KEY TAKEAWAYS
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PDMS capacity ramps: roughly 1,000 pieces in the first month, 5,000 by the second, 20,000 by the fourth, up to 80,000 a month at capacity. A plan that needs a hundred thousand units in the first quarter is a conversation for before design approval.
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A transfer to injection molding is a two-to-five-year program, not a material substitution: bonding, surface chemistry and often the assay itself have to be re-established and re-validated.
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Start DFM only when all three trigger conditions hold — sustained demand above roughly 500 units a month, chemistry that tolerates thermoplastics, and a frozen design. The cost of waiting is a few months of higher unit cost; the cost of proceeding early is a tool that has to be recut.
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The strongest position is PDMS shipping while plastic tooling is built, with one supplier accountable for both. And where a device depends on gas permeability, elasticity or features plastics cannot hold, PDMS is the product's material, not a stage.
\ SCALING
Scaling: what the ramp actually looks like
Capacity for PDMS does not arrive all at once, and it should not be promised that way. The realistic shape of a ramp for a new product is set by how fast tooling can be replicated and how fast operators can be trained to a stable yield.
MONTH 1
chips / month
1,000
First qualified line
MONTH 2
chips / month
5,000
SOPs, training, molds
MONTH 3
chips / month
20,000
Additional lines
AT CAPACITY
chips / month
80,000
Current PDMS ceiling
Figure 6 — Typical capacity ramp for a new PDMS product after design approval.
MONTH 1
chips / month
1,000
First qualified line
First articles inspected against the drawing; process window confirmed on the actual geometry.
MONTH 2
chips / month
5,000
Yield work
SOP refinement, operator training, additional molds and fixtures. Most of the gain comes from yield, not added capacity.
MONTH 3
chips / month
20,000
Additional lines
Tooling is replicated rather than re-lithographed, so this step is fast.
AT CAPACITY
chips / month
80,000
Current PDMS ceiling
The ceiling of current PDMS capacity across the network.
Lead time on an established design is two to three weeks after design approval, with expedites available. There is no strict minimum order quantity, though pricing improves materially with batch size. Parts ship as bare chips, as chips with tubing pre-assembled, or as fully integrated cartridge assemblies — the last of which removes an assembly step, and its associated yield loss, from your own operation.
THE NUMBER THAT MATTERS FOR PLANNING
Roughly 1,000 pieces in the first month, 5,000 by the second, 20,000 by the fourth. If your commercial plan needs a hundred thousand units in the first quarter, that is a conversation to have before design approval, not after.
\ THE TRANSFER
A transfer is a program, not a material substitution
Injection molding is the right destination for many microfluidic products and the wrong destination for others. What is almost always wrong is the timing — teams begin the transfer before the design is stable, freeze a geometry that then has to change, and lose years of selling time.
Moving a device from PDMS to a thermoplastic is not a matter of sending the same drawing to a different supplier. The work spans material selection, design for manufacturability, metrology, tool design, bonding development and re-validation, and in practice it runs two to five years. Three parts of it are routinely underestimated.
UNDERESTIMATED · 1
Bonding is a development project of its own
Thermoplastic bonding — thermal compression, solvent, UV-curable, adhesive, laser or ultrasonic — has to be developed and qualified for the specific material pair and geometry [5]. It does not transfer from the PDMS process.
UNDERESTIMATED · 2
Surface chemistry has to be re-established
Wettability, protein binding and any functionalization are material-specific. A protocol tuned on PDMS is not valid on COC or COP.
UNDERESTIMATED · 3
The assay itself may shift
Because PDMS absorbs lipophilic compounds and thermoplastics largely do not, an assay calibrated in PDMS carries an embedded, material-specific dose offset. Removing that offset changes the result — which means re-validation, not just re-qualification.
The processes involved: Cleanroom injection molding · Bonding & sealing · Surface functionalization · Product design & DFM.
\ TIMING
When to start
TRIGGER CONDITIONS — ALL THREE SHOULD BE TRUE
-
Volume. You expect sustained demand above roughly 500 units per month, with a credible path to substantially more.
-
Chemistry. Your assay tolerates thermoplastics — no dependence on gas permeability, elastomeric deformation or PDMS-specific surface behavior.
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Design stability. The geometry, the reagent set, the optics and the instrument interface are frozen. Tooling before this point freezes a design before the biology, optics or integration is mature.
If all three hold, start DFM. If any one of them does not, the cost of waiting is a few months of higher unit cost; the cost of proceeding is a tool that has to be recut.
\ BY APPLICATION
Guidance by application
CASE
APPLICATION
RECOMMENDED PATH
Diagnostics with a frozen workflow
Move to injection molding as soon as the design is frozen — volumes of hundreds of thousands to millions per year justify the tool quickly
Organ-on-a-chip and MPS
Stay in PDMS through discovery; consider a thermoplastic transfer only once the workflow is fixed and gas exchange is not load-bearing
Single-cell and NGS sample prep
Launch in PDMS; begin the plastics path at several hundred units per month, keeping PDMS shipping through the transition
Droplet microfluidics
Evaluate early — regulatory pressure on certain fluorinated oils and supplier discontinuations are pushing some groups toward COC/COP or glass
High-fidelity micro/nano features
Stay in PDMS, or use hybrid integration — features that are difficult or uneconomic to hold in plastics are exactly where PDMS earns its cost
\ CASE
A worked example
The timeline below is a real program. It is unremarkable in its engineering and instructive in its sequencing.
Figure 7 — A PDMS-to-injection-molding transition, 2018 to 2022. Revenue began in mid-2020 on PDMS parts, roughly two years before DFM for injection molding began.
Chip design started in September 2018 and PDMS prototyping in January 2019 at about a thousand parts a year. Functional verification completed that August. By November 2019 the same design was running in PDMS at a hundred thousand parts a year, and initial sales began in June 2020 — on PDMS parts. Reagent development and system optimization continued into January 2022, DFM for injection molding started in April 2022, and injection molding subsequently reached a million parts a year.
The point is the overlap. The product was generating revenue for roughly two years before DFM for the injection-molded version even began, and — critically — the design was not frozen for tooling until after the reagent and system work was finished. Had tooling started in 2020, the changes made through 2021 would have been changes to a cut tool.
\ RECOMMENDATION
Run both, deliberately
The strongest position is not PDMS or plastic. It is PDMS shipping while plastic tooling is built, with one supplier accountable for both, so the DFM work is informed by the parts that are actually in the field. That is the practical meaning of "don't pause revenue to change material".
WHEN NOT TO TRANSITION AT ALL
If your device depends on gas permeability for cell viability, on elastic deformation for a valve or membrane, on conformal or reversible sealing, or on features that plastics cannot economically hold, then PDMS is not a stage in your product's life. It is your product's material — and the work is to manufacture it properly, not to replace it.
Source on this page: [5] Shakeri, Khan, Jarad & Didar, The fabrication and bonding of thermoplastic microfluidics: a review, Materials 15, 6478 (2022). Capacity figures and the worked example are HiComp production data. Full list on the guide overview.
\ CONTINUE
Continue reading
The complete paper is available as a PDF (16 pages, 1 MB): Industrializing PDMS — a manufacturing and decision guide.
How an engagement runs
01. Proposal &
Contract
Timeline: 6 - 7 Weeks
From first conversation to purchase order — initial meeting and indicative quote, NDA, a written design evaluation, technical meeting, firm quote, contract.
02. Tooling & First Article
Timeline: 2 - 3 Weeks
Mold design, replication from the master pattern, and first-article inspection against your drawings.
03. Ramp & Mass Production
Timeline: Month 1 – Month 4+
Roughly 1,000 pieces in month one, 5,000 by month two, 20,000 by month four — up to 80,000 a month at full capacity.
\ START HERE
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