PVDF Kynar Sheet & Rod Specifications and Stock Sizes

PVDF / Kynar stock shapes — sheet and rod — are produced from homopolymer PVDF resin to ASTM standards covering dimensional tolerances, material testing, and physical properties. Understanding the available sizes, dimensional tolerances, and relevant standards helps engineers specify correctly and avoid surprises at the fab shop. This page documents standard stocked sizes, tolerance bands, material standards, and ordering considerations for natural (off-white) PVDF sheet and rod.

At a Glance

• Sheet: standard 4′ × 8′ format; thicknesses from 1/8″ to 2″+ stocked
• Rod: diameters from 1/4″ to 4″; cut-to-length from 4′ or 6′ stock
• Color: natural (off-white) — PVDF is not pigmented to other colors in standard stock
• ASTM D3222 covers PVDF resin specification; shapes follow standard plastics tolerances
• Density 1.78 g/cc — PVDF is denser than PP, PVC, or PTFE (2.2 g/cc for PTFE)
• Cut-to-size service available; minimum cutting charges apply on small pieces
• Non-standard thicknesses (e.g., 5/8″, 7/8″) may require minimum order quantities

PVDF Sheet Specifications

Standard Sheet Format

PVDF sheet is supplied in the industry-standard 4′ × 8′ (48″ × 96″) format. This sheet size is compatible with standard CNC router tables and planer saws used for plastic fabrication. The 4 × 8 format allows efficient nesting of most tank-panel and wet-bench-component cut patterns.

Standard Stocked Thicknesses

Weights are approximate based on density 1.78 g/cc. Actual weights will vary slightly by lot.

Sheet Thickness Tolerances

Standard machined or extruded PVDF sheet is held to the following thickness tolerances per industry norms:

Planarity (flatness) of PVDF sheet can vary, particularly in thinner gauges. If flatness is critical for your application, request a flatness specification when ordering, or plan to machine one face flat as a datum.

Selecting Sheet Thickness

Common thickness selections by application:

• 1/8″ – 3/16″: Light guards, splash panels, non-structural liners
• 1/4″ – 3/8″: Standard wet-bench construction, small tank walls, structural panels
• 1/2″ – 3/4″: Medium tank walls, pump bases, structural manifold bodies
• 1″ – 2″: Heavy-wall tanks, valve-body blanks, thick slab machining stock

PVDF Rod Specifications

Standard Stocked Diameters

PVDF rod is extruded and stocked in the following standard diameters, cut from 4′ or 6′ straight lengths:

Larger diameters (5″, 6″) may be available as slab or machined blanks on inquiry with lead time.

Rod Diameter Tolerances

Standard PVDF rod is held to the following OD tolerances:

Rod is extruded with a slight positive tolerance (oversize) to allow machining to net dimension. Straightness tolerance is generally 0.060″ per 48″ of length; check straightness on long rods before setting up in a lathe.

Rod Selection by Application

• 1/4″ – 1/2″: Small valve stems, spacers, standoffs
• 3/4″ – 1-1/2″: Valve bodies (machined), nozzle blanks, impeller stock
• 2″ – 3″: Pump housings, large valve bodies, manifold blocks
• 4″: Large block machining, flanges, thick-section components

Material Standards

ASTM D3222

ASTM D3222 ("Standard Specification for Unmodified Poly(Vinylidene Fluoride) (PVDF) Molding Extrusion, and Coating Materials") is the primary resin standard for PVDF. It classifies PVDF resins by type (homopolymer, copolymer), melt-flow index, and property values. Stock shapes produced from PVDF homopolymer meeting D3222 meet the baseline resin quality expectation.

ASTM D638 and D790 (Mechanical Testing)

Tensile properties (ASTM D638) and flexural properties (ASTM D790) are the standard test methods referenced for PVDF mechanical data. Published property values of 7,000 psi tensile strength and 290,000 psi flexural modulus are derived from these test methods on injection-molded specimens; extruded shapes may show slight directional variation.

SEMI Standards (Semiconductor Applications)

For semiconductor-grade PVDF (Kynar 740), SEMI standards govern material cleanliness and extractables. If your application requires SEMI compliance, request the specific standard number and lot certification from your materials supplier at the time of order.

Ordering Considerations

Cut-to-Size vs. Full Sheet/Rod

PVDF is available as full 4 × 8 sheets, cut-to-size pieces, or rod cut to specified lengths. Cut-to-size pieces minimize waste for small jobs but typically carry a saw-cutting charge per cut. For large fabrication runs, ordering full sheets and cutting in-house is more economical.

Kerf and Cutting Allowance

PVDF saw cuts typically have a 1/8″ kerf. When nesting multiple parts from a sheet, add this kerf allowance to your cut plan to avoid undersized pieces.

Color and Availability

Standard PVDF stock shapes are natural (off-white) only. Unlike some engineering plastics that are routinely stocked in multiple colors, PVDF is not practically pigmented in standard stock — custom-colored PVDF generally requires a minimum-order direct from the compounder. If color coding is required in your fabricated assembly, consider using color-coded labels or secondary identification rather than specifying colored PVDF.

Weight Reference for Shipping

At 1.78 g/cc, PVDF is notably heavier than polypropylene (0.91 g/cc) or HDPE (0.95 g/cc) and slightly lighter than PTFE (2.2 g/cc). Factor density into shipping cost estimates when ordering large-format sheets or bulk rod.

For fabrication details including machining and welding guidance, see PVDF machining and welding. For grade selection by application, see the PVDF grades comparison.

Request a Quote on PVDF Stock Shapes

Specify your required form (sheet or rod), thickness or diameter, length, grade, and quantity. Standard PVDF ships from stock; non-standard sizes and Kynar 740 certification may require short lead time.

Related Guides

More related guides

Cross-cluster suggestions to help shoppers and engineers explore adjacent topics:

Applications

• Manifolds
• Chemical Tanks
• Food Zone Fda

Industries

• Medical
• Semiconductor

Compare to other materials

• Pvc Vs. Pvdf
• Pvdf Vs. Ptfe
• Polypropylene Vs. Pvdf

Frequently asked questions — Pvdf Kynar FAQ