Transparent, heat-resistant, and low dielectric - the amorphous fluorinated polymer SF-AF series reshapes the "invisible boundary" of high-end manufacturing

In cutting-edge fields such as high-frequency communication, deep ultraviolet optics, and microfluidic chips, a material is quietly becoming a key "hero behind the scenes", due to its completely transparent, no melting point, and high stability in strong acids and bases - it is the amorphous fluorinated polymer SF-AF series.

Today, we will unveil the mysterious veil of this "special polymer" and see how it solves the "bottleneck" problem in high-end manufacturing with molecular level design.

What is the amorphous fluorinated polymer SF-AF series?
The SF-AF series is a type of fluorinated copolymer that is completely amorphous and has no obvious melting point. The hydrogen atoms in its main chain are highly replaced by fluorine atoms, forming an extremely stable C-F bond structure. This structure endows it with three core advantages:

✅  Excellent chemical stability

✅  Excellent UV resistance and chemical inertness

✅  Extremely low dielectric constant (less than 2.1)

More importantly, it does not contain harmful fluorinated surfactants such as PFOA, PFOS, GenX, etc., responding to the strict requirements of global environmental regulations from the source.

Performance benchmarking against international standards: not inferior to CYTOP, and customizable to surpass

Among similar products, Japan's AGC Corporation's CYTOP has long been regarded as the industry benchmark. The SF-AF series not only has comparable basic performance, but also has the advantage of highly customizable:

 

Performance	SF-AF	CYTOP®
Glass transition temperature Tg	105-110℃	108℃
Refractive index	1.34	1.34
Dielectric constant	<2.1	2.0–2.1
Water contact angle	110°	112°

Note: The fluctuation of this data is due to the customized differences in the physical and chemical properties required for SF-AF in different applications, rather than the instability of production batches.

The SF-AF series is not a "standard product", but a programmable molecular platform. Through molecular design, it is possible to achieve:

Customization of functional groups → Controllable functional group types (- CF3, - COOH, - CONH, and structures that can be docked with silane systems), optimizing interface adhesion or reaction activity

Molecular weight and dispersion regulation → Balancing mechanical strength and processing flowability

Solution/melt viscosity adjustment → adaptation to spin coating, pulling, spraying and other processes

Surface Energy Design → Control Wettability, Anti fouling or Biocompatibility

Solubility parameter matching → compatible with mainstream fluorocarbon solvent systems

Whether it is making optical films with a thickness of 10 microns or coating microfluidic channels at the sub-micron level, the SF-AF series can be "tailored".

 

Four major application scenarios empower cutting-edge industries

Electronics and High Frequency Communication

Used as a "window material" for 5G/6G antennas: basically transparent to microwaves, with extremely low signal distortion

High frequency circuit board dielectric layer: ultra-low dielectric constant reduces signal delay and crosstalk

Chip packaging protective coating: high temperature resistance, low moisture absorption, high insulation

Optics and Photonics 

Fiber optic cladding layer: low refractive index, improves total reflection efficiency

Deep ultraviolet (DUV) anti reflective coating: maintains high transmission at 193nm wavelength

High energy laser window: radiation resistant, colorless, low coefficient of thermal expansion

Mechanical and Chemical Engineering

Corrosion resistant observation window, connector, seal

Chemical pipeline lining, reactor coating

Microfluidic chip substrate: smooth surface, chemically inert, easy to process

Emerging technologies

Gas separation membrane

Surface modification layer of biosensor

Transparent substrates for flexible electronic devices

Why choose the SF-AF series?

We don't need another 'similar' material, we need a molecular solution that can solve specific problems.

The development logic of the SF-AF series is exactly like this - starting from application pain points, reverse designing molecular structures, and then implementing them through advanced polymerization and film forming processes. At present, SF-AF has achieved stable mass production and supports various film-forming methods such as spin coating (≤ 10 μ m) and lift off method (≤ 1 μ m).

 

Conclusion: The future of green high-performance materials has arrived

Under the dual drive of "dual carbon" and "high-end manufacturing localization", high-performance and environmentally friendly fluoropolymers such as the SF-AF series are moving from laboratories to production lines, and from import substitution to global leadership.

It may not be visible or tangible, but it is an indispensable "invisible cornerstone" for the next generation of information technology, energy technology, and life sciences.
Let materials speak for themselves and define the future through molecular innovation.

If you need sample testing, technical parameter tables, or customized development cooperation, please feel free to contact us!