Aerosol Science

Spray Pattern & Plume Geometry Testing

Plume angle, spray pattern, and shape measurements for nasal sprays, oral sprays, and pressurized aerosols, supporting submissions or rapid development.

Laser-sheet imaging on a controlled actuation rig, with LaVision analysis, produces plume geometry and spray pattern datasets traceable to each replicate and aligned to FDA nasal-spray guidance.

ISO 17025FDA nasal / oral sprayUSP <601>ICH Q9Reviewed 2026-10-20
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Purpose & when to use

Spray Pattern and Plume Geometry (SP / PG) testing measures how an atomized spray expands in air and deposits on a target: plume angle, width, and pattern diameter for nasal sprays, oral sprays, and pressurized consumer aerosols. Laser-sheet imaging and LaVision analysis support applicable FDA nasal-spray guidance; USP <601> provides separate dose-delivery and particle-size performance context. The same fixtures support development screening and root-cause work. SP / PG testing supports:

  1. FDA-aligned nasal spray submission packages — plume geometry at protocol-defined elapsed times and spray pattern at selected target distances, with the applicable FDA product guidance identified.
  2. Device-change comparisons for nasal pumps, oral spray valves, and aerosol actuators use defined replicates and criteria; FDA guidance is chosen for the applicable product.
  3. Robustness mapping across actuation force, fill level, viscosity, and temperature for consumer aerosols and pump sprays uses a defined imaging protocol; EPA claim-support requirements are assessed for the applicable product.
  4. Root-cause investigation of asymmetric sprays, plume tailing, intermittent actuation, and pattern drift across canister life — pairs with high-speed imaging under FDA inspection-readiness and ICH Q9 quality-risk principles.
  5. Pump and valve development DOE studies on nozzle geometry, swirl chamber, and metering tweaks — fast iteration on the same fixtures that anchor submission work under FDA development-stage CMC guidance.

Use SP / PG testing when emitted spray geometry informs regulatory questions about local deposition for nasal-spray bioavailability, consumer-spray coverage uniformity, or sensitivity to formulation and actuation conditions. Imaging data are traceable to a defined fixture, distance, and image-quality acceptance criteria; they do not alone establish regional nasal deposition.

Built for sprays, nasal devices, and pressurized aerosols

Spray pattern and plume geometry characterization spans the device classes that put atomized formulations into the air — pharmaceutical, consumer, and industrial spray products under one analytical roof.

  • Nasal sprayIntranasal pumps and devices
  • Oral spraySublingual and topical-oral
  • Pressurized aerosolPropellant-driven cans
  • Pump sprayMechanical pump bottles
  • Consumer aerosolSprays · fogs · misters

Instrumentation & measurement ranges

We choose the imaging configuration based on the device and the decision the data need to support. Fixtures for submission studies and development screening share a measurement basis.

10 – 200 mmoptical

Laser-sheet / planar illumination imaging

Thin planar illumination of the spray cross-section at controlled standoff distances — the regulator-aligned basis for plume angle and width. Synchronization with actuation captures the plume within milliseconds of fire.

1 – 1000 mstime-window

Plume Master actuation rig (in-house)

Custom in-house actuation fixture with stepper-driven force, displacement, and timing control — repeatable shot-to-shot capture for plume geometry datasets across single-actuation and full-canister studies.

30 – 60 mmcapture-distance

LaVision DaVis image-analysis software

Quantitative extraction of plume boundary, plume angle, pattern diameter, area, ellipticity, and circularity — calibrated pixel-to-mm scaling with documented acceptance criteria for focus and saturation.

0.1 – 980 µmdiffractive

Malvern Spraytec (paired droplet sizing)

Volume-weighted droplet spectra running alongside SP / PG when the program needs droplet-size and plume-geometry data on a matched set of actuations — pairs the two attributes on a single canister.

Test method options

MethodStrengthsTradeoffAligned with
Regulator-aligned nasal / oral spray SP-PG (submission package)
  • Timed plume geometry and spray pattern at protocol-selected distances with controlled actuation — the canonical ANDA / NDA submission package.
  • Replicates at beginning, middle, and end of canister with documented acceptance criteria — submission-ready figures and statistics out of the box.
More fixture setup and image-acceptance overhead than screening — best when the device is locked and the data is filing-bound.
FDA nasal / oral sprayUSP <601>
Development screening for pump / nozzle / valve iteration
  • Fast feedback for design changes — same fixtures as the submission method, but reduced replicates and acceptance bands tuned for iteration.
  • Supports DOE sweeps across nozzle geometry, swirl chamber, valve metering, and viscosity to map each variable's effect on plume and pattern.
Not sufficient on its own for formal comparability without added replicates and controls; bridge to the submission method before filing.—
Robustness mapping across actuation and environment
  • Surfaces the use-condition envelope across actuation force, fill level, viscosity, and temperature where plume and pattern stay in spec.
  • Output feeds change-control packages and predicate comparisons under FDA nasal / oral spray framing when product variations are assessed.
More conditions per study increase sample count and analysis time — scope tightly to the variables that drive the decision.
FDA nasal / oral spray
Failure investigation (asymmetry · tailing · intermittent spray)
  • Targets root causes of sprayability defects with iterative fixture work — pairs naturally with high-speed imaging for time-resolved diagnostics.
  • Documented under ICH Q9 quality-risk framing so the investigation output supports CAPA packages and inspection-readiness narratives.
Often needs iterative fixture and acceptance-criteria tweaks — schedule unpredictability is higher than a fixed-protocol study; budget two or three rounds.
ICH Q9
Paired SP-PG plus droplet sizing (Malvern Spraytec)
  • Paired plume, pattern, and droplet-size measurements characterize spray performance; they do not alone establish regional nasal deposition.
  • Combined imaging and droplet-size data can support product comparisons and engineering review when the applicable study plan calls for these endpoints.
Higher instrumentation and analyst overhead per condition — reserve for programs where the combined dataset materially changes the submission strategy.
FDA nasal / oral sprayUSP <601>

Setup configurations

We configure each spray-pattern study around the device, its use conditions, and the decision the data need to support. The setup balances the controls needed for submission work - actuation, distance, and image acceptance - with how the device operates. We define the settings below during study planning to keep plume and pattern data interpretable and defensible:

Device interfaces

Adapters for nasal pumps, oral spray valves, pressurized canisters, pump bottles, and consumer triggers — geometry and orientation matched to the device under test and the regulatory question.

Flow & actuation profiles

Stepper-controlled force, displacement, velocity, and dwell — manual, pneumatic, or mechanical fixtures sized to mimic patient or operator use conditions with shot-to-shot repeatability.

Sample numbers

Device count, actuations per device, life stages, and replicate count per condition are defined from applicable product guidance, expected variability, and the study precision or comparison objective.

Environmental controls

Temperature and humidity controlled and logged where viscosity, propellant, or actuator response is sensitive — environment recorded alongside each capture in the chain of custody.

Calibration & verification

Pixel-to-mm scaling, laser sheet alignment, and actuation force / displacement verified against traceable standards before each campaign and re-verified between condition blocks.

Methods anchored to the standards that matter

ARE Labs is ISO/IEC 17025-accredited for its current testing scope. FDA and USP references apply to relevant drug products; consumer-spray imaging uses a separately defined protocol. The study report identifies method alignment, adaptations, and any non-accredited results.

  • ISO 17025AccreditedTesting-laboratory competence — documented methods, calibration traceability, and uncertainty contributors.
  • FDA nasal / oral sprayAlignedBioequivalence and CMC framing for nasal and oral spray submissions.
  • USP <601>AlignedAerosols, nasal sprays, MDIs, and DPIs — performance quality tests.
  • ICH Q9AlignedQuality risk management for applicable pharmaceutical development and investigation decisions.

Key data outputs & reporting

Each spray-pattern study reports plume angle and width versus distance, plus spray pattern diameter, area, circularity, and ellipticity. The package includes qualitative uniformity flags, replicate summary statistics, traceable QA / QC controls, and underlying images. These data are formatted for regulatory submissions, change-control packages, or design iteration. The deliverables below cover the standard SP / PG report; comparability, predicate studies, and full canister-life mapping receive an extended package with the artifacts listed beneath the table.

Primary outputs

  • Plume angle and plume width versus capture distance with shot-to-shot replicate statistics (mean, SD, CV per condition).
  • Spray pattern diameter, area, ovality / ellipticity, circularity, and qualitative uniformity indicators on a defined target plane.
  • Annotated overlays comparing lots, devices, actuation conditions, or beginning-middle-end canister positions against predicate, control, or specification baselines.

Deliverables

#FormatContents
01PDF reportMethods, fixtures, acceptance criteria, and results tables.
02CSV / XLSX datasetsPlume and pattern metrics with replicate statistics.
03Annotated images and clipsLaser-sheet captures and side-by-side overlays for internal reviews and submission appendices.
Extended deliverables · multi-arm comparability · stability · predicate studies
  • Comparability appendix — Side-by-side plume / pattern overlays with protocol-defined statistical comparisons and product-specific comparator or predicate framing.
  • Canister-life mapping pack — Plume and pattern trends across beginning-middle-end actuation positions with predefined acceptance bands flagged.
  • Method-development notes — Documentation of fixture-selection rationale, image acceptance criteria, and uncertainty contributors — for submission cover letters and inspection readiness.

QA / QC & data integrity

Spray-pattern QA / QC controls cover optical calibration, actuation settings, capture distance and timing, image quality, and analysis checks defined in the method plan. We review these records under our ISO 17025 quality system, maintaining traceability from sample receipt through the final result. Any additional chemical or microbiological assay is scoped separately.

Image calibration checks for pixel-to-mm scale, laser sheet alignment, and background subtraction before each capture block.

Replicate actuations and repeat runs to quantify variability across canister position, devices, and lots.

Defined acceptance criteria for image focus, saturation, plume boundary definition, and background contrast at the capture distance.

Actuation force, displacement, and distance verification logs alongside captured images and analyzed metrics.

Chain of custody from sample receipt through image acquisition, analysis exports, and final reporting.

RESEARCH / THIS WORK IN PRACTICE

Real studies. Measured evidence.

Explore published studies connected to spray pattern and plume geometry. Each explains the study question, approach and findings.

View related studies (1)
Inhalation & Drug Delivery

Dry-Powder Nasal Spray Testing: Phase 1 Characterization

The study established an early performance baseline for comparing the two variants and provided data for a regulatory-facing Phase 1 characterization package. It did not assess clinical efficacy or support claims of approval.

Selected finding
Recovered material was predominantly classified in the nasal or upper-airway region for both variants.
Nasal deliveryParticle sizingDevice evaluation

Study-specific findings do not guarantee performance for another product.

Why ARE Labs

ARE Labs connects technical topics to practical study design, method selection, controlled aerosol work, and reportable evidence without turning technical pages into sales pages.

Reviewed byJamie Balarashti (25 yrs - cascade & inhalation methods) - Weston Schaper (7 yrs - real-time sizing & nanoparticle work)
17025Accredited laboratory
900+Studies Performed
17+Years in operation
300+Clients supported

Common questions

These answers cover method selection, actuation control, replicate counts, comparability, and deliverables for nasal-spray, consumer-aerosol, and pump-spray teams planning a spray-pattern and plume-geometry study. They are starting points, not protocols. Most SP / PG studies need at least one custom fixture or a decision about acceptance criteria. If your device, formulation, or regulatory context differs from what is covered here, a call can help work through those details.

Q.What is the difference between plume geometry and spray pattern?
A.Plume geometry describes the expanding spray shape in air, measured as plume angle and plume width in flight. Spray pattern describes the deposited distribution on a defined target plane, including diameter, area, and circularity. Most nasal-spray submissions report both.
Q.How many actuations are needed per condition?
A.There is no single actuation count for every product or submission. Before testing, we define the device count, actuations per device, life stages, and replicates based on applicable product guidance, expected variability, and the precision or comparison objective.
Q.Can you control actuation force and timing?
A.Yes. Our Plume Master rig uses stepper control for force, displacement, velocity, and dwell. Manual, pneumatic, or mechanical fixtures are sized to mimic patient or operator use across the actuation profiles defined for the study.
Q.Do you support FDA-aligned nasal spray submissions?
A.Yes. We scope spray pattern and plume geometry against the applicable FDA nasal-product guidance. Spray-pattern target distance, plume visualization timing and orientation, actuation conditions, and acceptance criteria are defined separately in the protocol. USP <601> provides related dose-delivery and particle-size performance context; it is not a universal SP / PG imaging procedure.
Q.What do you deliver?
A.A PDF report with methods, fixtures, and results tables; CSV / XLSX datasets for plume and pattern metrics with replicate statistics; and annotated images plus side-by-side overlays for internal reviews and submission appendices.

Standards & guidance

ARE Labs is ISO/IEC 17025-accredited for its current testing scope. The protocol and report identify the spray-pattern and plume-geometry methods and which requested results fall within that scope. FDA product guidance informs applicable drug-product imaging work; USP <601> provides separate performance-quality context. Consumer and industrial sprays use separately defined protocols. The cards below list references relevant to SP / PG packages. Select a card to see the standard's role in a study, the deliverables it informs, and the tests we run that cite it.

Inhalation & Drug Delivery - Aligned

FDA nasal / oral spray

Nasal and oral spray products — bioequivalence and CMC framing for submissionsView standard ->Inhalation & Drug Delivery - Aligned

USP <601>

Inhalation and nasal drug products: aerosols, sprays, and powders — performance quality testsView standard ->QA & Regulatory - Aligned

ICH Q9

Quality risk management — investigation framing for sprayability defects and root-cause workView standard ->

Related services & devices

Service

Particle Size Distribution (PSD) Testing

Pairs with SP / PG on nasal-spray submissions — droplet-size statistics complementing plume and pattern geometry.Read more ->Devices

Intranasal Delivery Devices

Nasal pumps, multi-dose sprays, and unit-dose devices — full sprayability characterization across the device class.Read more ->Service

High-Speed Imaging & Velocimetry

Time-resolved diagnostics for the actuation event itself — pairs naturally with SP / PG failure investigations.Read more ->Devices

Pump Sprays & Pressurized Aerosols

Trigger pumps, propellant cans, and consumer aerosol containers — geometry and metric characterization across the spray-product portfolio.Read more ->