PP-T20 · grade
PP-T20 T20-HF
Properties of the T20-HF condition, compared with the other PP-T20 grades.
Choose for thin-wall, long flow-path parts such as air ducts and large interior panels, where MFR 30–60 eases filling and shortens cycle time at the cost of some impact strength.
What is PP-T20 T20-HF?
PP-T20 T20-HF is PP-T20 in the T20-HF grade — choose for thin-wall, long flow-path parts such as air ducts and large interior panels, where MFR 30–60 eases filling and shortens cycle time at the cost of some impact strength. PP-T20 T20-HF has a yield strength of 29 MPa (4.21 ksi) and a tensile strength of 30 MPa (4.35 ksi) — weaker than 75% of polymer grades. Elongation at break is 12% and the elastic modulus is 2.4 GPa (0.348 Msi). PP-T20 T20-HF has a density of 1.05 g/cm³ (0.0379 lb/in³), lighter than 69% of polymer grades. Its glass-transition temperature is -10°C (14 °F). T20 is the default condition FabDigit quotes; T20-HF is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 98% of polymer grades
- Readily welded — 80/100, better than 84% of polymer grades
- Low moisture uptake — 0.05%, better than 84% of polymer grades
- Conducts heat well — 0.27 W/m·K (0.156 BTU/hr·ft·°F), better than 77% of polymer grades
Limitations
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
- Low strength — 29 MPa (4.21 ksi), worse than 75% of polymer grades
PP-T20 T20-HF properties
Typical room-temperature values for PP-T20 T20-HF — 6 properties are specific to this condition; the rest are grade-level values shared by every PP-T20 grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical5
PP-T20 T20-HF has a density of 1.05 g/cm³ (0.0379 lb/in³), lighter than 69% of polymer grades. Its glass-transition temperature is -10°C (14 °F).
Mechanical12
PP-T20 T20-HF has a yield strength of 29 MPa (4.21 ksi) and a tensile strength of 30 MPa (4.35 ksi) — weaker than 75% of polymer grades. Elongation at break is 12% and the elastic modulus is 2.4 GPa (0.348 Msi).
Thermal11
PP-T20 T20-HF is rated for continuous service to 105°C (221 °F). It conducts heat at 0.27 W/m·K (0.156 BTU/hr·ft·°F), better than 77% of polymer grades. Thermal expansion is 80 µm/m·K (44.4 µin/in·°F).
Electrical7
PP-T20 T20-HF is an electrical insulator with a dielectric strength of 24 kV/mm (609.6 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 63% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PP-T20 T20-HF takes about 72 MJ of energy and emits 1.9 kg of CO₂ — less than 93% of polymer grades. Typical recycled content is 10%.
Manufacturability8
PP-T20 T20-HF's machinability is good (62/100, better than 59% of polymer grades); weldability very good (80/100); formability good (55/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other PP-T20 grades and fills
PP-T20 is also supplied in 9 other conditions. The full side-by-side table is on the PP-T20 overview.
- T20DefaultUse as the default balance of stiffness, heat resistance, impact and cost for automotive interior and appliance structural parts; 30 MPa tensile at 1.05 g/cm³ with 12% elongation.30 MPa tensile
- T30Choose for high rigidity (3.2 GPa), 110 °C service and low warpage in large parts such as instrument-panel carriers, air ducts and appliance bases, at the cost of ductility (7%).32 MPa tensile
- T40Use the highest talc loading for maximum stiffness (4.2 GPa), 115 °C service and low shrinkage in sound-deadening mass parts and engine covers; toughness and melt flow drop noticeably.31 MPa tensile
- T10Pick the light talc loading when impact strength, appearance and low density (0.97 g/cm³) matter more than rigidity; modulus is only 1.8 GPa but elongation reaches 30% and service 100 °C.27 MPa tensile
- T20-FRUse when an appliance or electrical housing must meet UL 94 V-0 or V-2; the flame retardant lowers impact and flow to 26 MPa tensile, and phosphorus–nitrogen systems are cleaner than brominated.26 MPa tensile
- T20-IMPick for bumpers and door panels needing -30 °C falling-ball impact, where EPDM/POE toughening lifts elongation to 120% but cuts modulus to 1.6 GPa and tensile to 21 MPa.21 MPa tensile
- T20-HFChoose for thin-wall, long flow-path parts such as air ducts and large interior panels, where MFR 30–60 eases filling and shortens cycle time at the cost of some impact strength.30 MPa tensile
Working with PP-T20 T20-HF
Is PP-T20 easy to machine?
Mills, drills and saws easily, but the soft matrix throws burrs, so use sharp large positive-rake tools with high spindle speed and low feed. Talc is mildly abrasive; carbide cutting edges are recommended.
Can PP-T20 be welded?
Hot-plate, ultrasonic, vibration friction and hot-gas extrusion welding all apply, with filler reducing weld strength to roughly 70–90% of the parent material. Solvent bonding is not possible; flame- or plasma-treat surfaces before adhesive bonding.
Can PP-T20 be formed, bent or molded?
Injection molding is the primary route: melt 200–250 °C, mold 25–70 °C, with adequate back pressure to disperse the talc. Drying is not essential but damp pellets should be dried 2 h at 80 °C; keep wall thickness uniform to control about 1% shrinkage and warp. Sheet can also be extruded and thermoformed.
What surface finishes work on PP-T20?
Surface energy is low, so flame, corona or plasma treatment plus an adhesion-promoting primer is required before spray painting or printing. Common practice is in-mould grain for paint-free surfaces; plating does not apply.
PP-T20 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| talc (hydrated magnesium silicate fillerfine talc, median particle size typically 1-5 um | 18 – 22 | 20 |
| antioxidant / heat stabilizer packagehindered phenol + phosphite | 0.1 – 0.5 | 0.3 |
| coupling agent / dispersant (PP-g-MAH, s | 0 – 1 | 0.4 |
| pigment / carbon blackcoloring plus partial weathering protection | 0 – 2 | 0.5 |
| polypropylene (homo/impact copolymer)matrix resin; impact grades contain approx. 5-15% EPR phase | ≥ 78 (balance) | — |
PP-T20 T20-HF — frequently asked
What is PP-T20 T20-HF used for?
PP-T20 T20-HF is typically used for automotive door panels and instrument panels, washing machine and dryer housings, HVAC ducting and battery boxes. In short: low-cost PP stiffening route; cheaper than PP-GF; automotive interior workhorse.
What is the yield strength of PP-T20 T20-HF?
PP-T20 T20-HF has a typical yield strength of 29 MPa (4.21 ksi) and a tensile strength of 30 MPa (4.35 ksi) — weaker than 75% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is PP-T20 T20-HF easy to machine?
Reasonably — machinability is rated good (62/100, better than 59% of polymer grades). Mills, drills and saws easily, but the soft matrix throws burrs, so use sharp large positive-rake tools with high spindle speed and low feed. Talc is mildly abrasive; carbide cutting edges are recommended.
Can PP-T20 T20-HF be welded?
Yes — weldability is rated very good (80/100). Hot-plate, ultrasonic, vibration friction and hot-gas extrusion welding all apply, with filler reducing weld strength to roughly 70–90% of the parent material. Solvent bonding is not possible; flame- or plasma-treat surfaces before adhesive bonding.
What surface finishes work on PP-T20 T20-HF?
Surface energy is low, so flame, corona or plasma treatment plus an adhesion-promoting primer is required before spray painting or printing. Common practice is in-mould grain for paint-free surfaces; plating does not apply.
Can PP-T20 T20-HF be formed, bent or molded?
Injection molding is the primary route: melt 200–250 °C, mold 25–70 °C, with adequate back pressure to disperse the talc. Drying is not essential but damp pellets should be dried 2 h at 80 °C; keep wall thickness uniform to control about 1% shrinkage and warp. Sheet can also be extruded and thermoformed.
What is the maximum service temperature of PP-T20 T20-HF?
PP-T20 T20-HF is rated for continuous use to about 105°C (221 °F), and briefly to 140°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM D4101 Standard Classification for Polypropylene Injection and Extrusion Materials — ASTM International (2023)
- ISO 19069-2 Plastics — Polypropylene (PP) moulding and extrusion materials, Part 2 — ISO (2016)
- ASM Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- CAMPUS plastics database — talc-filled PP compounds (ISO 10350 datasets) — CAMPUS / CWFG (2024)
- Talc-filled PP compound datasheets (LyondellBasell Hostacom, Borealis Daplen, SABIC STAMAX/PP, PP) (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.