Cost Estimation

Cost Per Unit and Quoting in Sterile Barrier Manufacturing

What actually drives cost per sterilized unit, how to build a quote that holds up, and the estimating errors that quietly erase margin.

A defensible sterile barrier quote stacks six buckets: barrier material, conversion labor and machine time, sterilization service, validation amortization, scrap, and cleanroom overhead. For a typical pouched Class II device, material runs 35 to 50 percent of unit cost, sterilization 10 to 20 percent, direct labor 8 to 15 percent, and validation plus overhead the rest. The mistake most estimators make is quoting material and sterilization only, then absorbing validation and scrap in a vague markup. Price each bucket explicitly. If your fully loaded cost per pouch is 0.42 dollars and you quote a flat 15 percent margin without isolating scrap, a 6 percent scrap rate alone eats most of that margin.

Barrier material is the anchor. Medical-grade coated Tyvek 1073B runs roughly 0.09 to 0.16 dollars per pouch face depending on size, and the film web adds a similar amount, so a header bag or pouch commonly lands at 0.18 to 0.35 dollars in material before conversion. Use the Pouch Material Yield calculator to convert roll price into cost per finished pouch, because paying by the square meter while quoting by the piece is where margin leaks. A 500 m roll costing 640 dollars that yields 2,400 good pouches is 0.267 dollars per pouch, not the 0.256 dollars the nominal 2,500 count implies.

Sterilization is priced by method and load, not by piece, so unit cost depends entirely on how densely you pack. EO contract service commonly runs 900 to 1,600 dollars per pallet per cycle; if a pallet holds 1,800 saleable units, that is 0.50 to 0.89 dollars per unit, but a denser pallet at 2,600 units drops it to 0.35 to 0.62. Gamma is quoted per kGy per unit mass or per pallet-hour. Use the Gamma Dose Cost and Sterilization Cycle Capacity tools together, because the single biggest lever on sterilization cost per unit is fill efficiency, not the posted rate.

Labor and machine time attach to the pouch sealer and cleanroom assembly line. A rotary or continuous heat sealer running at 30 pouches per minute with one operator at a loaded rate of 42 dollars per hour costs 42 divided by 1,800 pouches per hour, or 0.023 dollars per pouch in direct labor, plus machine burden. Setup and changeover are the hidden cost: a 45 minute changeover on a 20,000 unit lot adds only 0.0016 dollars per unit, but the same changeover on a 2,000 unit lot adds 0.016 dollars, ten times more. Quote small lots with their real setup amortization.

Validation is a fixed cost you amortize over the lot or program volume, and it is the number most quotes get wrong. A full sterilization validation with dose mapping, half-cycle EO runs, and package integrity testing can cost 25,000 to 80,000 dollars. The Validation Batch Cost calculator spreads that over expected volume: 45,000 dollars across 3,000,000 annual units is 0.015 dollars per unit, but the same 45,000 dollars on a 150,000 unit niche product is 0.30 dollars per unit. Never quote a low-volume specialty device on high-volume validation assumptions, or you give away the entire program margin on paperwork.

Scrap and rework are real dollars, not a rounding error. Track two rates: material scrap from web breaks and seal failures, and finished-unit rejects from failed integrity testing. If material scrap is 4 percent and finished rejects add 2 percent, effective yield is about 94 percent, so divide clean cost by 0.94, adding roughly 6.4 percent to unit cost. The Packaging Scrap Cost calculator ties scrap back to material and the value already added at the point of failure, since a pouch that fails a seal test after sterilization carries material, labor, and sterilization cost, not just film.

Two overhead items finish the quote. Cleanroom time is expensive: an ISO 7 room can cost 30 to 75 dollars per square meter per month to run, and you allocate it by occupancy. The Cleanroom Utilization tool converts idle capacity into a per-unit burden, so a room running at 55 percent utilization loads far more overhead per part than one at 85 percent. Finally, lot release time carries inventory cost. The Lot Release Time calculator shows that a 14 day release cycle on a 250,000 dollar lot at a 12 percent carrying rate ties up about 1,150 dollars in holding cost, which belongs in the quote or in your working capital plan.

Published 2026-07-02.