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ASTM D4894 Cutting Die – Microtensile Dumbbell
Microtensile Dumbbell · Tensile specimen — built to ASTM D4894. Hardened steel or economical ribbon steel.
Brand: Universal Grip | Model: UGC-CDH-D4894 / UGC-CDR-D4894 | ● Made to order
Cuts the ASTM D4894 microtensile Dumbbell profile: 4.8 mm wide narrow section, 38.1 mm overall length
Two styles: hardened steel for 0–5 mm, ribbon steel for 0–3 mm
Integral ejector (hardened) or foam pad (ribbon) pushes each specimen free
Fits manual, pneumatic and hydraulic sample-cutting presses
Free test cuts on your material before you order
Custom profiles, multi-cavity dies and nick/notch features on request
Downloads: Ribbon Steel Die Data Sheet (PDF)
Standards: ASTM D4894
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Precision cutting die for ASTM D4894 microtensile Dumbbell specimens
This Universal Grip die cuts the microtensile Dumbbell (tensile specimen) defined in ASTM D4894: Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials. ASTM D4894 specifies requirements for granular PTFE resins used in compression molding and ram extrusion. Tensile strength and elongation are measured on microtensile dumbbells die-cut from sintered molded sheet.
We make it in two styles so the die suits the material you cut. The one-piece hardened steel die is machined from a single piece of steel and holds its edge on rigid & semi-rigid plastics, filled compounds, rubber, sheet & film from 0 to 5 mm thick. The ribbon steel (steel-rule) die uses a precision-bent hardened rule in a laser-cut plywood base with a foam ejection pad, an economical choice for rubber, elastomers, TPE, foams, soft plastics & films up to 3 mm. Both cut the same ASTM D4894 profile.
ASTM D4894 specimen dimensions
The die is cut to the nominal profile in ASTM D4894: overall length (min) 38.1 mm, width of narrow section 4.8 mm, width of ends 15.9 mm, distance between tabs (gauge) 22.25 ± 0.05 mm, initial grip separation 22.0 ± 0.05 mm and specimen thickness 1.5 ± 0.3 mm. Always check your current edition of the standard for tolerances and the test procedure.
Where it is used
Typical uses for ASTM D4894 specimens include seals & gaskets, bearings & slide pads, valve seats and chemical-resistant liners.
Cutting specimens with the die
Put the die on an arbor press or a pneumatic press, set your sheet on a nylon cutting plate and press through in one stroke; the ejector pushes the specimen out ready to test. No press yet? An adapter lets the die run on your universal testing machine. Send us a sample of your material and we will make test cuts free of charge, so you can confirm the edge quality before you order. Hardened dies can be re-sharpened with our die sharpening tool.
ASTM D4894 Cutting Die Specifications
STANDARD
ASTM D4894
SPECIMEN
Microtensile Dumbbell
SPECIMEN TYPE
Tensile specimen
OVERALL LENGTH (MIN)
38.1 mm
WIDTH OF NARROW SECTION
4.8 mm
WIDTH OF ENDS
15.9 mm
DISTANCE BETWEEN TABS (GAUGE)
22.25 ± 0.05 mm
INITIAL GRIP SEPARATION
22.0 ± 0.05 mm
SPECIMEN THICKNESS
1.5 ± 0.3 mm
HARDENED STEEL DIE
One-piece machined steel, 0–5 mm material, integral ejector plate
RIBBON STEEL DIE
Steel rule in plywood base, 0–3 mm material, foam ejection pad
PRESS COMPATIBILITY
Manual, pneumatic & hydraulic sample-cutting presses
PART NUMBERS
UGC-CDH-D4894 (hardened) · UGC-CDR-D4894 (ribbon)
Models & Options
Hardened Steel Cutting Die — One-piece machined, hardened and precision-finished; rigid & semi-rigid plastics, filled compounds, rubber, sheet & film; 0–5 mm; integral ejector plate; re-sharpenable (UGC-CDH-D4894)
Ribbon Steel Cutting Die — Precision-bent hardened steel rule in a laser-cut plywood base with closed-cell foam ejection pad; rubber, elastomers, TPE, foams, soft plastics & films; 0–3 mm; economical, fast turnaround (UGC-CDR-D4894)
Press mounting — Matched to your press make and model, or an adapter for your universal testing machine (Specify at order)
Custom features — Custom profiles, multi-cavity dies and nick/notch features on request (Custom)
What's Included
ASTM D4894 cutting die in your chosen style (hardened or ribbon steel)
Specimen ejection: integral ejector plate (hardened) or foam ejection pad (ribbon)
Mounting to suit your press — tell us the make and model
Data sheet with the nominal profile dimensions
Supported Test Standards
ASTM D4894 — Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
Compatible Grips & Fixtures
Arbor press — Benchtop press for cutting microtensile Dumbbell specimens with this die
Sample die press — Specimen-preparation presses and tools
Wedge grips — Self-tightening wedge grips for rigid plastic dumbbells
Pneumatic grips — Constant clamping force for thin or soft plastics
Die sharpening tool — Restore the cutting edge of a hardened steel die
Marking tool — Repeatable 22.25 mm gauge marks for video extensometers
Plastics testing — Grips and fixtures for plastic film, sheet and molded parts
“Customer quote”
Related Equipment
JIS K7137-2-A Cutting Die
PTFE Small Dumbbell (Type A) · 5 × 12 mm narrow section
JIS K7137-2-B Cutting Die
PTFE Dumbbell (Type B) · 6.0 × 33 mm narrow section
JIS K7139 Type A1 Cutting Die
Multipurpose Test Specimen A1 · 10.0 × 80 mm narrow section
JIS K7139 Type A2 Cutting Die
Multipurpose Test Specimen A2 · 10.0 × 60.0 mm narrow section
ASTM D4894 Cutting Die FAQ
What is the ASTM D4894 test used for?
ASTM D4894 specifies requirements for granular PTFE resins used in compression molding and ram extrusion. Tensile strength and elongation are measured on microtensile dumbbells die-cut from sintered molded sheet.
What are the ASTM D4894 specimen dimensions?
The die cuts the nominal ASTM D4894 profile: overall length (min) 38.1 mm, width of narrow section 4.8 mm, width of ends 15.9 mm, distance between tabs (gauge) 22.25 ± 0.05 mm, initial grip separation 22.0 ± 0.05 mm and specimen thickness 1.5 ± 0.3 mm. These values come from the standard; check your current edition for tolerances.
Hardened steel or ribbon steel: which ASTM D4894 die should I choose?
For rigid and semi-rigid plastics, filled compounds and sheet up to 5 mm, choose the hardened steel die. The ribbon steel die is the economical option for soft plastics and films up to 3 mm.
Which press do I need for the ASTM D4894 die?
The die fits manual, pneumatic and hydraulic sample-cutting presses. On our arbor press it mounts with a lateral screw, and an adapter lets it run on a universal testing machine. Tell us your press make and model and we will match the mounting.
How do I grip and measure ASTM D4894 specimens?
Hold the wide ends in wedge grips or pneumatic grips so the specimen is loaded straight along its axis. The gauge length is 22.25 ± 0.05 mm; our marking tool applies repeatable gauge marks for video extensometers.
Can you make test cuts on my material?
Yes. Send us a sample of your sheet and we will make test cuts free of charge, so you can see the edge quality and confirm the right die style before you order.
Can you make a custom or multi-cavity ASTM D4894 die?
Yes. We make custom profiles, multi-cavity dies and nick or notch features on request. Send the drawing or standard, your material and thickness, and your press model.