PVC-U (Rigid PVC) vs PP-H (Polypropylene Homopolymer): Both low-cost plastics — PVC-U stiffer and flame-resistant, PP-H lighter and chemically superior
PVC-U (Rigid PVC) vs PP-H (Polypropylene Homopolymer)
Side-by-side chemical composition and mechanical property comparison.
Overview
PVC-U (Rigid PVC)
Unplasticized Polyvinyl Chloride — the second-most produced plastic globally. Hard, rigid, self-extinguishing (LOI 45%), excellent chemical resistance to acids/bases/salts, and very low cost. Key limitation: max service temp only 60°C. Developed in 1930s Germany. Used for water/sewage pipes, window profiles, electrical conduit, cladding, and chemical tanks/fittings. NOT the flexible PVC used in cables — that is PVC-P (plasticized).
PP-H (Polypropylene Homopolymer)
Polypropylene Homopolymer — the lightest common engineering plastic (0.905 g/cm³). Excellent chemical resistance (esp. to acids and bases), good fatigue resistance (integral living hinges), and low moisture absorption. Becomes brittle below 0°C. Used for chemical tanks, HVAC ducts, pump housings, food containers, automotive battery cases, and medical lab equipment.
| PVC-U (Rigid PVC) | PP-H (Polypropylene Homopolymer) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 10350 | ISO 10350 |
Mechanical properties
| Property | PVC-U (Rigid PVC) | PP-H (Polypropylene Homopolymer) | Unit |
|---|---|---|---|
| tensile_strength | 48–55 | 30–36 | MPa |
| yield_strength | 48–55 | 30–36 | MPa |
| elongation | 30–50 | 70–200 | % |
Compatibility Assessment
PVC-U has higher stiffness (E-Mod 3.0 vs 1.5 GPa), is self-extinguishing (LOI 45%), and costs less. PP-H is lighter (0.91 vs 1.40 g/cm³), withstands higher temps (100 vs 60°C), and resists more chemicals (esp. acids). Choose PVC-U for pipes/profiles at room temp; PP-H for chemical tanks and higher temp.
Frequently Asked Questions
Is PVC-U (Rigid PVC) the same as PP-H (Polypropylene Homopolymer)?
PVC-U (Rigid PVC) and PP-H (Polypropylene Homopolymer) have a 40% composition overlap. Both low-cost plastics — PVC-U stiffer and flame-resistant, PP-H lighter and chemically superior
Can I replace PVC-U (Rigid PVC) with PP-H (Polypropylene Homopolymer)?
Generally not recommended. The compositions differ significantly (40% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between PVC-U (Rigid PVC) and PP-H (Polypropylene Homopolymer)?
The main differences are in the following elements: overall alloying content. PVC-U (Rigid PVC) is a Polymers grade, while PP-H (Polypropylene Homopolymer) is a Polymers grade.
Related Comparisons
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