ISO 10350-1:2025, published in its fourth edition, sets the test conditions, specimen geometry and reporting format for the single-point values that appear on injection-moulding-grade engineering plastic data sheets [S1][S7]. ISO 10350-2:2020 covers the equivalent single-point dataset for long- and continuous-fibre-reinforced plastics, with a fibre-length threshold greater than 7.5 mm prior to moulding [S3][S4].
The series exists because, without a common test recipe, a tensile modulus of 3.0 GPa from one supplier and a tensile modulus of 3.2 GPa from another may have been measured on different specimens at different speeds and pre-conditioning states. ISO 10350 fixes the test methods referenced in ISO 1043-1 designation codes, which is why the same data row on a POM homopolymer datasheet means the same thing vendor to vendor.
What ISO 10350 actually prescribes
ISO 10350-1 identifies specific test procedures for the acquisition and presentation of comparable data for certain basic properties of plastics, with each property specified by a single experimental value, although in certain cases properties are represented by two values obtained under different test conditions [S1][S2]. The properties included are those presented conventionally in manufacturers' data sheets, so tensile modulus, yield stress, strain at break, Charpy notched impact, density, melt volume-flow rate, moulding shrinkage, and post-moulding shrinkage are all single-row entries rather than curves.
ISO 10350-1 applies predominantly to unreinforced and reinforced thermoplastic and thermosetting materials that may be injection- or compression-moulded or prepared as sheets of specified thickness, while ISO 10350-2 deals specifically with long- or continuous-fibre-reinforced plastics [S3][S4]. Anything outside that scope, films, foams, coatings, and rotomoulded parts, falls back on other ISO or ASTM methods and should not be cross-quoted against ISO 10350 numbers.
2025 edition changes versus ISO 10350-1:2007
ISO 10350-1:2007 (Edition 2) was withdrawn and replaced by the new EN ISO 10350-1:2025, which the German DIN catalogue lists as the current national implementation under reference DIN EN ISO 10350-1 [S4][S6][S8]. The 2007 edition had been confirmed in systematic review in 2010, re-reviewed in 2015, and then opened for a fourth edition that surfaced in 2025 [S4].
For day-to-day datasheet use the structure is unchanged, with one tensile bar, one flexural bar, one Charpy bar and one disc, but the 2025 revision updates referenced test standards (ISO 527-2, ISO 178, ISO 180/ISO 179, ISO 1133, ISO 1183, ISO 294-1/-3/-4) to their current revisions and aligns the reporting table with modern CAMPUS/UL Prospector conventions [S1][S6]. Practically, an engineer comparing a 2025 PA66 GF30 data sheet against a 2007-vintage one can still overlay the rows directly, but the underlying conditioning and test-speed footnotes will have shifted.
How to read a single-point data sheet line by line
A conformant ISO 10350 row carries three elements: the property symbol, the numeric value, and the test method in parentheses. Tensile modulus is reported in MPa from ISO 527-1/-2 at 1 mm/min on a Type 1A or 1B specimen, tensile stress at yield from the same method at 50 mm/min, and Charpy notched impact strength from ISO 179-1/1eA in kJ/m² [S1][S2]. Two-value properties, principally stress at yield and strain at break, are presented at both 23 °C/50 % RH and the elevated or conditioned state the material is likely to face in service [S1].
Melt volume-flow rate (MVR) is reported in cm³/10 min at the manufacturer-declared temperature and load, and density in g/cm³ from ISO 1183, with moulding shrinkage reported both parallel and perpendicular to flow as a percentage [S1][S3]. Two shrinkage numbers matter because the differential is what drives warp on a flat part: a POM with 2.0 % flow / 1.8 % cross-flow will behave very differently from a 2.2 % / 1.4 % grade even though both have nominally the same flow shrinkage.
Single-point versus multi-point data: when to escalate
Single-point data are used for the initial phase of materials selection and for setting specifications for particular applications, per NPL Report DMM(A)166 [S9]. The same UK NPL report flags the second category of data, full stress-strain curves, creep modulus, fatigue S-N curves, and PV/T wear maps, as what is required once a candidate is shortlisted and a real part geometry is on the table.
That distinction matters on real specs. A glass-reinforced polyamide 66 datasheet may quote a tensile modulus of 9.5 GPa (ISO 527, dry) and a Charpy notched impact of 9 kJ/m², which is enough to choose between a 15 % and a 30 % glass loading. It is not enough to design a snap-fit clip that lives at 85 °C and 50 % RH for 50,000 hours; for that you need the conditioned modulus curve and the creep modulus at the operating stress.
Comparing options against selection criteria
ISO 10350-1 gives the data row, and the engineer supplies the criteria. For a structural part in a 100 °C environment, a baseline comparison on five common moulding grades would line up as follows, with all values single-point ISO 10350 / ISO 527 dry-as-moulded and only meant to illustrate the comparison structure, not to substitute for a supplier datasheet: tensile modulus 1.0–1.4 GPa for PP, 2.8–3.2 GPa for POM homopolymer, 2.4–2.8 GPa for PBT, 1.9–2.4 GPa for unmodified PC, and 9.0–10.5 GPa for PA66 GF30; Charpy notched impact 3–7 kJ/m² for PP, 5–7 kJ/m² for POM, 4–6 kJ/m² for PBT, 12–18 kJ/m² for PC, and 8–12 kJ/m² for PA66 GF30; moulding shrinkage 1.2–2.0 % PP, 1.7–2.2 % POM, 1.4–2.0 % PBT, 0.5–0.7 % PC, and 0.3–0.7 % PA66 GF30 (flow direction). [S4]
Cost-per-kg and moisture pick-up are not ISO 10350 rows and must be sourced separately, but the comparison grid still narrows the candidate list. The structural step is to overlay conditioned (50 % RH, 23 °C, ISO 1110) values on the dry numbers: a PA66 GF30's modulus drops roughly 30–40 % from dry to conditioned, while POM and PBT are essentially insensitive to humidity because their water absorption at 23 °C saturation sits below 0.3 %.
Limits, pitfalls and what ISO 10350 does not solve
ISO 10350-1 covers moulding materials prepared by injection moulding, compression moulding or as sheets of specified thickness, so it does not cover cast sheet, extruded film, or foamed grades [S4]. It also does not address long-fibre composites; for fibre lengths greater than 7.5 mm prior to moulding the engineer must move to ISO 10350-2:2020, which uses different specimens and accepts that "single-point" tensile strength on a long-fibre material is much more specimen-dependent than on a short-fibre grade [S3][S4].
Another pitfall is mixing property tables that mix ISO 10350 single-point values with multi-point CAMPUS or UL Yellow Card values. Manufacturers commonly publish both, and a 24 h-water-conditioned modulus number that was measured to ISO 1110 is not the same kind of datapoint as a 1,000 h creep modulus at 50 MPa, even if both sit on the same page. The single-point rule of thumb: if the table has no time or temperature dimension on the property, it is single-point ISO 10350; if the property is plotted or tabulated across more than one condition, it is multi-point and must be quoted with the full condition string.
Sourcing, standards and traceability
The authoritative source for the 2025 single-point framework is the ISO Online Browsing Platform entry for ISO 10350-1:2025 and the parallel EN ISO 10350-1:2025 from CEN, mirrored in the German DIN catalogue as DIN EN ISO 10350-1 and in commercial databases such as MadCAD and ITeH [S1][S6][S7][S8]. The earlier 2007 edition is formally withdrawn, although it remains widely cited on legacy data sheets and in older technical reports [S4].
For traceability, an engineer comparing two moulding-grade data sheets should record the ISO 10350-1 edition year, the cited test-conditions footnote (conditioned vs dry, test speed, specimen type), and whether the table pulls from ISO 10350-1 (moulding materials) or ISO 10350-2:2020 (long-fibre-reinforced). With those three notes attached, a cross-vendor PBT datasheet comparison becomes a one-line query instead of a half-day spreadsheet build. One trackable signal for the next revision cycle is whether ISO 10350-1 adds a conditioned-vs-dry twin-value column for the property list, in line with how CAMPUS already reports moisture-equilibrated PA6 and PA66 grades.
This topic is covered further in Mild Steel vs Low Carbon Steel: Same Material, Different Labels.