FREQUENTLY ASKED QUESTIONS
Markforged composite parts are primarily composed of base plastic materials.
These base materials can be reinforced with continuous fibers through a
process called CFR – Continuous Fiber Reinforcement. Composite Materials are
available for both the Desktop and Industrial Series 3D printers.
What are the dimensions of the
test specimens used for the base material tests?
Tensile: ASTM D638 type IV beams ; Flexural: 3-PT Bending 4.5 in (L) x 0.4
in (W) x 0.12 in (H). Plastic specimens are printed with full infill.
Do Markforged composite materials
need to be stored in a dry box?
The plastic base materials do need to be stored in a dry box while the
fibers do not. Each plastic package will come with desiccant packs to
ensure that material stays dry.
What is the shelf life of
Markforged composite 3D printing materials?
Unopened plastics and fibers have a minimum shelf life of two years from
the date of manufacture when stored in their original package at 55°-90°
F. Unsealed plastic (stored in a dry box) and fiber spools can be stored
for up to one year.
What are the test specimen details
Fiber specimens are designed to maximize mechanical performance and are
printed with unidirectional fiber without walls. Tensile test specimens:
9.8 in (L) x 0.5 in (H) x 0.048 in (W) (Carbon Fiber composites), 9.8 in
(L) x 0.5 in (H) x 0.08 in (W) (Fiberglass and Kevlar® composites).
Compressive test specimens: 5.5 in (L) x 0.5 in (H) x 0.085 in (W) (Carbon
Fiber composites), 5.5 in (L) x 0.5 in (H) x 0.12 in (W) (Kevlar® and
Fiberglass composites). Flexural test specimens: 3-pt. Bending, 4.5 in (L)
x 0.4 in (W) x 0.12 in (H).
What are the details of the UL-94
test for Onyx FR?
Onyx FR is Blue Card certified down to a thickness of 3mm.
What is special about the
aerospace-grade materials, Onyx FR-A and Carbon Fiber FR-A?
Both Onyx FR-A and Carbon Fiber FR-A are designed for the requirements of
aerospace and have lot-level traceability qualified under 14 CFR 25.853.
Parts printed with these materials are FST compliant for aircraft
interiors (flame, smoke, toxicity). Onyx FR-A and Carbon Fiber FR-A are
also undergoing qualification through the NCAMP process. Every spool comes
with a CoC (Certificate of Conformance) and CoA (Certificate of Analysis).
What are the test conditions for
heat deflection temperatures?
Heat-deflection temperature was tested at 0.45 MPa, 66 psi (ASTM D648-07