar environments.

2.Lightweight and easy to process

• Weight loss: Density is only 1.38g/cm3, about a quarter of that of glass, reducing the transport and installation costs of photovoltaic components.
• Flexible compatibility: Flexible processing for curved photovoltaic panels such asautomotiveand integrated building roofs.

3.High transmittance and low attenuation

• Transmittance>90%: Reduce photoloss and improve photovoltaic cell efficiency.
• Anti yellowing performance: After 10 years of outdoor exposure, the transmittance attenuation is less than 5% (normal PET films can attenuate more than 20%).

4.Economy and environmental friendliness

• Low-cost: Materials cost only a tenth of what glass does, reducing the cost of making photovoltaic components.
• Recyclability: 100% regeneration and 30% to 50% reduction in carbon emissions throughchemical recycling(e.g. Eastman Molecular Cracking).

How can the reflective properties of Mylar sheet promote its use in emergency situations?

• Insulation

Mylar sheet reflects most of the heat. In cold conditions, Mylar sheet effectively reflects heat emitted by the body, reducing heat loss and creating a heat cycle inside the membrane to keep the body warm. This insulation effect is especially important in emergency situations such as outdoor rescues, mountain climbing and expeditions to help people withstand the cold, maintain body temperature and save lives.

• Reflective Signs

The surface of Mylar sheet is highly reflective and can be easily detected at night or in low visibility. This reflective feature allows Mylar sheet to act as a reflection marker in emergency situations, providing clear instructions for rescue personnel to quickly locate a trapped person or target.

• Durability

Mylar sheet material is durable and can withstand some strain and wear. This property enables Mylar sheet to maintain its integrity and functionality in emergency situations, without failure due to external forces.

• Gas and odor barrier properties

Mylar sheet also has excellent gas and odour barrier properties, can effectively prevent harmful gas and odour from entering from the outside, and provides a relatively safe and comfortable breathing environment for trapped people.

Why choose LS?

• Integrated range of services:serves theautomotive,medical device,consumer electronics,aerospace,industrial equipmentand other industries, from prototypes to mass production needs.
• Excellent quality control:We are ISO 9001 certification to ensure consistent quality and reliability.
• One-stop shop:After you submit your design documents, experts will help you choose the most appropriate materials,send you a quotation within 24 hours, and ship it according to your needs within an agreed time.

Summary

Polyester film has become an indispensable material in global industry and daily life. The main applications of polyester film are summarized in this paper. In the packaging industry, polyester film with its high transparency, excellent barrier properties, printing adaptability, etc., has become an ideal choice for food, medicine, industrial packaging. Due to its excellent insulation performance and heat resistance, polyester film are widely used in electrical and electronic engineering for capacitors, insulation materials, cables and so on. In addition, polyester film also play an important role in optical display, building materials, healthcare, new energy and other industries, becoming an indispensable material for modern industry.

Disclaimer

The content on this page is for reference only.LSdoes not make any express or implied representation or warranty as to the accuracy, completeness or validity of the information. No performance parameters, geometric tolerances, specific design features, material quality and type or workmanship should be inferred as to what a third party supplier or manufacturer will deliver through the Longsheng Network. It is the responsibility of the buyerseeking a quote for partsto determine the specific requirements for those parts. Pleasecontact usfor moreinformation.

LS Team

LS is an industry-leading companyspecializing in custom manufacturing solutions. With over 20 years of experience serving more than 5,000 clients, we focus on high-precisionCNC machining,sheet metal fabrication,3D printing,injection molding,metal stamping, and other one-stop manufacturing services.
Our factory is equipped with more than 100 advanced 5-axis machining centers and is ISO 9001:2015 certified. We provide fast, efficient, and high-quality manufacturing solutions to customers in over 150 countries worldwide. Whether it’s low-volume production or large-scale customization, we can meet your needs with delivery as fast as 24 hours. ChoosingLS Technologymeans choosing efficiency, quality, and professionalism.
To learn more, please visit our website:www.lsrpf.com

FAQs

1.What are the techniques for using Mylar sheet paper?

It should be placed in a dry, cool, airy place to avoid direct sunlight, rain and high temperature fumigation. Choose appropriate tool and cutter to cut to ensure a clean cut. Double-sided adhesive tape can be used for fixation to avoid overstretching and cracking. Try not to fold. If folding is required, place on a flat surface to avoid wrinkles.

2.How is Mylar used in arts and crafts?

Due to its high transparency and good glossiness, artists use Mylar sheet to create safety signs or decorative designs for reflective processes. Not only These handicrafts beautiful, but they also have remarkable durability, ease of handling and the ability to retain bright colors, making polyester a favorite material choice for artists.

3.How does Mylar function in balloons?

Mylar sheet has high strength and toughness, which makes the balloon not easy to burst. It has a high gloss and can be made into balloons of different colors and shapes, providing better visuals and meeting diverse needs. As the outer protective layer of the balloon, it protects the balloon from ultraviolet light and ozone damaging the balloon sphere, thus extending its lifespan.

4.What are the advantages of using Mylar sheet in outdoor emergency situations?

Mylar sheet material lightweight, easy to carry, do not increase the burden of outdoor activities, and facilitate rapid deployment and use in emergency situations. It reduces body heat loss, provides insulation effect and helps people stay body temperature in cold conditions. It also has good water and windproof performance to keep you dry in harsh outdoor environments. Its reflective properties can quickly detect trapped people at night.

Resource

Space blanket

Polyethylene terephthalate

Mylar balloon (geometry)