PPH
PPH
Polypropylene Homopolymer
Polypropylene Homopolymer
Polypropylene Homopolymer (PPH) is a versatile, semi-crystalline, rigid thermoplastic polymer. Unlike its copolymer counterparts (PPC), PPH is made purely from propylene monomers, resulting in a stiffer material with higher temperature resistance.
PPH is recognised as the most widely used grade of polypropylene, characterised by high stiffness, high strength-to-weight ratio, and excellent chemical resistance. PPH is often used in industrial engineering applications, particularly in corrosive environments, as well as in consumer packaging.
Key Properties
Mechanical & Physical
- High Rigidity
Superior stiffness compared to other polypropylene grades. - Chemical Inertness
Excellent resistance to most acids, alkalis, and organic solvents. - High Melting Point
Typically higher than copolymers, allowing for use in hot-fill applications. - Low Moisture Absorption
Maintains dimensional stability in humid environments.
Chemical & Thermal
- Stress Crack Resistance
Highly resistant to environmental stress cracking. - Excellent Dielectric Properties
Acts as a high-quality electrical insulator. - Food Grade
Naturally BPA-free and widely compliant with global food contact regulations. - Low Density
One of the lightest engineering thermoplastics, reducing final part weight.
COMMON APPLICATIONS
Technical Details
| TEST METHOD | VALUE | VALUE (IMPERIAL) | |
|---|---|---|---|
| PHYSICAL PROPERTIES | |||
| Density | ISO 1183 | 0.905 g/cm³ | 0.0327 lb/in³ |
| Water Absorption (24h) | ISO 62 | 0.01% | 0.01% |
| Water Absorption (Saturation) | ISO 62 | <0.1% | <0.1% |
| MECHANICAL PROPERTIES | |||
| Tensile Strength at Yield | ISO 527 | 35 MPa | 5,076 psi |
| Tensile Modulus of Elasticity | ISO 527 | 1,500 MPa | 217.6 ksi |
| Elongation at Yield | ISO 527 | 10% | 10% |
| Elongation at Break | ISO 527 | >50% | >50% |
| Flexural Strength | ISO 178 | 45 MPa | 6,526 psi |
| Flexural Modulus | ISO 178 | 1,450 MPa | 210.3 ksi |
| Charpy Impact (Notched) | ISO 179 | 4.0 kJ/m² | 1.9 ft-lb/in² |
| Rockwell Hardness | ISO 2039-2 | R 95 | R 95 |
| THERMAL PROPERTIES | |||
| Melting Temperature | DSC | 165°C | 329°F |
| Heat Deflection Temp (1.8 MPa) | ISO 75 | 105°C | 221°F |
| Max. Service Temp (Long Term) | 100°C | 212°F | |
| Min. Service Temp | 0°C | 32°F | |
| Thermal expansion (CLTE) | ISO 11359 | 150 x 10⁻⁶/K | 8.3 x 10⁻5 in/in/°F |
| Thermal Conductivity | 0.22 W/(m·K) | 1.53 BTU·in/(hr·ft²·°F) | |
| Flammability Rating | UL 94 | HB | HB |
| ELECTRICAL PROPERTIES | |||
| Dielectric Strength | IEC 60243 | 45 kV/mm | |
| Volume Resistivity | IEC 60093 | 10¹⁶ Ω·cm | |
| Surface Resistivity | IEC 60093 | 10¹⁴ Ω | |
| Dielectric Constant (1 MHz) | IEC 60250 | 2.3 | |
| Dissipation Factor (1 MHz) | IEC 60250 | 0.0002 |
These values are typical average values and should be used for material selection and design guidance only.
Technical Details
| TEST METHOD | VALUE | |
|---|---|---|
| PHYSICAL PROPERTIES | ||
| Density | ISO 1183 | 0.905 g/cm³ |
| Water Absorption (24h) | ISO 62 | 0.01% |
| Water Absorption (Saturation) | ISO 62 | <0.1% |
| MECHANICAL PROPERTIES | ||
| Tensile Strength at Yield | ISO 527 | 35 MPa |
| Tensile Modulus of Elasticity | ISO 527 | 1,500 MPa |
| Elongation at Yield | ISO 527 | 10% |
| Elongation at Break | ISO 527 | >50% |
| Flexural Strength | ISO 178 | 45 MPa |
| Flexural Modulus | ISO 178 | 1,450 MPa |
| Charpy Impact (Notched) | ISO 179 | 4 kJ/m² |
| Rockwell Hardness | ISO 2039-2 | R95 |
| THERMAL PROPERTIES | ||
| Melting Temperature | DSC | 165°C |
| Heat Deflection Temp (1.8 MPa) | ISO 75 | 105°C |
| Max. Service Temp (Long Term) | 100°C | |
| Min. Service Temp | 0°C | |
| Thermal expansion (CLTE) | ISO 11359 | 150 x 10⁻⁶/K |
| Thermal Conductivity | 0.22 W/(m·K) | |
| Flammability Rating | UL 94 | HB |
| ELECTRICAL PROPERTIES | ||
| Dielectric Strength | IEC 60243 | 45 kV/mm |
| Volume Resistivity | IEC 60093 | 10¹⁶ Ω·cm |
| Surface Resistivity | IEC 60093 | 10¹⁴ Ω |
| Dielectric Constant (1 MHz) | IEC 60250 | 2.3 |
| Dissipation Factor (1 MHz) | IEC 60250 | 0.0002 |
These values are typical average values and should be used for material selection and design guidance only.
CHEMICAL RESISTANCE
| CATEGORY | REPRESENTATIVE SUBSTANCE | RATING | NOTES |
|---|---|---|---|
| Acids (Weak) | Acetic Acid | A | Stable at room temperature. |
| Acids (Strong) | Sulphuric Acid (98%) | B | Slight oxidation at elevated temperatures. |
| Alcohols | Ethanol / Isopropanol | A | Excellent resistance. |
| Alkalis (Bases) | Sodium Hydroxide | A | Highly resistant to caustic solutions. |
| Aromatic Hydrocarbons | Benzene / Toluene | C | Causes significant swelling and softening. |
| Chlorinated Solvents | Chloroform | C | Material degradation and absorption. |
| Fuels | Petrol, Diesel | B | Limited contact permissible, potential swelling. |
| Ketones | Acetone | A | Generally very good resistance. |
| Oxidizing Agents | Hydrogen Peroxide | B | May cause surface embrittlement over time. |
| Water / Steam | Water / Steam | A | Hydrolytically stable, steam resistant to 100°C. |
RATING SCALE:
A (Excellent): Little to no effect.
B (Good/Fair): Minor swelling or slight changes in properties; acceptable for short-term exposure.
C (Poor): Severe degradation or stress cracking. Not recommended.
CHEMICAL RESISTANCE
| CATEGORY | EXAMPLE | RATING |
|---|---|---|
| Acids (Weak) | Acetic Acid | A |
| Acids (Strong) | Sulphuric Acid (98%) | B |
| Alcohols | Ethanol / Isopropanol | A |
| Alkalis (Bases) | Sodium Hydroxide | A |
| Aromatic Hydrocarbons | Benzene / Toluene | C |
| Chlorinated Solvents | Chloroform | C |
| Fuels | Petrol, Diesel | B |
| Ketones | Acetone | A |
| Oxidizing Agents | Hydrogen Peroxide | B |
| Water / Steam | Water / Steam | A |
RATING SCALE:
A (Excellent): Little to no effect.
B (Good/Fair): Minor swelling or slight changes in properties; acceptable for short-term exposure.
C (Poor): Severe degradation or stress cracking. Not recommended.
FAQ
SERVICES
Plastock has extensive experience in all cutting, laser and manufacturing techniques across a huge range of industries and materials using the latest technologies. With expert engineering knowledge and world class equipment, we can help with the design, development, fabrication and installation or your project. No job is too big or too small.
SERVICES
Plastock has extensive experience in all cutting, laser and manufacturing techniques across a huge range of industries and materials using the latest technologies. With expert engineering knowledge and world class equipment, we can help with the design, development, fabrication and installation or your project. No job is too big or too small.
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