PP-B
A rubber-toughened PP produced by reactor blending of ethylene-propylene rubber domains into the PP matrix, giving markedly higher low-temperature impact strength than standard copolymer/homopolymer grades; used where drop/impact performance is critical.
Reference datasheet — PP-B is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
PP-B grades and fills
PP-B is supplied in 10 conditions, soft to hard.
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 | |
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 |
Supply forms, finishes and certifications
Ways PP-B is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FDA | FDA / EU food-contact & medical grade | Certification |
UV | UV / weathering stabilized | Grade option |
UnfilledDefault | Unfilled / natural impact copolymer | Standard supply |
What is PP-B?
A rubber-toughened PP produced by reactor blending of ethylene-propylene rubber domains into the PP matrix, giving markedly higher low-temperature impact strength than standard copolymer/homopolymer grades; used where drop/impact performance is critical. PP-B has a density of 0.91 g/cm³ (0.0327 lb/in³), lighter than 81% of polymer grades. Its glass-transition temperature is -12°C (10 °F). PP-B has a yield strength of 24 MPa (3.48 ksi) and a tensile strength of 25 MPa (3.63 ksi) — weaker than 76% of polymer grades. Elongation at break is 350% and the elastic modulus is 1.2 GPa (0.174 Msi).
What is PP-B used for?
- Automotive bumpers and interior trim
- Appliance housings
- Battery cases
- Industrial totes and crates
- Cold-chain containers
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 — 350%, better than 84% of polymer grades
Limitations
- Low strength — 24 MPa (3.48 ksi), worse than 76% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
PP-B properties
Typical room-temperature values; bars are the position among polymer grades.
Physical6
PP-B has a density of 0.91 g/cm³ (0.0327 lb/in³), lighter than 81% of polymer grades. Its glass-transition temperature is -12°C (10 °F).
Mechanical16
PP-B has a yield strength of 24 MPa (3.48 ksi) and a tensile strength of 25 MPa (3.63 ksi) — weaker than 76% of polymer grades. Elongation at break is 350% and the elastic modulus is 1.2 GPa (0.174 Msi).
Thermal11
PP-B 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 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 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's machinability is good (60/100, better than 51% of polymer grades); weldability excellent (88/100); formability very good (75/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. PP-B is highlighted; hover a dot for its name, or open the interactive family chart.
Working with PP-B
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.
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) |
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.
How much does PP-B cost?
PP-B is a budget-cost polymer ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
PP-B — frequently asked
What is PP-B used for?
PP-B 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?
PP-B has a typical yield strength of 24 MPa (3.48 ksi) and a tensile strength of 25 MPa (3.63 ksi) — weaker than 76% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is PP-B 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 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?
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 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?
PP-B 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.
How much does PP-B cost?
PP-B is a budget-cost polymer ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.