ICH Q7 clause 7: Materials management

Materials management procedures must cover the entire material lifecycle from receipt through consumption. Each step (receipt, ID, quarantine, storage, sampling, testing, approval) needs specific procedures. Responsibilities across functions (warehousing, QC, QA, production) must be clearly defined. Cross-functional procedures are common failure points when handoffs aren't well-defined.

Receiving inspection is the first quality check. Every shipment must be visually examined for: label accuracy (supplier name matches expected, in-house name cross-reference), container integrity (no damage, dents, or holes), seal integrity (seals intact and matching shipping documents), tampering evidence (signs of unauthorized opening), contamination evidence (leaks, stains, foreign material). Materials stay in quarantine until approval.

Supplier qualification is risk-based — critical materials (APIs for final product, raw materials affecting CQAs) need rigorous qualification including audits; non-critical materials (packaging materials, commodity reagents) may use questionnaires or certificates. Approved supplier lists with expiration dates drive purchasing decisions. Quality agreements formalize expectations and responsibilities.

Purchasing against approved specifications with approved suppliers prevents quality risks. Every material receipt must be traceable back to an approved supplier and batch. Supplier changes are significant events requiring risk assessment and often re-qualification. CoAs from suppliers provide documented quality attributes and are typically required for API raw materials.

Supplier changes can invalidate process validation and impact API quality. Typical changes requiring notification: new manufacturing site, new synthetic route, new raw material source, specification changes, process changes affecting impurities. The manufacturer must assess each change for impact and implement mitigations, which may include additional testing, process revalidation, or supplier disqualification for significant changes.

This clause reinforces the receiving visual inspection requirement from 7.11 with emphasis on container-by-container examination (not just spot-checking). Every container gets a visual check. This prevents acceptance of partial damage hidden within a pallet or batch. The inspector must have clear criteria and training to know what constitutes acceptable vs rejectable condition.

Physical or electronic quarantine prevents use of untested materials. Physical quarantine uses separate warehouse zones or labeled containers. Electronic quarantine uses ERP system status that prevents picking of quarantined lots. Both are acceptable if effective. The key is that production cannot access materials until QA releases them, with the release decision based on sampling and testing results.

Bulk tanker deliveries present unique contamination risks since tankers may have previously carried other materials. Mitigation: certificate of last load (showing previous contents), certificate of cleaning, residue testing, or supplier audit verifying dedicated or properly cleaned tankers. Large storage tanks and their piping must be clearly identified to prevent product mix-ups.

Bulk material sampling is itself a contamination risk. Poor sampling technique can introduce contaminants from sampling equipment, sampling port environment, or previous samples. Dedicated sampling equipment per material, cleaned sample ports, and appropriate protective coverings reduce risk. Sample containers must be clean and properly labeled.

This clause focuses on permanent tank and piping identification. Every tank needs a unique ID, content label, and status (empty, filled, in-process). Piping identification should include content (e.g., 'Methanol', 'Solvent Waste') and flow direction to prevent connection errors during maintenance or batch setup. Color coding is commonly used in addition to labels.

Identity testing is the single non-negotiable test — it verifies the material is what the supplier says it is. Even with fully qualified suppliers using skip-testing arrangements, identity must still be confirmed on every batch. Common identity tests: IR spectroscopy, HPLC retention time match, specific chemical tests. Skip testing on other parameters (assay, purity) is acceptable with supplier qualification, but identity testing is mandatory.

Using supplier CoAs instead of full in-house testing requires robust supplier qualification. Typical requirements: (1) successful audit of supplier, (2) quality agreement covering CoA content and notification of changes, (3) verification testing of at least 3 batches matching supplier CoAs, (4) periodic re-verification testing, (5) identity testing always performed in-house. The manufacturer remains responsible for the quality of accepted materials.

Supplier qualification for skip testing or critical material acceptance requires on-site audit or equivalent evidence. Audit scope: quality management system, manufacturing process, QC laboratory, change control, deviation management, complaint handling, regulatory compliance history. Alternative evidence (paper qualification) may be acceptable for low-risk materials but not for critical materials.

Sampling plans should be statistically sound — not just 'grab a sample from the top container'. Factors: criticality (sample all containers for high-risk, subset for low-risk), variability (more samples for high-variability materials), supplier history (more for new/problematic suppliers), test requirements (enough material for all tests plus retains). Standard approaches include ANSI Z1.4 or custom plans based on risk.

Sampling responsibility rests with QA, even if physical sampling is performed by warehouse or production personnel. QA oversight ensures proper technique and prevents sampling bias. Sampling SOPs must be specific, and sampling personnel must be trained and qualified. Poor sampling technique can introduce contamination or fail to capture representative material.

Representative sampling captures the true quality of the batch — not just the easiest portion to reach. Stratification (layers of different quality within containers) is common with powders and requires multi-point sampling. For liquids, mixing before sampling or sampling at multiple depths addresses stratification. Sample containers must be clean, chemically compatible, and appropriately sized.

Storage conditions preserve material quality throughout the inventory holding period. Conditions must match material requirements: temperature (ambient, refrigerated, frozen), humidity (for hygroscopic materials), light protection (for photosensitive materials). Continuous monitoring with alarms detects excursions. Any excursions must be investigated for impact on material quality. Outdoor storage (rare) requires specific justification.

Status segregation prevents use of wrong material. Physical segregation: separate rooms, zones, or pallets for each status. Electronic segregation: ERP system preventing picking of non-released lots. Combinations are common. Visual identification (color-coded labels) supports both approaches. Status changes (quarantine → released, released → rejected) must be controlled transactions with audit trail.

Continuous monitoring (vs periodic spot checks) is preferred for controlled storage areas. Modern monitoring uses electronic data loggers or building management systems with alarms. Historical data enables trending to detect equipment degradation or HVAC issues before they cause excursions. Calibration of monitoring sensors is critical — drift can mask real problems.

FIFO prevents material obsolescence and reduces waste. For critical materials with strict shelf life, strict FIFO is essential. For commodity materials, FIFO is still standard practice. Exceptions to FIFO (e.g., using newer material for a critical batch) should be justified and documented. ERP systems typically enforce FIFO through pick list generation.

Rejected materials present contamination and mix-up risks if not properly controlled. Ideal handling: physical removal to a designated reject area, clear rejection labeling, prompt disposition (return or destruction). Temporary retention for investigation is acceptable but with clear status markings. Disposition decisions must be documented including who authorized and the method used.

Materials don't last forever. Re-evaluation determines if stored materials remain suitable. Triggers include: reaching re-evaluation dates, storage condition excursions, visual signs of degradation, extended storage, or prior rejection/return. Re-evaluation tests typically include identity, appearance, and critical quality attributes. Materials failing re-evaluation become rejected material subject to disposition procedures.