China pet film production companies, polyester film manufacturer-Yuxing Film

UV/Hydrolysis Resistan Film

CY25HTGU Transparent Weather-Resistant BOPET Polyester Film

A transparent weather-resistant BOPET polyester film with hydrolysis resistance, UV resistance, good dimensional stability, and electrical insulation, mainly used in double-sided solar cell backsheets and other weather-resistant products.

PET base film

Solar backsheet

Weather resistance

Electrical insulation

Product Model:

CY25HTGU

Key Highlights

Hydrolysis resistance

PCT 48-hour test ensures excellent resistance to moisture and heat.

UV resistance

UV blocking rate (93-95%) and low yellowing ensure long-term outdoor durability.

Good dimensional stability

Low shrinkage at 150°C ensures consistent dimensions during processing and use.

Technology & Advantages

Standard PET films may experience reduced mechanical performance, embrittlement, cracking, or reduced insulation reliability under high-temperature, high-humidity, and long-term outdoor exposure conditions. In addition to hydrolysis resistance, CY25HTGU also offers enhanced UV resistance.

Core Values

Long-term reliability:
Helps backsheet structures withstand damp heat, UV exposure, temperature variation, and long-term outdoor service. Passed PCT 48-hour test and UV resistance test, ensuring proven durability for double-sided solar cell backsheets in harsh environmental conditions.

Processing compatibility:
Suitable for common lamination processes and adhesive systems used in mass production of backsheet materials. Stable dimensional and surface properties support consistent coating, lamination, and converting operations for reliable manufacturing quality.

Electrical safety:
Provides stable electrical insulation support for the protective function of photovoltaic backsheets. High electrical strength and volume resistivity ensure reliable anti-leakage and breakdown protection for solar module safety in outdoor environments.

Applications

Floating PV

High humidity and water vapor environments require stronger hydrolysis resistance.

Desert PV

High UV exposure and temperature variation require thermal and dimensional stability.

Rooftop PV

Long-term outdoor operation requires stable insulation safety and structural reliability.

Utility-Scale PV Plants

Suitable for module projects requiring consistency, stable supply, and long-term material performance.

Technical Specifications

Properties	Unit	Standard	Typical Value
Thickness	μm	GB/T 13542.2-2021	50 / 75 / 125 / 275 / 300
MD	MPa	GB/T 13542.2-2021	140 / 140 / 140 / 170 / 170
TD	MPa	GB/T 13542.2-2021	150 / 150 / 150 / 170 / 170
MD	%	GB/T 13542.2-2021	130 / 130 / 130 / 140 / 140
TD	%	GB/T 13542.2-2021	90 / 100 / 110 / 110 / 110
@150°C, 30min - MD	%	GB/T 13542.2-2021	1.0 / 1.0 / 1.0 / 0.7 / 0.7
@150°C, 30min - TD	%	GB/T 13542.2-2021	0 / 0 / 0 / 0 / 0
Transmittance	%	ASTM D1003	87 / 87 / 87 / 86 / 86
UV Blocking Rate (280-380nm)	%	UV-vis spectrophotometry	93 / 94 / 95 / 95 / 95
PCT - MD	%	121°C, 100%RH, 2atm, 48h	40
PCT - TD	%	121°C, 100%RH, 2atm, 48h	50
UV Test △b	-	CQC 3308-2013, 150kwh/m2	5.0

Remark: Parameters above are from the TDS. MD refers to machine direction and TD refers to transverse direction; where the TDS specifies type inspection or delivery inspection items, the original TDS shall prevail.

Packaging & Logistics

Storage Conditions

Store the product in a clean, dry, and ventilated place.

Storage Environment

Keep away from fire, heating sources, and direct sunlight.

Pallet

Fumigation-free wooden pallets suitable for export transportation.

Label Information

Each roll label includes model, batch number, thickness, width, net weight, and production date for traceability.

Slitting Range

Different slit widths can be supplied according to customer laminating equipment and production requirements.

Supply Note

Regular specifications support batch supply. Lead time depends on order specifications, quantity, and production schedule.

Frequently Asked Questions

Q: What is CY25HTGU mainly used for?

A: It is mainly used in solar cell backsheet applications.

Q: What are the main features of CY25HTGU?

A: hydrolysis resistance, UV resistance, good dimensional stability, and electrical insulation, mainly used in double-sided solar cell backsheets and other weather-resistant products.

Q: Can other thicknesses be customized?

A: Yes. Other thicknesses can be customized according to the customer's specific requirements.

Q: Can samples be provided for testing?

A: Yes, samples or small rolls can be provided according to project requirements for lamination, laminating and performance validation tests.

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