PP-B SHI
Additive grade
SHI = super-high-impact / elastomer-modified
Use for -40 °C ductility and no-break notched impact where low stiffness is acceptable.
Values for the SHI condition
Other PP-B grades and fills
PP-B is listed in 10 conditions; see the grade overview at PP-B.
Compare all 10 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Expanded (foamed) PP-B bead foam | Choose for energy-absorbing, resilient, low-density cores: automotive bumper cores, packaging, HVAC ducts. | 0.3 | 0.65 | 18 | — |
SHIThis page Super-high-impact / elastomer-modified | Use for -40 °C ductility and no-break notched impact where low stiffness is acceptable. | 16 | 17 | 500 | 55 Shore D |
flame retardant, UL 94 V-0 | Use where UL 94 V-0 at 1.5–3 mm is required in electrical enclosures; impact and colourability suffer. | 20 | 21 | 40 | 70 Shore D |
ESD / conductive | Pick for ESD-safe totes, fuel-handling and electronics packaging needing 10^4–10^9 Ω surface resistivity. | 22 | 23 | 30 | 68 Shore D |
20% talc / mineral filled | Automotive-standard PP-B TD20 for bumpers and interior trim: stiffer, lower shrinkage, impact largely retained. | 23 | 23 | 100 | — |
Heat / long-term thermally stabilized | Choose for hot-air ducts, appliance and under-hood parts needing 1000+ h at 110–120 °C. | 24 | 25 | 300 | 66 Shore D |
40% talc / mineral filled | Choose for maximum dimensional stability, low shrinkage and heat resistance at low cost; impact drops sharply. | — | 25 | 25 | — |
20% coupled glass fiber | Pick when stiffness and creep resistance matter more than impact and low shrinkage is needed. | — | 58 | 4.5 | — |
30% coupled glass fiber | Highest stiffness/strength PP-B compound for load-bearing housings, fan parts and pump bodies. | — | 70 | 3 | 100 HRR |
20% carbon fiber reinforced | Niche compound for light, stiff, partially conductive/antistatic structural parts. | — | 75 | 2.5 | — |
What is PP-B SHI?
PP-B SHI is PP-B in the SHI grade — use for -40 °C ductility and no-break notched impact where low stiffness is acceptable. PP-B SHI has a yield strength of 16 MPa (2.32 ksi) and a tensile strength of 17 MPa (2.47 ksi) — weaker than 83% of polymer grades. Elongation at break is 500% and the elastic modulus is 1.2 GPa (0.174 Msi). PP-B SHI has a density of 0.9 g/cm³ (0.0325 lb/in³), lighter than 82% of polymer grades. Its glass-transition temperature is -12°C (10 °F).
Advantages
- Low embodied carbon — 2 kg CO₂/kg, better than 96% of polymer grades
- Tough — resists crack growth — 4 MPa·√m (3.64 ksi·√in), better than 92% of polymer grades
- Low moisture uptake — 0.02%, better than 92% of polymer grades
- Readily welded — 88/100, better than 91% of polymer grades
- Ductile — tolerates forming and impact — 500%, better than 90% of polymer grades
Limitations
- Low strength — 16 MPa (2.32 ksi), worse than 83% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
PP-B SHI properties
Typical room-temperature values for PP-B SHI; 12 are specific to this condition. Other listed values are PP-B reference data and may not represent this condition. Bars are the position among polymer grades.
Physical6
PP-B SHI has a density of 0.9 g/cm³ (0.0325 lb/in³), lighter than 82% of polymer grades. Its glass-transition temperature is -12°C (10 °F).
Mechanical16
PP-B SHI has a yield strength of 16 MPa (2.32 ksi) and a tensile strength of 17 MPa (2.47 ksi) — weaker than 83% of polymer grades. Elongation at break is 500% and the elastic modulus is 1.2 GPa (0.174 Msi).
Thermal11
PP-B SHI is rated for continuous service to 95°C (203 °F). It conducts heat at 0.21 W/m·K (0.121 BTU/hr·ft·°F), better than 55% of polymer grades. Thermal expansion is 130 µm/m·K (72.2 µin/in·°F).
Electrical7
PP-B SHI is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 82% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PP-B SHI takes about 78 MJ of energy and emits 2 kg of CO₂ — less than 88% of polymer grades. Typical recycled content is 5%.
Manufacturability8
PP-B SHI's machinability is good (60/100, better than 51% of polymer grades); weldability excellent (88/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PP-B SHI
Is PP-B easy to machine?
Machines easily but gummy and elastic: use sharp positive-rake single-flute or O-flute tools, high speed, low feed pressure, air blast — avoid heat build-up and expect spring-back on tight tolerances.
Can PP-B be welded?
Excellent for hot-plate, hot-gas, extrusion, ultrasonic, spin and vibration welding as well as heat staking; no solvent cementing — bonding requires flame/corona/plasma treatment or PP-specific primers with structural adhesive.
Can PP-B be formed, bent or molded?
Easy injection molding at 200–260 °C melt / 20–60 °C mold; shrinkage 1.0–2.5 % is high and anisotropic, so gate for balanced flow, allow uniform walls and hold pressure long enough to avoid voids and sink in thick rubber-rich sections; sheet thermoforms and cold-bends into living hinges.
What surface finishes work on PP-B?
Low-energy waxy surface — paint or metallize only after flame/plasma/corona treatment or with a chlorinated-polyolefin adhesion promoter; texture (mold-etched) finishes hide flow marks better than polished surfaces; not electroplatable without special etch systems.
PP-B 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 |
|---|---|---|
| ethylene (copolymerized, mainly in EPR ptotal ethylene content by 13C-NMR/FTIR | 5 – 15 | 8 |
| ethylene-propylene rubber (EPR) dispersereactor-made rubber domains, xylene-soluble fraction | 10 – 25 | 16 |
| stabilizers / antioxidants / acid scavenhindered phenol + phosphite + Ca/Zn stearate | 0.05 – 0.5 | 0.2 |
| nucleating agent, antistat, slip (optiongrade dependent | 0 – 0.5 | 0.1 |
| propylene (C3H6 repeat unit)isotactic PP matrix | ≥ 78 (balance) | — |
PP-B SHI — frequently asked
What is PP-B SHI used for?
PP-B SHI is typically used for automotive bumpers and interior trim, appliance housings, battery cases, industrial totes and crates and cold-chain containers. In short: toughest unfilled PP; best low-temperature impact PP; low-cost impact housings.
What is the yield strength of PP-B SHI?
PP-B SHI has a typical yield strength of 16 MPa (2.32 ksi) and a tensile strength of 17 MPa (2.47 ksi) — weaker than 83% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is PP-B SHI easy to machine?
Reasonably — machinability is rated good (60/100, better than 51% of polymer grades). Machines easily but gummy and elastic: use sharp positive-rake single-flute or O-flute tools, high speed, low feed pressure, air blast — avoid heat build-up and expect spring-back on tight tolerances.
Can PP-B SHI be welded?
Yes — weldability is rated excellent (88/100). Excellent for hot-plate, hot-gas, extrusion, ultrasonic, spin and vibration welding as well as heat staking; no solvent cementing — bonding requires flame/corona/plasma treatment or PP-specific primers with structural adhesive.
What surface finishes work on PP-B SHI?
Low-energy waxy surface — paint or metallize only after flame/plasma/corona treatment or with a chlorinated-polyolefin adhesion promoter; texture (mold-etched) finishes hide flow marks better than polished surfaces; not electroplatable without special etch systems.
Can PP-B SHI be formed, bent or molded?
Easy injection molding at 200–260 °C melt / 20–60 °C mold; shrinkage 1.0–2.5 % is high and anisotropic, so gate for balanced flow, allow uniform walls and hold pressure long enough to avoid voids and sink in thick rubber-rich sections; sheet thermoforms and cold-bends into living hinges.
What is the maximum service temperature of PP-B SHI?
PP-B SHI is rated for continuous use to about 95°C (203 °F), and briefly to 120°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ISO 1873-1 Plastics — Polypropylene (PP) moulding and extrusion materials — Designation system — ISO (2016)
- GB/T 12670 PP (2008)
- ASTM D4101 Standard Specification for Polypropylene Injection and Extrusion Materials — ASTM International (2023)
- JIS K6921-1/-2 Plastics — Polypropylene (PP) moulding and extrusion materials — JSA (2019)
- CAMPUS plastics database — PP block copolymer grades — CWFG / CAMPUS consortium (2025)
- Moplen EP impact copolymer datasheets — LyondellBasell (2024)
- Borealis / Borouge PP block copolymer and TD-filled compound datasheets — Borealis (2024)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
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.