FAQ- Fluorinar™ Kynar® Filament

Fluorinar™ Kynar® Filament
 

What diameter and color options are available in the Fluorinar™ PVDF filaments?

Fluorinar-C™ 1.75mm & 2.85 mm (white)
Fluorinar-B™ 1.75mm & 2.85 mm (black)
Fluorinar-ESD™ 1.75mm & 2.85 mm (black)
Fluorinar-H™ 1.75mm & 2.85 mm (natural)


What are the differences between the four Fluorinar™ PVDF filaments?

PVDF is commonly used throughout industry (semicon, biopharm, nuclear, chemical process) in the homopolymer form. This corresponds to our Fluorinar-H™ material. PVDF has two fluorine and two hydrogen atoms in each repeat unit. It can be thought of as the offspring of PTFE (4 fluorine atoms and PE (4 hydrogen atoms). Unlike PTFE, PVDF is fully melt-processible. The high crystallinity of PVDF makes adhesion to the build plate difficult. There is a change in the volume of semicrystalline plastics such as PVDF during the transition from the amorphous melt phase to the semicrystalline solid. This creates surface stress between the print and the build plate. This stress can be managed through careful part design (no sharp corners, fillet transitions from the bottom to the side, use of adhesive, etc.) OUr Fluorinar-H™ filament represents this 50+ year legacy.

The Fluorinar-C™ material is the PVDF copolymer. It is polymerized with the VDF monomer and hexafluoropropylene (HFP) monomer. 100% HFP is a fluoroelastomer known by the DuPont tradename Viton®. Some Fluorinar-C™ has increased flexibility, slightly lower crystallinity and melting temperatures and slightly different chemical resistance. But one advantage is increased build plate adhesion.

The Fluorinar-B™ is our PVDF copolymer with additional pigmentation. The pigment helps minimize the surface stress against the build plate. The adhesion of the printed part is so good, we rarely use extra brims during printing. It is not uncommon to break off layers of glass from the build plate during part removal if we have not allowed for sufficient cooling time.

The Fluorinar-ESD™ filament has a graphene additive which transforms the printed parts from an electron insulator to a low-end conductor which resistance equivalence of graphite. Not a great conductor but very good at static dissipation. This is an important quality in many electronic and chemical manufacturing processes.

Botton line is that all four filaments address very specific needs. However, if you are new to PVDF we would recommend either the Fluorinar-C or Fluorinar-B filaments.


What print parameters should I use for a successful print?

1. Print on a glass bed heated to 100 C.
2. Use a light layer of Elmer’s disappearing purple glue on the glass for adhesion. Other PVA adhesives have not been as effective.
3. Print with a single layer 10 – 15 mm brim attached to the part.  This is not required for Fluorinar-C™
4. Maximize part surface area in contact with the print bed.
5. Set extrusion temperature 250 – 260 C.
7. Layer height can be 0.1 – 0.2 mm.
8. Print speed should be around 20 – 40 mm/s.
9. If the part is small it will help to print in duplicate as the most recent layer on the first part is allowed to cool while the layer on the second part is printing.
10. Fluorinar-H™ likes to run hot. We never use a fan with this material.  When using Fluorinar-C™ for larger prints, a fan can be used to increase print speed up to 70 mm/s.  Keep an eye on things.  If interlayer bonding does not appear to be working then the fan or print speed can be reduced. When printing 3DBenchy with Fluorinar-C™ we run the fan up to 50% in order to get the rod holder and smokestack features nice and round.

Additional printing guidance can be found here.


How much shrinkage can I expect to see when using Fluorinar™ filaments?

To determine the amount of shrinkage in a printed part we printed examples of the 20 mm XYZ calibration cube. This STL file is available from Thingiverse.
 
Filament: Fluorinar-C™
Layer Height: 0.2 mm
Infill: 30%
X-axis = 19.80 mm (1.00%)
Y-axis = 19.87 mm (0.65%)
Z-axis = 19.65 mm (1.75%)
 
Filament: Fluorinar-B™
Layer Height: 0.2 mm
Infill: 30%
X-axis = 19.82 mm (0.90%)
Y-axis = 19.98 mm (0.10%)
Z-axis = 19.91 mm (0.45%)


What length of filament is on the spool?

Our 1.75 mm Fluorinar™ filaments have approximately 785 feet (239 m) while our 2.85 mm Fluorinar™ filaments have 300 feet (91 meters) on each spool.


How soon will my order ship?

All of our Fluorinar™ filaments are off-the-shelf items that will ship within 24 hours of order placement. If we can’t meet this deadline we will contact you with a revised shipment date.