Kynar Flex PVDF | Flexible and Impact-Resistant Machined Components
Kynar Flex is a modified PVDF supplied as extruded rods and plates. Designed for machined parts that require flexibility, improved impact resistance, and chemical resistance in demanding environments.
What Kynar Flex offers
Performance characteristics that make Kynar Flex the preferred choice where flexibility and impact resistance are priorities alongside chemical compatibility.
Higher stiffness and rigidity
Glass fiber reinforcement significantly increases stiffness, making PEEK GF30 well-suited for structural components that must resist bending and deflection.
Improved dimensional stability
Lower thermal expansion and reduced creep enable machined parts to maintain tight tolerances under mechanical load and temperature variation.
Strong mechanical performance under load
Provides higher tensile and flexural strength compared to unfilled PEEK, supporting demanding load-bearing applications.
Better performance for thin-walled and precision parts
The added rigidity supports designs where thinner sections or tighter tolerances are required.
Reliable performance in harsh environments
Maintains stability in environments with heat, mechanical stress, and exposure to fuels, oils, and industrial chemicals.
Common components made from Kynar Flex
Typical machined parts that benefit from flexibility and impact resistance.
Water and Fluid Handling Components
Handles pressure fluctuations and mechanical stress in fluid systems.
Laboratory and Analytical Equipment Parts
Used where toughness and chemical compatibility are required.
Chemical Handling System Components
Provides resilience in systems exposed to aggressive fluids and movement.
Protective Housings and Guards
Used where crack resistance and durability are critical.
Impact-Resistant Pump and Valve Components
Suitable for parts exposed to vibration or mechanical shock.
Flexible Liners and Covers
Used where components must absorb impact or accommodate movement.
Kynar Flex Technical Properties
| Property | Test | Kynar Flex | Unit |
|---|---|---|---|
| Tensile Strength | ASTM D638 | 4,500 | PSI |
| Tensile Modulus | ASTM D638 | 50 | KSI |
| Elongation @ Break | ASTM D638 | 600 | % |
| Flexural Strength | ASTM D790 | N/A (highly flexible) | PSI |
| Flexural Modulus | ASTM D790 | 50 | KSI |
| Compressive Strength | ASTM D695 | N/A | PSI |
| Izod Impact (notched) | ASTM D256 | No break | ft-lb/in |
| Hardness Shore D | ASTM D2240 | 60 | — |
| Property | Test | Kynar Flex | Unit |
|---|---|---|---|
| HDT @ 264 psi | ASTM D648 | 185 | °F |
| Melting Point | — | 295 | °F |
| CLTE | ASTM E831 | 9.0 | in/in/°F × 10⁻⁵ |
| Thermal Conductivity | ASTM C177 | 1.1 | BTU·in/hr·ft²·°F |
| Property | Test | Kynar Flex | Unit |
|---|---|---|---|
| Dielectric Strength | ASTM D149 | 900 | V/mil |
| Dielectric Constant | ASTM D150 | 7.5 | — |
| Dissipation Factor | ASTM D150 | 0.060 | — |
| Surface Resistivity | ASTM D257 | 10¹² | Ω/sq |
| Volume Resistivity | ASTM D257 | 10¹² | Ω·cm |
| Property | Test | Kynar Flex | Unit |
|---|---|---|---|
| Coefficient of Friction (Dynamic) | ASTM D3702 | 0.25 | — |
| Wear Rate (K-factor) | ASTM D3702 | 110 | × 10⁻¹⁰ in³·min/ft·lb·hr |
| Property | Test | Kynar Flex | Unit |
|---|---|---|---|
| Specific Gravity | ASTM D792 | 1.75 | — |
| Water Absorption (24hr) | ASTM D570 | 0.04 | % |
| Flammability | UL94 | V-0 | — |
Kynar Flex rods, plates & tubular bars
Extruded stock shapes are supplied in standard diameters and thicknesses, with custom dimensions available for specific applications.
Rods
Extruded Kynar Flex rods are supplied for impact-resistant and flexible machined components. Rods typically available from 3/8" to 8" diameter.
Plates
Kynar Flex plates are supplied for machined covers, liners, and protective components. Plates available from 3/8" to 4" thickness.
Tubular Bars
Tubular bars are available for applications requiring flexibility with chemical resistance.
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How Kynar Flex compares to other PVDF grades
Quick reference guide to help you choose the right PVDF material for your application.
| Grade | Best For | Flexibility | Chemical Resistance | Notes |
|---|---|---|---|---|
| Kynar 740 | Rigid chemical environments | Low | Excellent | Baseline PVDF grade. |
| Kynar 1000 | Durable chemical environments | Low–moderate | Excellent | Higher toughness and crack resistance. |
| Kynar Flex | Flexible and impact-resistant parts | High | Very good | Modified for flexibility. |
Need help determining if Kynar Flex is the right choice?
Share your impact conditions, movement requirements, or chemical exposure details and our technical team will guide you on grade selection, stock formats, and supporting documentation.
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Frequently Asked Questions
Kynar Flex is a modified PVDF grade designed to provide increased flexibility and impact resistance compared to standard PVDF materials.
Choose Kynar Flex when flexibility, impact resistance, or resistance to cracking is more important than rigidity.
Yes. Kynar Flex maintains good chemical resistance, though rigid PVDF grades may offer slightly higher resistance in some conditions.
Moisture absorption is low, helping maintain dimensional stability in humid or wet environments.
Yes. It is specifically formulated to absorb impact and resist cracking under mechanical shock.
Yes. PVDF provides good electrical insulation properties.
It can be used in many chemical and industrial applications, but rigid PVDF grades are typically preferred for the highest purity requirements.
Kynar Flex is supplied as extruded rods, plates, and tubular bars in standard sizes, with custom dimensions available on request.
In some applications, yes. Kynar Flex offers greater chemical resistance and temperature capability than many elastomers, while still providing flexibility.
Kynar Flex stands out for combining flexibility with strong chemical resistance and higher temperature performance.