Embracing Sustainability Our R&D in Eco-Friendly, PFAS-Free Cable Materials

OEM requirement	What should be evaluated
PFAS-related material requirement	Which substances are restricted and what documentation is required
Electrical performance	Dielectric properties, capacitance, impedance and insulation
Cable OD	Insulation thickness and overall dimensional limits
Flexibility	Material hardness, thickness and cable construction
Temperature	Continuous and peak operating conditions
Chemical exposure	Cleaning agents, solvents and other chemicals
Mechanical durability	Abrasion, bending and fatigue
High-frequency performance	Dielectric behavior and signal-loss requirements
Manufacturing	Extrusion, processing and termination compatibility
Compliance documentation	Material declarations, specifications and test evidence

Material Type	Advantages	Limitations	Typical Applications
PFAS-Based Fluoropolymer Materials	Excellent chemical resistance, high temperature stability, low friction and reliable electrical performance	Environmental concerns and increasing regulatory pressure	Aerospace, medical devices, high-performance electronics
PFAS-Free Alternative Materials	Reduced environmental impact, improved sustainability compliance and future regulatory adaptability	Requires continuous R&D to achieve equivalent thermal and electrical performance	Sustainable electronics, medical equipment, consumer electronics
Silicone Materials	Excellent flexibility, temperature resistance and biocompatibility	Lower mechanical strength compared with some fluoropolymers	Medical cables, wearable devices, flexible cable assemblies
TPE / TPU Materials	Lightweight, flexible and recyclable potential	Performance varies depending on formulation	Consumer electronics, industrial cable assemblies

Engineering Selection and OEM Considerations

1. PFAS-Free Should Be Defined as a Specific Material Requirement

“PFAS-free cable” can be too broad for an engineering drawing.

Before selecting materials, OEMs should define:

Which substances or material families are restricted
Whether the requirement applies to insulation only or the complete assembly
Whether connectors, adhesives, jackets and overmolds are included
What supplier documentation is required
Whether third-party testing is required

If the PFAS-related requirement applies to the complete cable assembly, then all relevant materials and components should be reviewed, because the insulation is only one part of the finished product.

2. Insulation Material Must Still Meet Electrical Requirements

Cable insulation is part of the electrical structure, especially in fine wire and micro coaxial cable.

Important parameters include:

Electrical factor	Why it matters
Dielectric constant	Influences capacitance and transmission characteristics
Dissipation / dielectric loss	Can affect high-frequency attenuation
Insulation resistance	Supports electrical isolation
Breakdown strength	Relevant to dielectric withstand
Thickness uniformity	Helps maintain consistent cable geometry
Surface quality	Affects processing and downstream termination

If the cable carries high-speed or RF signals, then the replacement insulation should be evaluated for its dielectric characteristics as part of the complete cable design, because changing insulation can change capacitance, impedance and signal behavior.

For related high-frequency applications, see Micro Coaxial Cable and RF Coaxial Cable Assembly.

3. PFAS-Free and Miniaturization Can Create a Design Trade-Off

Ultra-fine electronic wire and micro coaxial cable often require extremely thin insulation layers.

The material therefore needs to provide the required electrical and mechanical performance within a small dimensional envelope.

If the OEM requires both PFAS-free insulation and very small cable OD, then insulation thickness, dielectric properties, extrusion stability and mechanical performance should be evaluated together, because changing the insulation material can affect the complete cable geometry.

This is especially important for:

40AWG / 42AWG / 44AWG fine wire
Micro coaxial cable
High-density medical cables
Camera assemblies
UAV and robotics cable assemblies

4. Flexibility Must Be Evaluated After Material Changes

Different insulation materials can behave differently during repeated bending.

Relevant characteristics include:

Hardness
Elongation
Flexural behavior
Fatigue resistance
Friction
Adhesion
Temperature dependence

If a cable is used in a dynamic application, then a PFAS-free insulation change should be validated under representative flex conditions, because a material that works electrically may still change the cable's bending behavior or flex life.

For flexible applications, see Ultrasound Probe Cable and UAV & Robotics.

5. Temperature Resistance Cannot Be Evaluated in Isolation

Some traditional high-performance fluoropolymer systems are selected specifically because of their thermal and electrical properties.

When evaluating a PFAS-free alternative, OEM engineers should compare:

continuous temperature + peak temperature + thermal cycling + mechanical performance at temperature

If the cable operates near its material limits, then the PFAS-free alternative should be evaluated under the actual thermal profile, because room-temperature test results do not demonstrate long-term performance at elevated temperatures.

6. Chemical Resistance Is an Application-Specific Requirement

One reason certain high-performance cable materials are used in demanding environments is their resistance to chemicals.

A PFAS-free alternative should therefore be evaluated against the actual exposure conditions:

Exposure	What to evaluate
Cleaning agents	Surface and material compatibility
Disinfectants	Long-term chemical stability
Solvents	Swelling / cracking / degradation
Oils	Surface and insulation resistance
Moisture	Water resistance and aging
Sterilization	Process-specific compatibility

If the cable will be exposed to cleaning chemicals or sterilization, then the actual chemical/process conditions should be included in material qualification, because general chemical-resistance claims do not establish compatibility with every application.

7. Sustainable Material Selection Should Not Ignore Cable Performance

A lower-impact material is useful only if the finished cable still performs as required.

OEM material selection should balance:

sustainability requirement ↔ electrical performance ↔ mechanical performance ↔ manufacturing capability ↔ service life

If a PFAS-free material meets the sustainability requirement but requires substantially greater thickness or reduces flex life, then the complete cable design should be reviewed before approval, because a material change can shift the performance of the entire assembly.

8. Manufacturing Process Compatibility Is a Key Qualification Point

A material may have suitable laboratory properties but still be difficult to process consistently into ultra-fine cable.

Important manufacturing considerations include:

Extrusion temperature
Melt behavior
Die design
Line speed
Insulation thickness
Concentricity
Surface quality
Cooling conditions
Stripping performance
Termination compatibility

If the cable uses ultra-fine conductors, then the insulation material should be qualified together with the production process, because small dimensional variations become more significant as the cable size decreases.

This is particularly relevant to HOTTEN's fine-wire and micro coaxial manufacturing.

9. PFAS-Free Insulation Can Affect Cable OD

For high-density cable assemblies, a small change in insulation thickness can have a significant effect on the final dimensions.

The resulting chain is:

material → insulation thickness → cable OD → routing space → connector integration

If the device has a tightly constrained mechanical envelope, then the PFAS-free insulation should be evaluated against the maximum allowable cable OD, because the material change should not create an assembly that no longer fits the device.

10. High-Frequency Applications Need a Dielectric Comparison

For micro coaxial and RF cable applications, a material change should be assessed using actual electrical parameters rather than environmental claims alone.

OEM engineers can compare:

Parameter	Material-selection question
Dielectric constant	Does it meet the required cable design?
Dielectric loss	Is attenuation within the system budget?
Capacitance	Does the cable maintain the required electrical loading?
Impedance	Can the target impedance be maintained?
Temperature stability	Do properties remain stable over the operating range?
Processing	Can the required cable geometry be manufactured consistently?

If the cable operates at high frequency, then dielectric properties should be validated on the finished cable construction, because the material's nominal datasheet values do not by themselves define the performance of the final miniature coaxial structure.

11. Medical Applications Require Additional Material Review

For medical cable assemblies, material selection may be affected by:

Patient contact
Cleaning and disinfection
Sterilization
Long-term flexibility
Chemical exposure
Device-specific biological evaluation

If the finished cable can contact the patient or body, then the OEM should assess the material configuration within the applicable medical-device biological evaluation process, because a material being PFAS-free does not automatically establish its biological suitability.

For medical applications, see Medical Cable Assembly.

12. The Complete Cable Assembly Should Be Evaluated

A PFAS-related material change may affect more than the wire insulation.

The complete assembly can contain:

conductor + insulation + dielectric + shield + jacket + adhesive + connector + strain relief + overmold

If an OEM wants a PFAS-free finished assembly, then the material review should cover all applicable components, because the final product may contain several different polymeric or processed materials.

13. Documentation Is Part of OEM Material Qualification

For OEM purchasing, the supplier should be able to identify the material construction clearly.

Useful documentation may include:

Documentation	Purpose
Material specification	Defines the approved material
Supplier declaration	Documents material information
Technical datasheet	Provides electrical / thermal / mechanical data
Test report	Supports specific qualification requirements
BOM	Identifies materials and components
Engineering drawing	Defines approved cable construction
Change-control records	Controls later material changes
Traceability	Supports production investigation

If PFAS-free status is a formal customer requirement, then the exact scope and evidence should be agreed during the RFQ stage, because “PFAS-free” can otherwise be interpreted differently by different suppliers.

14. OEM RFQ Requirements for PFAS-Free Cable

A practical RFQ should specify:

RFQ item	Recommended information
PFAS requirement	Restricted substances / defined scope
Application	Medical, RF, camera, UAV, robotics, etc.
Conductor	AWG and material
Insulation	Required material / approved alternatives
Cable OD	Maximum allowable diameter
Frequency	Operating range where relevant
Capacitance	Target / maximum where applicable
Impedance	Required value where applicable
Flexibility	Bend radius and cycle requirements
Temperature	Operating and processing range
Chemical exposure	Cleaning / disinfectant / solvent conditions
Sterilization	Method and cycle requirements where applicable
Shielding	Required construction
Connector	Manufacturer / part number
Testing	Electrical / mechanical / environmental tests
Documentation	Material declarations and test evidence
Quantity	Prototype / pilot / mass production

If the OEM has not finalized the insulation material, then the RFQ can specify the required performance envelope and PFAS-related restrictions, because the cable manufacturer can evaluate suitable material options before the construction is locked.

15. Material Selection Should Follow the Actual Device Requirement

A useful selection process is:

Define restriction → Define electrical requirements → Define mechanical requirements → Define environmental conditions → Compare materials → Prototype → Validate → Approve → Control production

This avoids treating PFAS-free as an isolated purchasing specification.

If a PFAS-free material satisfies the environmental requirement while maintaining the necessary electrical, mechanical and manufacturing performance, then it can become part of the approved cable construction, because the material has been selected against the complete engineering requirement rather than a single attribute.

For HOTTEN's fine-wire and custom cable projects, see Thin Electronic Wire, Micro Coaxial Cable, and Micro Coaxial Cable Assembly.