Last updated: 2026-05-12
Disclaimer: This article provides informational procurement and quality-assurance guidance only. It is not medical advice and should not be used to make patient-care decisions.
Note on examples: Product links included below are provided as optional reference examples for evaluation and sampling, not as clinical recommendations.
If you’re building a Stage 3 product spec for silicone foam dressings, the hardest part usually isn’t finding suppliers.
It’s translating “good clinical performance” into KPIs that are measurable, comparable, and auditable—without accidentally optimizing one metric in a way that breaks another.
This post gives you a procurement-friendly KPI dossier you can hand to your QA, clinical, and sourcing teams: absorbency, retention, MVTR, peel-force, and wear time—plus the questions to ask so you can compare vendors fairly.
Key takeaway: You don’t “buy a silicone foam.” You buy a KPI profile—and the test methods + documentation that prove it.
What “Stage 3 KPIs” should mean (in buyer terms)
Many teams use “Stage 3 KPIs” to mean: the performance bar you need before a silicone foam dressing can be approved for higher-stakes wounds and real-world workflows (movement, moisture, fragile skin, longer wear).
In practice, that usually collapses into five measurable dossiers:
Absorbency: how fast and how much fluid the core can take up.
Retention: whether that fluid stays locked in (especially under pressure or shear).
MVTR (moisture vapor transmission rate): whether the system “breathes” enough to avoid a swampy microclimate.
Peel-force / adhesion: whether it stays on and comes off without skin trauma.
Wear time: how long it performs before you’re forced into an unscheduled change.
If you want your KPI set to survive internal review and supplier negotiation, you also need one meta-KPI:
Comparability: results that were generated under the same method, conditioning, fluid, time, and load.
A widely used framework for standardized wound dressing testing is EN 13726:2023 (absorption, MVTR, waterproofness, extensibility), which you can reference when defining what test families you expect to see in vendor documentation: EN 13726:2023 test methods for wound dressings.
The KPI dossier: what to measure, what to request, what to watch
1) Absorbency
What it tells you: whether the dressing can manage the expected exudate load without early saturation.
What to request from suppliers
Absorption test method and conditions (fluid type, temperature, sample size, time to saturation).
Results expressed in a comparable unit (and whether it’s “free swell” vs under load).
A note on where the absorbed fluid goes (core-only vs lateral spread vs “edge wicking”).
What to watch (common failure modes)
High absorbency with poor retention (looks great on paper, leaks in use).
Absorbency claimed without indicating test fluid (saline vs simulated exudate can change results).
2) Retention (a.k.a. “water-locking” under stress)
What it tells you: whether absorbed fluid stays inside the structure when the dressing is compressed (lying, sitting, footwear), flexed, or handled.
This is where vendor documentation often becomes slippery: “absorbent” is easy to claim; “retains under compression” is harder.
What to request from suppliers
Retention-under-compression data and the applied load/time.
Any “strike-through” or leakage observations.
Lot-to-lot variability summary (even a simple range is better than a single best-case datapoint).
What to watch
Test results at full saturation only. Some standardized tests can be conservative or unrealistic if they assume a dressing is worn to complete saturation; make sure the vendor clarifies how the lab condition maps to wear guidance (Cormica’s overview is a decent starting point when you’re aligning teams on what EN 13726 does and doesn’t represent: EN13726:2023 wound dressing testing standards (Cormica, 2025)).
3) MVTR (microclimate control)
What it tells you: whether the backing film + adhesive system allows enough moisture vapor to pass to avoid excess humidity buildup.
MVTR is usually expressed as g/m²/24h, but here’s the procurement trap:
You can’t interpret MVTR without knowing what the wound site and workflow demand.
MVTR can shift when you change film design, adhesive coat weight, or add layers.
What to request from suppliers
MVTR method (upright/inverted cup, with/without liquid contact) and test conditions.
Film type and whether the test is for the intact dressing system.
Any microclimate positioning claims backed by method (not just marketing language).
What to watch
“Breathable” used as a synonym for “good MVTR,” with no method.
MVTR quoted for a film alone while the product in use includes additional layers.
4) Peel-force / adhesion (stay-on ability vs skin safety)
What it tells you: whether the dressing stays in place under movement, moisture, and friction—without increasing skin trauma risk at removal.
For silicone foams, what you’re really balancing is:
enough anchorage to keep edges sealed, and
gentle removal for fragile periwound skin.
What to request from suppliers
Peel test method details (substrate, dwell time, peel angle, peel speed).
Peel-force results before and after stress (humidity exposure, repositioning, wear simulation).
Any claims about pain/atraumatic removal framed as “designed to” rather than absolute.
What to watch
A single peel-force number treated as universally “best.” Higher isn’t always better if your program includes fragile skin, frequent inspection, or re-positioning.
5) Wear time (planned vs actual)
What it tells you: how long you can reasonably expect performance before replacement (scheduled), and how often you’ll be forced into unscheduled changes.
Wear time isn’t just about absorption. It’s the outcome of the entire system:
absorption + retention + MVTR
adhesion stability (edges)
anatomical fit (creases, bony prominences)
workflow (showering, movement, inspection schedules)
What to request from suppliers
The wear-time claim and its conditions (wound type/exudate; inspection frequency).
Failure-mode definitions: what counts as “end of wear” (leakage, edge lift, strike-through, saturation indicator, odor).
What to watch
“Up to X days” with no definition of what triggers change.
The tradeoffs: what moves together (and what fights)
A useful Stage 3 spec isn’t a list of independent targets; it’s a set of guardrails.
Here are the tradeoffs your dossier should make explicit:
Absorbency vs MVTR: pushing for maximum fluid handling often changes layering and permeability; you want enough vapor escape without compromising barrier function.
Retention vs comfort/bulk: retention layers can increase thickness and stiffness.
Peel-force vs skin safety: stronger adhesion can reduce edge lift, but increases removal risk if not designed correctly.
Wear time vs re-positioning: if a dressing is frequently lifted for inspection, adhesion behavior over multiple reapplications matters.
If you document these tradeoffs in your dossier, you’ll reduce internal “spec ping-pong” where one stakeholder keeps moving one KPI without seeing the downstream effect.
How to compare silicone foam suppliers fairly (the part most specs miss)
If you only take the vendor’s headline KPI values, you’ll end up comparing apples to oranges.
Use this mini checklist to make the comparison auditable:
Test method: which standard/annex (or internal method) was used?
Test fluid: saline vs simulated exudate (and viscosity)?
Conditioning: temperature/humidity and sample pre-conditioning.
Load and time: especially for retention under compression.
Sample definition: intact dressing vs cut specimen.
Replicates + variability: how many samples? what’s the range?
Lot traceability: which production lot(s)?
Pro tip: If a supplier can’t supply method + conditioning + replicates, treat the KPI as a marketing claim, not an acceptance criterion.
Optional benchmark examples: how to use SLK Medical pages in a fair supplier comparison
If you want concrete product families to benchmark against your KPI dossier, you can scan the SLK Medical silicone foam dressing portfolio to understand common variant architectures (bordered, non-bordered, flex designs, silver options).
For a fair comparison workflow, treat any product page as a starting point (not proof). Use the same KPI dossier and the same documentation requests across all suppliers you shortlist:
Request the same test families (absorbency, retention under compression, MVTR, peel) under comparable methods/conditions.
Ask for replicates + variability (range/SD) and lot traceability.
Confirm intended use, wear-time conditions, and failure-mode definitions.
Use your internal acceptance criteria and risk management process to make the final selection.
Silicone Foam Dressing with Border (Pink Color) — positioned for moderate to high exudate and extended wear claims (often framed as “up to 7 days,” depending on scenario).
Silicone Foam Dressing – Border Flex — designed for conformability and “stay-on-ability” in harder-to-fit anatomy.
Silicone Wound Contact Layer — useful when you need a gentle contact interface in a layered system.
Silver options for antimicrobial programs:
What to request from SLK Medical (Stage 3-ready pack):
Absorbency + retention test reports with conditions (and which EN 13726 annexes or equivalent methods were used).
MVTR method statement for the intact dressing system.
Peel/adhesion method and results across stress conditions.
Wear-time guidance with failure-mode definitions.
Quality/compliance pack (e.g., ISO 13485 scope, change control approach, traceability, and document list).
A sampling plan aligned to your KPI dossier (variants, sizes, anatomical shapes).
Video: quick SLK Medical overview (OEM + wound dressing focus)
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FAQ
What’s the single most important KPI for Stage 3?
Retention under stress. If the dressing can’t keep fluid locked in under pressure/movement, it doesn’t matter how high the free-swell absorbency looks.
Do I need EN 13726 results for every product?
You don’t need that exact standard for every claim, but you do need standardized, comparable methods. EN 13726 is useful as a shared reference point for what “absorption/MVTR” testing should look like.
Can I use “up to 7 days wear time” as an acceptance criterion?
Treat it as a starting hypothesis. Make the supplier define conditions and failure modes, then validate with your own use scenario (anatomical site, exudate profile, inspection schedule).
Should Stage 3 specs include a numeric MVTR target?
Only if you can justify it by use scenario. Otherwise, specify the test method + minimum documentation first, then set numeric targets after early sampling data.
Next steps (low-commitment)
If you want to move from “claims” to a Stage 3-ready spec, ask for a vendor packet that maps directly to your dossier:
test methods + reports (absorbency, retention under compression, MVTR, peel)
variability / lot traceability
wear guidance + failure modes
sampling plan
Start with SLK Medical’s silicone foam family pages above, then request the documentation pack and samples that match your KPI dossier.
