Printed from Kezuriba (kezuriba.net/en/materials/pp/)
PP
ISO N (non-ferrous)Some makers: ISO O (other (outside the six ISO groups))Tool makers differ on the ISO workpiece group: MAPAL (machining group N4-1 "thermoplastics" under N of ISO 513. This resin is not named specifically): N[4]; Sandvik Coromant: O (Thermoplastics and thermosets are grouped under O (Other, outside ISO))[5]. Choose insert grades and data according to the maker of the tool you use.
Polypropylene (semi-crystalline general-purpose resin. Sheet and rod for machining come as homopolymer (PP-H) and copolymer. Values are mainly for the homopolymer). Standard: ISO 19069-1:2015, ASTM D4101.
📄Related standards (ISO, ASTM, JIS)
Standards that define the material or stock shapes. Standard texts are paid, so only titles and scopes checked on public pages are shown.
| Spec | Scope | Confidence |
|---|---|---|
| ISO 19069-1:2015 | Plastics — Polypropylene (PP) moulding and extrusion materials — Part 1: Designation system and basis for specificationsStandard for designation of PP molding and extrusion materials (successor to the former ISO 1873-1) | Agrees in 2+ sources[1] |
| ISO 19069-2:2024 | Plastics — Polypropylene (PP) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of propertiesHow to prepare test specimens and measure properties | Agrees in 2+ sources[9] |
| ASTM D4101 | Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion MaterialsClassification of PP materials for injection molding and extrusion. Röchling lists it as a standard that Polystone P complies with | Agrees in 2+ sources[2][3] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
📋Typical properties
Plastic properties vary with maker, grade and processing. These are makers’ published typical values, not guaranteed values. For design, check the data sheet of the grade you use.
| Property | Value | Test method | Source of value |
|---|---|---|---|
| Tensile yield stress | 33 MPa | DIN EN ISO 527-1 | Typical value (Ensinger TECAFINE PP grey, homopolymer) One source / reference[6] |
| Tensile strength | 34 MPa | ISO 527-1/-2 | Typical value (MCG Proteus Homopolymer PP Natural) One source / reference[7] |
| Tensile strength (yield, ASTM) | 4700 psi | ASTM D638 (73°F) | Typical value (Röchling Polystone P homopolymer, US brochure 2017). About 32 MPa. The MCG Proteus ASTM column in the same table is 4800 psi One source / reference[3] |
| Tensile modulus | 1700 MPa | DIN EN ISO 527-1 | Typical value (Ensinger TECAFINE PP grey) One source / reference[6] |
| Tensile modulus | 1800 MPa | ISO 527-1/-2 | Typical value (MCG Proteus Homopolymer PP Natural) One source / reference[7] |
| Flexural modulus | 195 ksi | ASTM D790 | Typical value (MCG Proteus Homopolymer PP Natural, ASTM column). About 1,340 MPa. The ISO 178 column is blank One source / reference[7] |
| Durometer hardness | 72 Shore D | DIN EN ISO 868 (Ensinger) / ASTM (Röchling. The test standard column of the table says D785) | Typical value (Ensinger TECAFINE PP grey, Röchling Polystone P homopolymer) Agrees in 2+ sources[6][3] |
| Durometer hardness | 78 Shore D | ISO 868 / ASTM D2240 | Typical value (MCG Proteus Homopolymer PP Natural) One source / reference[7] |
| Deflection temperature under load (1.8 MPa) | 57 ℃ | ISO 75-1/-2 Method A | Typical value (MCG Proteus Homopolymer PP Natural) One source / reference[7] |
| Continuous use temperature (guideline) | 90 ℃ | 20,000 hours in air | Guideline (MCG Proteus Homopolymer PP Natural) One source / reference[7] |
| Continuous use temperature (guideline) | 0–+100 ℃ | Service temperature range (test method not stated) | Guideline (Ensinger TECAFINE PP grey) One source / reference[6] |
| Continuous use temperature (guideline) | 180 °F | Continuous use temperature in air (maximum) | Guideline (Röchling Polystone P homopolymer, US brochure) One source / reference[3] |
| Coefficient of linear thermal expansion | 16 ×10⁻⁵/K | DIN EN ISO 11359-1;2 | Typical value (Ensinger TECAFINE PP grey) One source / reference[6] |
| Coefficient of linear thermal expansion | 150 µm/(m·K) | 23–100°C (test method not stated) | Typical value (MCG Proteus Homopolymer PP Natural). Equivalent to 15×10⁻⁵/K. The ASTM E831 column is 43 µin/in/°F One source / reference[7] |
| Coefficient of linear thermal expansion (ASTM) | 6×10⁻⁵ in/(in·°F) | ASTM D696 | Typical value (Röchling Polystone P homopolymer, US brochure. HDPE and copolymer in the same table have the same value) One source / reference[3] |
| Water absorption (23°C water, 24 h) | <0.1 % | ISO 62 | Typical value (MCG Proteus Homopolymer PP Natural). Saturation is also <0.1% One source / reference[7] |
| Dielectric breakdown strength | 52 kV/mm | IEC 60243-1 | Typical value (Ensinger TECAFINE PP grey) One source / reference[6] |
| Dielectric breakdown strength (ASTM) | 570 V/mil | ASTM D149 | Typical value (MCG Proteus Homopolymer PP Natural). About 22 kV/mm One source / reference[7] |
| Melting point | 165 ℃ | ISO 11357-1/-3 (DSC) | Typical value (MCG Proteus Homopolymer PP Natural) One source / reference[7] |
⚖Density
0.91 g/cm³
Ensinger TECAFINE PP grey, MCG Proteus Homopolymer PP Natural (ISO 1183-1), Röchling Polystone P (ASTM D792)
Calculate weight in PP →🏷Common trade names (makers)
Plastics are often called by a maker’s product name. Names are trademarks of their owners.
🔧Machinability notes (as stated in the sources)
- Röchling (Polystone G and P brochure): All woodworking and metalworking tools can be used. For sawing, use a high-speed circular saw or band saw; a light tooth set gives a cleaner surface. Tooth spacing of 5/8 inch or more is recommended. For PP in particular, it is essential to clear chips quickly to prevent melting. For milling, high feed and rotation speed with low heat generation are best; guidelines are 9,000–12,000 rpm and feed of 250–300 inch/min[3]
- Röchling machining conditions (Polystone P homopolymer): Sawing: clearance angle 20–30°, rake angle 2–5°, 500 m/min, tooth pitch 3–8 mm. Turning: clearance angle 6–10°, rake angle 0–5°, approach angle 45–60°, 250–500 m/min, feed 0.1–0.5 mm/rev. Drilling: clearance angle 5–15°, rake angle 10–20°, point angle 90°, 50–150 m/min, feed 0.1–0.3 mm/rev. Milling: clearance angle 10–20°, rake angle 5–15°, 250–500 m/min[8]
- Röchling (general notes on machining shapes): Plastics conduct heat poorly, and if the temperature rises too far the surface softens and becomes sticky. Chip removal is the best cooling, and coolant can also be used for long cuts. The shapes are supplied annealed, but high-precision parts with heavy material removal may need intermediate annealing[8]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- iso.org https://www.iso.org/standard/63872.html
- astm.org https://www.astm.org/Standards/D4101.htm
- roechling.com https://www.roechling.com/fileadmin/downloads/Roechling_Industrial/Brochures/EN/Polystone/…
- mapal.com https://mapal.com/medias/sys_master/root/hea/hd5/10787307716638/MMG-2025__EN/MMG-2025-EN.p…
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- ensingerplastics.com https://www.ensingerplastics.com/en-gb/shapes/products/polypropylene-tecafine-pp-grey
- mcam.com https://www.mcam.com/mam/37137/PE-Proteus%C2%AE%20Homopolymer%20PP%20Natural_en_US.pdf
- roechling.com https://www.roechling.com/fileadmin/downloads/Roechling_Industrial/Brochures/EN/Lieferprog…
- iso.org https://www.iso.org/standard/83765.html
- roechling.com https://www.roechling.com/industrial/materials/thermoplastics/industrial-plastics/pp-h/pol…
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