Aerosol Science

Spray Pattern & Plume Geometry Testing

Submission-grade plume angle, spray pattern, and shape metrics for nasal sprays, oral sprays, and pressurized aerosols, with faster development options.

A controlled actuation rig and laser-sheet imaging, paired with LaVision analysis, produce replicate-traceable plume geometry and spray pattern datasets aligned with FDA nasal-spray guidance.

ISO 17025FDA nasal / oral sprayUSP <601>ISO 27427Reviewed 2026-05-15
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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. For nasal sprays, oral sprays, and pressurized consumer aerosols, the method quantifies plume angle, plume width, and pattern diameter. ARE Labs combines laser-sheet imaging, controlled actuation, and LaVision analysis for FDA-aligned nasal-spray submission packages under USP <601>. The fixtures support development screening and root-cause work. SP / PG is foundational for:

  1. FDA-aligned nasal spray submission packages — plume geometry within ~30 ms of actuation plus spray pattern at FDA-recommended capture distances, framed under FDA nasal / oral spray guidance and USP <601>.
  2. Lot-to-lot and design-change comparability for nasal pumps, oral spray valves, and aerosol actuators — pump, nozzle, valve, or formulation updates under ICH Q5E and FDA change-control guidance with documented replicates.
  3. Robustness mapping across actuation force, fill level, viscosity, and temperature for consumer aerosols and pump sprays — supports EPA registration packages and ISO 27427-aligned nebulizing-equipment characterization.
  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 is central to the decision, whether the question is local deposition for nasal-spray bioavailability, coverage uniformity for consumer sprays, or sensitivity to formulation and actuation conditions. The images remain traceable to the defined fixture, distance, and image-quality acceptance criteria.

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 select the imaging configuration based on the device type and the decision the data must support. Submission-grade and development-screening fixtures use the same 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)
  • Plume angle, width, and pattern at FDA-recommended 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)
  • One set of actuations yields plume geometry, spray pattern, and droplet-size distribution — the trio that governs nasal-spray local deposition.
  • Strong framing for in vitro bioequivalence packages and predicate comparisons where the regulator wants the full sprayability picture, not three separate studies.
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

Each spray-pattern study uses a configuration matched to the device, its use condition, and the decision the data must support. We balance submission controls for actuation, distance, and image-acceptance criteria with the practical behavior of the device under test. During study planning, we set the dimensions below so the plume and pattern data remain 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

Replicate actuations per condition (typically n=15+ for submission work spanning beginning-middle-end of canister), with power sized to declared shot-to-shot and device-to-device variability.

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

Each spray-pattern study runs within a documented quality system aligned with the regulatory frameworks for nasal sprays, oral sprays, and consumer aerosols. The four anchors below define the data requirements carried through to the §7 outputs.

  • 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.
  • ISO 27427AlignedAnaesthetic and respiratory equipment — nebulizing systems and components.

Key data outputs & reporting

Each spray-pattern study includes underlying images and a documented set of plume and pattern metrics. Standard outputs cover plume angle and width versus distance; spray pattern diameter, area, circularity, and ellipticity; qualitative uniformity flags; replicate summary statistics; and traceable QA / QC controls. We format the package for regulatory submissions, change-control work, or design iteration. The deliverables below describe the standard SP / PG report. Comparability studies, predicate studies, and full canister-life mapping receive an extended package with the artifacts 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 plus statistical equivalence tests per ICH Q1E or product-specific 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

The QA / QC plan for each spray-pattern study is sized to the method and documents the required controls and verifications. Those checks reflect the regulatory frame, imaging chemistry, and decision the data must support. They run alongside laser-sheet capture, are audited under our ISO 17025 quality system, and remain traceable from sample receipt through the final result. Recovery and environmental monitoring are added when the assay requires them.

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 testing
900+Studies Performed
17+Years in operation
300+Clients supported

Common questions

Nasal-spray, consumer-aerosol, and pump-spray teams often ask the same questions when scoping spray-pattern and plume-geometry studies: which method to use, how actuation is controlled, how many replicates are needed, how comparability is framed, and what the final package includes. These answers are starting points, not protocols. If your device, formulation, or regulatory frame falls outside the examples here, contact us. Most SP / PG studies involve at least one custom fixture or image-acceptance decision, which is usually easier to resolve in a call than anticipate in a FAQ.

Q.What is the difference between plume geometry and spray pattern?
A.Plume geometry describes how the spray expands in air through measurements of plume angle and plume width in flight. Spray pattern describes the deposited distribution on a defined target plane using diameter, area, and circularity. Most nasal-spray submissions report both.
Q.How many actuations are needed per condition?
A.Replicate count depends on device variability and the comparability objective. Submission packages typically use n=15+ across the beginning, middle, and end of the canister, while development screening often uses fewer replicates. We set the count during study planning to meet the precision target.
Q.Can you control actuation force and timing?
A.Yes. The Plume Master rig uses stepper control to set force, displacement, velocity, and dwell. Depending on the study, manual, pneumatic, or mechanical fixtures are sized to mimic patient or operator use across the required actuation profiles.
Q.Do you support FDA-aligned nasal spray submissions?
A.Yes. We measure plume geometry at the FDA-recommended capture distances (typically 30 mm and 60 mm) using documented acceptance criteria. For submission packages, the method is aligned with FDA nasal / oral spray guidance and USP <601> framing.
Q.What do you deliver?
A.Deliverables include a PDF report with methods, fixtures, and results tables; CSV / XLSX datasets containing plume and pattern metrics with replicate statistics; and annotated images with side-by-side overlays for internal reviews and submission appendices.

Standards & guidance

ARE Labs aligns spray-pattern studies with the regulatory and consensus standards that apply to nasal-spray, oral-spray, and consumer-aerosol products. When a method falls within our third-party accredited scope, we identify it as accredited to ISO 17025. When we follow a standard outside that scope, we describe the method as aligned or conformant where applicable. The cards below list the standards most often relevant to SP / PG packages. Select a card to see the standard's role in the study, the deliverables it shapes, and the tests 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 ->Inhalation & Drug Delivery - Aligned

ISO 27427

Anaesthetic and respiratory equipment — nebulizing systems and componentsView 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 ->