A datasheet describes one named grade under specified test conditions. A standard specimen's value does not automatically describe your printed part. Keep manufacturer, grade, unit, method, direction and conditioning attached to every number.
Download the English project worksheet. Open it as UTF-8 CSV, replace the guide context with your project inputs and record observations separately from acceptance decisions. Blank cells do not indicate a passed check.
Start with the property your application needs
Record trade name, manufacturer, variant and datasheet revision. Confirm which grade is actually proposed for production. Do not substitute another PETG product because the family name matches.
Choose a question: heat, stiffness, impact, moisture or cleaning. Stiffness concerns deflection; elongation concerns deformation under its stated test. One high number cannot answer both. Use the PLA/PETG comparison to define the application, then put a part-level check in the prototype assessment.
Read method, units and conditioning together
Read value, unit and spread together. Tensile strength, modulus, elongation and heat deflection are different properties. Record the method, specimen, temperature, moisture and loading rate where supplied. A heat-deflection result under a specified load is not a universal maximum service temperature.
Keep the source example's exact conditions
UltiMaker PETG Technical Data Sheet v1.00, dated 29 April 2022, reports these values and conditions:
| Source field | Recorded context | Limitation |
|---|---|---|
| Young's modulus | ASTM D3039, 1 mm/min: XY 1,939 ± 28 MPa; YZ 1,874 ± 31; Z 1,711 ± 45 | Direction matters; not part stiffness |
| Heat deflection | ISO 75-2/B, 0.455 MPa: 76.2 ± 0.8°C | Not a general service-temperature limit |
| Printed specimen settings | 0.15 mm layers, AA 0.4 printcore, 100% infill, Cura 4.9 | Does not establish other settings or geometry |
| Conditioning | Room temperature, at least 24 hours before measurement | Not long-term use exposure |
| Specimens | Tensile 215 × 20 × 4 mm; HDT 80 × 10 × 4 mm | Not your final component |
Distinguish the specimen from the final component
The values apply to that cited product and document. They do not confirm stock, the production batch or performance of an OmniTechs part. A printed object also has seams, local geometry and layer directions; compare its load direction with the specimen's direction.
Make the missing inference visible
A fictional indoor holder is cleaned occasionally and carries light hand loads. Its planning record is:
| Field | Known input | Open question |
|---|---|---|
| Grade | UltiMaker PETG used as a source example | Actual product not chosen |
| Load | Light hand use | Quantify the action |
| Cleaning | Product and contact time unknown | Compatibility unresolved |
| Critical dimension | 25.0 mm slot after cleaning | Agree tolerance and measurement |
| Orientation | Undecided | Not comparable to specimen direction |
| Decision | No grade approval | Obtain product source and trial plan |
No holder was tested. This record is more useful than assigning it a tensile-strength number from an arbitrary PETG sheet.
Ask for evidence about the part where it matters
Use the actual grade, critical wall and orientation in a trial. Agree measurement and acceptance beforehand. Do not rank two datasheet numbers if their units, standards or conditioning differ; first establish a comparable method or have the difference assessed.
Take the unresolved requirement to material selection
Take the exact source, relevant property and missing context to the material chooser. Confirm whether the proposed grade matches the document. For the holder, the next useful question is which cleaner is used and whether the slot retains its function afterwards. A bounded prototype request with that condition is more useful than another generic PETG strength number.