MATERIAL DATA SHEETMaterialDataSheetSAFStratasys
SAF™ PP(Polypropylene)
Extended Material Datasheet

2Overview
Processed with SAF™ technology on the Stratasys H350™ 3D printer, SAF PP
delivers production-grade polypropylene parts for high-volume demands—driving
new areas of business growth. Stratasys SAF PP enables a high nesting density
while maintaining exceptional surface finish and dimensional accuracy, ensuringconsistent, high-quality production-level yields. With its superior chemical
resistance, weldability, light weight, and watertight properties, SAF PP is ideal fora wide range of applications across diverse industries.

Contents:
PP H350 Validation Build Plan .........................................................

3

Mechanical Properties .....................................................................

4UTS, EaB and Modulus .............................................................

6Validation Tracking of Z UTS and Z Standard Deviation .......

8

Physical Properties ...........................................................................

9

3

PP H350 Validation Build Plan
Comprehensive Sample Sizes

The mechanical data comes from over 2,000 tensile specimens (~950 in Y/X and 1,100 in Z) all printed in >80
builds from 5 different printers split between 2 locations. Three different supplier batches of PP powder were also
used for the validation. This is shown in graphical representation in Figure 1.

Location 1

In addition to the mechanical tensile test pieces, over 390 flexural specimens (260 in X/Y and 130 in Z) and 375
impact specimens (250 in X/Y and 125 in Z), printed across 42 builds across the 5 printers and 2 locations werealso tested.

++++
Dataset from>80 builds
3 batches of powder
2 locations>2,000 tensile specimens+++41 builds

40 builds

Location 2+Figure 1: Graphic representation of the number of machines and test builds used to generatemechanical property dataset for the PP extended datasheet

4Mechanical Properties
The tensile properties in this datasheet were generated from ASTM tensile bars from two builds: the Tensile Test
Capability build (TTC) and the Full Standard Build (FSB). The builds are shown in full in Figure 2 with the tensile
specimens isolated in Figure 3.
Both the TTC and FSB were built over 40 times during validation on the Stratasys H350 across 5 different machinesand 2 locations. Both PP test builds have been uniquely designed to test the mechanical performance from differingbuilds containing different part geometries to showcase consistent, repeatable and predictable part properties buildto-build.
The TTC contains a spread of ASTM D638-14 Type 1 tensile specimens in four orientations: ZX (upright) XZ (on end),and XY and YX (laid flat).
Additional parts are nested around the 34 tensile specimens, creating a nesting density of 7%. The build also
contains a further 15 ZX specimens in cages. These were prepared as a backup to test in case the part properties forcertain parts dropped below the lower control limit.1
The FSB contains ASTM D638-14 Type 1 tensile specimens in two orientations: ZX (upright) and YX (laid flat). The
16 specimens (shown in Figure 2B and 3B) are placed within the test build surrounded by other parts achieving anesting density of 12%.
1Caged parts were not tested during PP validation as the average Z tensile properties did not fall below the LCL for any builds.

5Other Mechanical Properties
The FSB also contains Flexural, Impact and physical property specimens as well as give-away parts to demonstratethat both mechanical properties and part aesthetics can be achieved in the same build.

Figure 2: The FSB (A) and TTC (B) test builds used to generate the mechanical data during PP validation.

Figure 3: The placement of the XZ, ZX and YX tensile specimens ONLY from the TTC (A), and the FSB (B).

Standard Build and Test Practices
The builds were prepared using GrabCAD Print Pro. The parts were built with standard machine settings following
the H350 installation process. The material consisted of 70% used powder and 30% virgin powder by mass, as per
H350 guidelines. A total of 3 different batches of PP were tested during the PP validation, all of which were used in
the data below.
Post processing of parts was performed in accordance with H350 guidelines. Builds were cooled for 24 hours after
completion. Parts were broken out by hand, finishing with automated bead blasting for complete powder removal.
All testing was to ASTM or ISO standards where applicable.

6PropertyMean

Standard Deviation

Unit

Standard

Tensile Strength (X,Y)

26.5 (3840)

0.7 (106)

MPa (psi)

ASTM D638-14

Tensile Strength (Z)26.1 (3785)

1.1 (160)

MPa (psi)

ASTM D638-14

Elongation at Break (X,Y)

24

4.4%

ASTM D638-14

Elongation at Break (Z)112.1%

ASTM D638-14

0.2% Offset Yield Strength (X,Y)

12.5 (1810)

MPa (psi)

ASTM D638-14

0.2% Offset Yield Strength (Z)12.7 (1840)

MPa (psi)

ASTM D638-14

Tensile Modulus (X,Y)

1250 (182)130 (19)MPa (ksi)

ASTM D638-14Tensile Modulus (Z)1260 (183)145 (21)MPa (ksi)

ASTM D638-14

Flexural Strength (X,Y)

26.5 (3810)

MPa (psi)

ASTM D790-17

Flexural Strength (Z)30 (4290)

MPa (psi)

ASTM D790-17

Flexural Modulus (X,Y)

832 (120)

121 (18)

MPa (ksi)

ASTM D790-17

Flexural Modulus (Z)

923 (133)

62 (9)MPa (ksi)

ASTM D790-17

Notched Impact Strength (X,Y)

3.6 (1.7)

kJ/m2 (Ft.lbf/in2)

ASTM D256-10

Notched Impact Strength (Z)

2.7 (1.3)

kJ/m2 (Ft.lbf/in2)

ASTM D256-10

Poisson’s ratio (X,Y)

0.44-

ASTM D638-22

Poisson’s ratio (Z)

0.41

-

ASTM D638-22

The below histograms visualize the PP UTS (Figure 4), EaB (Figure 5) and Modulus (Figure 6) data presented in thisdatasheet for both X/Y and Z orientations.

Ultimate Tensile Strength (X/Y and Z)(n=2048 specimens, 81 builds, 5 machines)

Figure 4: Histogram showing the probability density for Z and X/Y UTS from over 2000 tensile specimens tested during PPvalidation on the H350.

7Elongation at Break (X/Y and Z)(n=2045 specimens, 81 builds, 5 machines)

Figure 5: Histogram showing the probability density for Z (blue) and X/Y (orange) EaB from over 2000 tensile specimens tested
during PP validation on the H350.

Modulus (X/Y and Z)(n=2042 specimens, 81 builds, 5 machines)

Figure 6: Histogram showing the probability density for Z (blue) and X/Y (orange) Modulus from over 2000 tensile specimens
tested during PP validation on the H350.

8Validation Tracking of Z UTS
During the PP validation, ZX UTS is tracked build-to-build as a means to monitor layer-to-layer fusion of parts.
A lower control limit (of 23MPa) was determined during the verification which acted as a point of reference when
testing multiple machines and batches of powder.
Below in Figure 7 the ZX UTS from the 81 validation builds is shown as a function of Build Run ID. The SD foreach corresponding build from the samples tested from each build (15 tensile specimens for a TTC, 12 for a FSB)
is shown on the same graph.

ZX UTS Tracking Through PP Validation(n=81 builds, 1099 specimens)

Figure7: Polypropylene Z UTS and SD vs build run ID for the validation builds used in this datasheet.

9

Physical Properties
GeneralValue

UnitStandard

Part Specific Gravity

0.89

-

ASTM D792-13

Virgin Particle Size D50

60-70 (2.4-2.8)μm (thou)-Virgin Powder Melting Point

140 (284)°C (°F)-

ThermalValue

Unit

Standard

Heat Deflection Temperature (0.45MPa/65psi)

107 (225)°C (°F)ASTM D648

Heat Deflection Temperature (1.82MPa/264psi)

56 (132)°C (°F)ASTM D648

Coefficient of Thermal Expansion

169 (94)µm/°C.m (thou/in.°F)

ASTM E831

Specific Heat Capacity (20°C/68°F)

1.76 (0.4)

J/g.°C (BTU/lbm.°F)

ASTM E1952

Thermal Conductivity (23°C/68°F)

0.196 (1.36)

W/°C.m (BTU/hr.ft.°F)

ASTM E1952

Electrical

MeanUnit

Standard

Surface resistivity

5.24 x10

Ohm

ASTM D257

Volume resistivity

7.39 x1015

Ohm-cmASTM D257

Bio compatibility

ResultUnit

Standard

Determination of Skin Irritation

Non-irritant

N/A

ISO 10993-10 2014-10 /OECD 439 2015-07

Determination of Cytotoxicity

Material shows
no cytotoxic effect

N/A

DIN EN ISO 10993-5, 2009,
Annex D15FlammabilityMeanUnit

Standard

UL94 HB

Pass*N/AUL94 (2013)

Reusability

ValueUnit

Standard

Typical Powder Mix Ratio (Virgin)

30%-* Product is not currently UL Blue Card Registered.
Disclaimer:1

 ustomer acknowledges the contents of this document and that Stratasys parts, materials, and supplier are subject to its standard terms and conditions, available on
Chttp://www.stratasys.com/legal/terms-and-conditions-of-sale, which are incorporated herein by reference.

2

The specifications and/or information on which this document is based are subject to change without notice.

3

 he information presented are typical values intended for reference and comparison purposes only. They should not be used for design specifications or quality control purposes. End-use
Tmaterial performance can be impacted (+/-) by, but not limited to, part design, end-use conditions, test conditions, etc. Actual values will vary with build conditions. Tested parts were built on
the Stratasys H350 3D printer. Product specifications are subject to change without notice. The performance characteristics of these materials may vary according to application, operating
conditions, or end use. Each user is responsible for determining that the Stratasys material is safe, lawful, and technically suitable for the intended application, as well as for identifying the proper
disposal (or recycling) method consistent with applicable environmental laws and regulations. Stratasys makes no warranties of any kind, express or implied, including, but not limited to, thewarranties of merchantability, fitness for a particular use, or warranty against patent infringement.

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