CPVC vs PVDC
Polymer · grade comparison
CPVC and PVDC are both polymer grades. CPVC is the stronger of the two: yield strength 52 MPa (7.54 ksi) against 18 MPa (2.61 ksi) for PVDC, about 189% more; tensile strength follows at 55 MPa (7.98 ksi) vs 34 MPa (4.93 ksi). In exchange, PVDC is the more ductile: elongation 80% versus 25% for CPVC, and CPVC is harder (82 Shore D vs 65 Shore D). CPVC is lighter (1.54 g/cm³ vs 1.68 g/cm³ for PVDC) and CPVC is stiffer (3 GPa vs 0.5 GPa). On the shop floor, CPVC machines more easily (very good vs poor), PVDC welds better (excellent vs good), and CPVC sits in a lower cost tier (standard, $$) than PVDC (premium, $$$).
CPVCChoose it when strength drives the design, or when weight is the constraint.
PVDCChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
CPVC vs PVDC: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell R
Bulk Modulus
Tear Strength
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Melting Temperature (Tm)
Light Transmission
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Max Service Temperature (short-term)
Same in both: Limiting Oxygen Index 60%
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Volume Resistivity
Comparative Tracking Index (CTI)
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Mold Shrinkage
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Same in both: Thermal Diffusivity 0.1 mm²/s · Thermal Shock Resistance Index 0
Strength versus weight
Yield strength against density for every polymer grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | CPVC | PVDC |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Injection molding | Yes | — |
| Default condition | Unfilled | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | 0.5 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Chrome Plating (Plastic) | Yes | — |
| EMI Shielding Coating | Yes | — |
| Painting | Yes | — |
| Soft Touch Coating | Yes | — |
| Spray Painting | Yes | — |
| UV Coating | Yes | — |
CPVC vs PVDC — frequently asked
Is CPVC stronger than PVDC?
Yes. CPVC has a typical yield strength of 52 MPa (7.54 ksi) against 18 MPa (2.61 ksi) for PVDC — about 189% more. Tensile strength is 55 MPa (7.98 ksi) vs 34 MPa (4.93 ksi).
Which is cheaper, CPVC or PVDC?
CPVC is the lower-cost material: it sits in the standard tier ($$) while PVDC is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, CPVC or PVDC?
CPVC. Its machinability rates very good (75/100) against poor (30/100) for PVDC; for welding the order is PVDC first (excellent, 85/100) then CPVC (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in CPVC and PVDC side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.