Pressure-Volume-Temperature (PVT) Testing Lab
- PVT isothermal-heating, isobaric, volumetric-expansion, high-rate PVT, and solid-state-compressibility programs
- Method-appropriate temperature-pressure matrices, sample preparation, and reference density measurement
- Solid- and melt-phase characterization, cooling-rate-adjusted PVT, and pressure-dependent compressibility testing
- Comparative or CAE / injection-molding-input-focused programs
- Engineering test report (PDF) with digital data delivery
- Method-appropriate outputs such as specific volume vs. pressure, specific volume vs. temperature, coefficient of volumetric thermal expansion (CVTE), volumetric strain vs. pressure, and solid density reference data
- Raw data exports available on request, where applicable
- Exact deliverables depend on the selected PVT method, temperature-pressure program, and sample configuration
Get Started
Tell us about the material, application, environment, and any method, standard, specimen, or conditioning constraints.
We’ll align the appropriate method, specimen requirements, and deliverables to your objectives, then provide a quote and test plan.
Send the purchase order and arrange delivery of materials or specimens so the program can move into scheduling and execution.
You’ll receive an engineering test report with digital data delivery, along with any agreed raw data or method-appropriate outputs.
FAQs
It depends on the selected PVT method, material type, and program design. Share what you have and we’ll confirm the suitable sample form, quantity, and preparation needs before quoting.
PVT testing measures volume response under controlled temperature and pressure using high-pressure dilatometry. Depending on the program, outputs may be captured as specific volume vs. pressure, specific volume vs. temperature, CVTE, or volumetric strain vs. pressure.
We support DatapointLabs DPL D-020, DPL D-023, and DPL M-213 PVT-related methods, with ASTM D792 used for reference density where applicable.
Yes—where applicable, programs can include isothermal-heating PVT, isobaric PVT, volumetric expansion coefficient by PVT, high-rate PVT by hybrid PVT/DSC, and solid-state compressibility testing.
You receive an engineering test report (PDF) and digital data deliverables. Raw data exports are available on request where applicable. Exact outputs depend on the selected PVT program and method.
Reported outputs depend on the method. Common outputs include specific volume vs. temperature, specific volume vs. pressure, coefficient of volumetric thermal expansion (CVTE), volumetric strain vs. pressure, and solid density reference data.
Typical turnaround for most testing is five business days, but timing can vary based on sample preparation, drying needs, temperature-pressure matrix, and program complexity—share constraints and we’ll propose a viable plan.
Tell us what you need back—specific-volume data, CVTE, compressibility response, raw data, reporting format, and any modeling inputs or required method. We’ll align the program and deliverables before testing begins.
The sections below provide the technical context, standards, specimen considerations, test procedures, and measurement details for this testing service.
Significance & Purpose
Pressure-Volume-Temperature (PVT) Testing is crucial for understanding the volumetric behavior of materials under varying pressure, temperature, and thermal expansion conditions. PVT data provides essential inputs for injection molding simulations, finite element analysis (FEA), material modeling, and product design.
The primary objectives of PVT testing include:
- Material Behavior Characterization: Understanding volumetric expansion, shrinkage, and compressibility.
- Thermal Stress Analysis: Identifying potential failures due to thermal stresses in multi-material systems.
- Injection Molding Simulation: PVT data is essential for predicting part shrinkage, warpage, and post-filling behavior.
Standards
Plastics & Thermosets
- DPL D-020: PVT Testing (Isothermal Heating, Isobaric, and Volumetric Expansion Coefficient).
- DPL D-023: High-Rate PVT by Hybrid PVT/DSC.
- DPL M-213: Solid-State Compressibility (PVT).
- ASTM D792: Solid Density Measurement (reference for baseline PVT data).
Tests
Tests in the DatapointLabs test catalog that reference pressure-volume-temperature (PVT) testing are as follows:
Plastics & Thermosets
| Test ID | Test Description | Standards |
|---|---|---|
| D-020 | PVT (Isothermal Heating) | DPL D-020* |
| D-021 | PVT (Isobaric) | DPL D-020* |
| D-022 | Volumetric Expansion Coefficient by PVT | DPL D-020* |
| D-023 | High Rate PVT by Hybrid PVT/DSC | DPL D-023* |
| D-024 | Solid State Compressibility (PVT) | DPL M-213* |
* Internal DatapointLabs Standard
Principle of Operation
PVT testing examines the relationship between pressure, volume, and temperature to characterize material compressibility and thermal expansion. The test uses an indirect dilatometry method (confining fluid method), where the sample is sealed with mercury in a vacuum-filled cell. The linear displacement of a bellows spring, measured with an LVDT (Linear Variable Differential Transformer), enables the volume change.
Key measurements are as follows:
- Specific Volume: The inverse of density.
- Volumetric Thermal Expansion Coefficient (CVTE): Describes how volume changes with temperature.
- Volumetric Strain: Relative change in volume under pressure.
Typical Procedure
PVT (Isothermal Heating)
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Sample Preparation:
- Dry approximately 1 gram of the sample.
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Loading the Sample:
- Place the sample in the PVT apparatus and seal it with mercury.
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Test Execution:
- Start at ambient temperature (30°C).
- Apply pressure from 10 MPa to 200 MPa while measuring volume.
- Repeat for increasing temperature steps until the processing temperature is reached.
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Data Collection:
- Measure specific volume vs. pressure.
PVT (Isobaric)
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Sample Preparation:
- Dry approximately 1 gram of the sample.
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Loading and Heating:
- Heat the sample to the processing temperature.
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Test Execution:
- Maintain a constant pressure while cooling the sample to 50°C.
- Perform tests at up to 4 pressure levels.
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Data Collection:
- Record specific volume vs. temperature.
Volumetric Expansion Coefficient by PVT
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Sample Preparation:
- Dry and load 1 gram of sample.
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Test Execution:
- Conduct isothermal heating from ambient to processing temperature.
- Apply pressures from 10 MPa to 200 MPa.
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Data Collection:
- Calculate Coefficient of Volumetric Thermal Expansion (CVTE) for both solid and melt phases.
High-Rate PVT by Hybrid PVT/DSC
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Sample Preparation:
- Load 1 gram of the sample.
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Test Execution:
- Run a slow PVT test and adjust results using DSC transition data.
- Mimics cooling rates observed in injection molding.
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Data Collection:
- Record specific volume vs. temperature.
Solid-State Compressibility
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Sample Preparation:
- Dry and load 1 gram of sample.
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Test Execution:
- Perform isothermal heating while applying pressure from 10 MPa to 200 MPa.
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Data Collection:
- Record volumetric strain vs. pressure.
Specimen Types
Specimens used by DatapointLabs in PVT testing are as follows:
| Specimen Type | DatapointLabs Test IDs |
|---|---|
| Parts, Any Shape [Details] | D-020, D-021, D-022, D-023, D-024 |
Characterization Measurements
PVT (Isothermal Heating)
- Solid Density: Baseline density at room temperature.
- Specific Volume vs. Pressure: Inverse of density as a function of pressure.
PVT (Isobaric)
- Solid Density: Baseline density at room temperature.
- Specific Volume vs. Temperature: Inverse of density as a function of temperature.
Volumetric Expansion Coefficient by PVT
- Coefficient of Volumetric Thermal Expansion (CVTE): Linear relationship between volume and temperature, in the solid and melt phases.
- Solid Density: Mass per unit volume of the solid material.
- Specific Volume vs. Temperature: Inverse of density as a function of temperature.
High-Rate PVT by Hybrid PVT/DSC
- Solid Density: Baseline density at room temperature.
- Specific Volume vs. Temperature: Inverse of density as a function of temperature (adjusted for high cooling rates).
Solid-State Compressibility
- Volumetric Strain vs. Pressure: Relative change in volume as a function of pressure for material under pressure.
Typical Data Reported
- Specific Volume vs. Temperature: Solid and melt phase behavior.
- Specific Volume vs. Pressure: Material compressibility characteristics.
- Coefficient of Volumetric Thermal Expansion (CVTE): For solid and melt phases.
- Volumetric Strain vs. Pressure: Solid-state compressibility.
- Volumetric Stress vs. Strain: High-pressure deformation behavior.
- Solid Density: Reference measurement using ASTM D792.
Suitable Material Types
- Thermoplastics: PE, PP, PC, PA, PET, PBT.
- Thermosets: Epoxies, polyurethanes, phenolics.
- Composites: Fiber-reinforced polymers (FRPs).
- Elastomers: TPU, TPE, rubber materials.
Suitable Applications
- Injection Molding Simulation: Predicting shrinkage and warpage.
- Hyperelastic Material Modeling: Solid-state compressibility data for confined materials.
- Thermal Stress Analysis: Assessing multi-material assemblies.
- Additive Manufacturing: Modeling polymer behavior under thermal gradients.
- Automotive Components: Simulating part deformation under dynamic loads.
- Aerospace Materials: Evaluating thermal expansion and compressibility.
Conclusion
Pressure-volume-temperature (PVT) testing provides critical insights into material behavior under varying thermal and pressure conditions. By utilizing methods such as isothermal heating, isobaric cooling, volumetric expansion, high-rate PVT, and solid-state compressibility, engineers can accurately model and predict volumetric shrinkage, thermal stresses, and compressibility in plastics and thermosets. These insights are essential for injection molding, thermal management, impact analysis, and multi-material design across industries such as automotive, aerospace, and consumer electronics.
