How to Write a URS for a Tablet Blister Packing Machine

A URS is written before the machine exists — the document defines what “acceptable” means, not the supplier.

Why Most Pharma Teams Get the URS Wrong — and What It Costs Them

Three weeks into a commissioning job in Karachi, I sat across from a procurement director and a supplier engineer who were both holding the same two-page document and reading it in entirely different ways. The procurement team had written “output: high speed.” The supplier had built a machine rated at 150 blisters per minute. The plant needed 220. Nobody was lying. The URS had simply not defined the number.

That conversation cost the client fourteen weeks and a renegotiation worth $60,000. It was not the most expensive version of this story I have seen. That happened in a Bangladeshi plant in 2021, where an ambiguous clause on PLC data logging meant the FDA-destined line failed 21 CFR Part 11 review during pre-approval inspection — pushing the NDA timeline by eleven months.

Cheap suppliers particularly benefit from ambiguous URS documents. Ambiguity is their protection. When a clause reads “the machine shall comply with GMP,” that sentence is functionally unenforceable. GMP is a philosophy, not a specification. The URS must name the specific regulation, the specific test method, and the specific numerical pass threshold. Every clause that lacks a number is an invitation to dispute.

The Four-Pillar URS Structure for a Tablet Blister Packing Machine

Over 20 years I have reviewed, written, and disputed more URS documents than I can count. The ones that hold up at FAT and SAT — regardless of supplier country — all share the same four-pillar architecture. The ones that collapse share the same flaw: they describe what the machine looks like instead of what it must prove.

Pillar 1: Production Output & Speed Requirements

This section defines the measurable performance contract. “High speed” is not a specification. The clause must state: rated output in blisters per minute at defined blister dimensions, maximum allowable production variance (±3% is standard), minimum net OEE target (typically ≥85% during SAT), and warm-up time to rated speed from cold start.

For a tablet blister packing machine running standard 10-tablet cards at 4×2 blister layout, the clause might read: “Rated output: 200–250 blisters/min at 80×57 mm blister card dimensions, ±3% over a 60-minute continuous run test.” That sentence is enforceable. The version without numbers is not.

Pillar 2: Sealing Integrity & Forming Material Specifications

Sealing integrity is where most disputes originate. The URS must define: sealing temperature range and tolerance (±2°C is achievable and should be required), sealing pressure (N/cm²), dwell time, and the test method used to verify integrity. The standard reference is ASTM F2338 for non-destructive dye-ingress testing, which USP <1207> also references for container closure integrity.

Forming material compatibility must be explicit. If your product requires PVDC/PVC laminate at 250 μm or cold-form Alu-Alu foil, the URS names those materials and specifies the forming station parameters that apply to each. A machine qualified on PVC alone cannot be assumed to handle Alu-Alu without additional validation. That assumption has caused re-validation cycles I have personally spent months correcting.

Sealing temperature tolerance (±2°C) and dwell time must appear as numbered clauses in Pillar 2 — not as general GMP statements.

Pillar 3: Upstream/Downstream Integration Protocols

The blister machine does not exist alone. It connects to a tablet feeder upstream and a cartoning machine or track-and-trace system downstream. The URS must define: communication bus protocol (Ethernet/IP, PROFINET, OPC-UA — pick one and name it), conveyor belt speed and handoff clearance, alarm escalation logic, and interlock behavior on upstream/downstream fault.

I have seen a perfectly specified blister machine sit idle for three weeks because its Siemens S7-1200 PLC could not handshake with the cartoner’s Allen-Bradley ControlLogix without a custom gateway module — which was nobody’s budget line item. The URS integration clause would have caught this in the design review stage. Three weeks idle on a commissioned line is not a small number.

Pillar 4: Regulatory Documentation Requirements

This pillar defines what the supplier must deliver — not the machine, but the paper. Required deliverables typically include: Factory Acceptance Test (FAT) protocol and checklist, Site Acceptance Test (SAT) protocol, IQ (Installation Qualification) document template, OQ (Operational Qualification) document with test scripts and acceptance criteria, and 21 CFR Part 11 compliance declaration (if applicable). Each document must be listed by name in the URS with delivery timeline relative to FAT date.

Without this clause, suppliers treat documentation as optional post-delivery work. I have received machines where the IQ document arrived six weeks after FAT — during which time the validation timeline had already slipped. For teams working toward a detailed IQ/OQ/PQ validation process, that slip is measured in months, not weeks.

URS Clause Requirements by Regulatory Market — What Must Appear for FDA vs. WHO GMP vs. EU Annex 1

* Optional in the regulatory sense — both clauses are recommended by HIJ for all markets regardless of minimum requirement.

A URS that lacks numbered acceptance criteria for sealing temperature tolerance, reject rate, and PLC audit-trail format is not a specification — it is a wish list. In 20 years I have never seen a supplier lose a SAT dispute when the URS contained vague language. Not once.
— Forester Xiang, HIJ Machinery

Forester’s Insight

Forester Xiang — Founder, HIJ Machinery

Прямой ответ: A well-written URS for a tablet blister packing machine is not a wish list — it is a legally binding technical contract that defines your cGMP compliance boundary, your FAT/SAT acceptance criteria, and your supplier’s accountability before a single bolt is tightened.

The Field Experience: In my 20 years commissioning blister lines across South Asian and Latin American pharma plants, I have watched procurement teams hand suppliers a vague two-page URS, only to face catastrophic disputes during SAT — because nobody defined the reject rate tolerance, the aluminum foil tension parameters, or the PLC data-logging format required for 21 CFR Part 11 compliance. The hidden trap? Cheap suppliers love an ambiguous URS. It becomes their escape hatch when performance falls short.

Стратегический совет: Build your URS around four pillars: output speed, sealing integrity standards, upstream/downstream integration protocols, and regulatory documentation requirements. At HIJ, we provide customers with a pre-validated URS template drawn from real turnkey project experience — so your specification closes every loophole before the contract is signed. Teams targeting full GMP and FDA compliance for tablet blister lines will find the URS is the document that determines whether the rest of the compliance program succeeds or stalls.

Step-by-Step: How to Write a URS for a Tablet Blister Packing Machine

The URS is Step 0 of the IQ/OQ/PQ lifecycle — everything downstream references back to it.

1. Define production scope and product profile. List every tablet form factor the machine must handle: round standard-concave, capsule-shaped, oblong, and any unusual geometries. State the size range (e.g., 5–22 mm diameter), hardness range (typically 40–200 N for standard-compressed tablets), and friability threshold (≤1.0% per Ph. Eur.). This becomes the basis for tooling qualification.
2. Specify rated output with tolerances. State blisters per minute at defined blister card dimensions. Add minimum net OEE target (≥85% over a 60-minute run), warm-up time (≤15 minutes from cold start), and changeover time for format change (≤30 minutes is achievable on modern servo-driven platforms). No ranges without numbers.
3. Define forming material compatibility. Name the specific materials: PVC (250 μm standard), PVDC/PVC laminate (60 g/m² PVDC coating), Aclar (30–51 μm), or cold-form Alu-Alu foil. For each material, state the required forming station temperature range and maximum forming depth. A machine specified for PVC at 100–130°C cannot be assumed to form Alu-Alu at ambient without mechanical modification.
4. Draft sealing station parameters. Sealing temperature: state nominal value and tolerance (±2°C). Sealing pressure: state N/cm² range. Dwell time: state milliseconds at rated speed. Reference the test method: ASTM F2338 dye-ingress at 60 mbar per USP <1207>. Include minimum seal strength threshold (typically ≥1.5 N/15 mm peel strength for standard PVC/Al).
5. Write integration and communication clauses. State the required communication protocol, upstream feeder handoff spec (conveyor speed, transfer clearance), downstream cartoner interlock behavior, and alarm escalation matrix. Name the specific PLC brand and model required — or state approval is required if the supplier proposes an alternative. Name field device brands if your plant has a standardized components list.
6. Add regulatory documentation deliverables. List every required document by name with delivery deadline relative to FAT date. Include: DQ report (if required), FAT protocol (10 days before FAT), IQ document template (at FAT), OQ test scripts with acceptance criteria (at FAT), 21 CFR Part 11 compliance declaration (at FAT), CE declaration of conformity, and operating manual in the required language.
7. Define FAT and SAT acceptance criteria. FAT is typically conducted at the supplier’s facility with your product or a qualified surrogate. Define: minimum run duration (typically 4 hours at rated speed), acceptable defect rate during FAT run, documentation completeness check, and sign-off authority. SAT criteria mirror FAT but at your site post-installation and under your utility conditions.
8. Cross-functional review and sign-off. The URS must be reviewed and signed by: Engineering (technical feasibility), QA (regulatory compliance), Production (operational parameters), and Procurement (contractual completeness). A URS signed only by procurement — without QA signature — is not a valid GMP document. That is a fact I have had to explain more times than I care to count.

URS Checklist: 20 Must-Have Clauses Before You Send the Document to Any Supplier

Of the URS documents I have reviewed from clients across Southeast Asia, Latin America, and the Middle East, fewer than 30% contained all 20 of these clauses on first draft. The gap is almost always in Section 4 (documentation deliverables) and Section 5 (acceptance criteria). Use this list as a pre-issue gate.

• ✅Rated output (blisters/min) at defined blister card dimensions with tolerance (±X%)
• ✅Minimum OEE target (≥85% during SAT run) and minimum continuous run duration for acceptance test
• ✅Changeover time for format change between product SKUs (≤X minutes)
• ✅Tablet form factor range (diameter/length/width min–max; hardness range; friability threshold)
• ✅Forming material list with named materials and grade specifications (e.g., PVC 250 μm, PVDC laminate 60 g/m²)
• ✅Forming temperature range per material with ±tolerance and control accuracy
• ✅Sealing temperature (nominal ±2°C tolerance) and sealing pressure (N/cm²)
• ✅Sealing dwell time (ms at rated speed) and seal strength minimum threshold (N/15 mm peel)
• ✅Integrity test method referenced: ASTM F2338 / USP <1207> dye-ingress at defined mbar
• ✅Maximum reject rate at rated speed (≤X% by count) with named reject mechanism
• ✅Vision/inspection system specification (if required): camera resolution, detection categories, false-reject limit
• ✅PLC brand/model (or approval clause) and communication protocol (Ethernet/IP, PROFINET, OPC-UA)
• ✅21 CFR Part 11 clause (if FDA market): user roles ≥3, audit trail fields named, data export format
• ✅Upstream feeder integration: conveyor handoff speed, clearance dimensions, interlock logic
• ✅Downstream integration: cartoner handoff, track-and-trace interface, alarm escalation matrix
• ✅GMP structural compliance: 316L SS contact parts, Ra ≤0.8 μm surface finish, dead-zone-free design, no paint on product contact surfaces
• ✅Documentation delivery schedule: FAT protocol, IQ template, OQ scripts, 21 CFR Part 11 declaration — each with delivery deadline
• ✅FAT acceptance criteria: minimum run hours, defect rate limit, documentation completeness gate, sign-off authority names
• ✅SAT acceptance criteria: site utility conditions defined, minimum run duration, regulatory observer access if required
• ✅Cross-functional sign-off: Engineering, QA, Production, and Procurement signatures before supplier issue

Where URS Clauses Break Down at FAT — 3 Real Failure Patterns

A GMP-compliant blister line in a pharmaceutical cleanroom — every parameter visible on that control panel should trace back to a numbered URS clause.

How Your URS Flows Into IQ, OQ, and PQ — The Document Traceability Chain

The URS is not a standalone procurement document. It is Step 0 of the qualification lifecycle. Under EU GMP Annex 15 and WHO TRS 992 Annex 3, the Design Qualification (DQ) document verifies that the proposed design meets URS requirements. IQ confirms installation against URS physical specifications. OQ tests operational parameters against URS performance thresholds. PQ demonstrates the machine produces acceptable product under real conditions — defined by URS output requirements.

The traceability matrix — a table mapping each URS clause to the corresponding IQ/OQ/PQ test script — is what an FDA reviewer checks first during a pre-approval inspection. If URS Clause 4.2 states “sealing temperature: 170°C ±2°C,” the OQ must contain a test verifying that temperature across the full sealing station width. If the URS clause did not contain a number, the OQ cannot contain a pass/fail criterion. That gap is a finding. For a complete technical walkthrough of the validation process itself, the tablet blister machine IQ/OQ/PQ guide covers the test protocol structure in detail.

I won’t tell you the URS-to-PQ chain is simple. It involves your API risk classification, your regulatory reviewer’s expectations for the destination market, and sometimes your relationship with the validation consultant who wrote the master plan. But the foundation is always the same: a URS clause with a number is a testable statement. Everything else is noise.

Of the 31 blister line projects I handled in Southeast Asia and Latin America between 2018 and 2023, 17 required at least one URS revision after initial supplier review — and in 11 cases, the revision prevented a FAT dispute that would have cost more than $40,000 to resolve post-delivery.
— Forester Xiang, HIJ Machinery

Frequently Asked Questions: URS for Tablet Blister Packing Machines