Why raw materials storage and tracking are a single problem
Raw materials sit at the front of your supply chain: get their storage and tracking wrong and every step downstream, production scheduling, purchasing, cost accounting, inherits the error. A material that is physically present but not recorded looks like a shortage on paper and triggers an unnecessary reorder. A material that is recorded but stored inconsistently costs a production worker time hunting for it, or worse, gets used from the wrong batch.
Treat the two as connected from the start: a storage system built around clear locations and labels is only useful if those locations and labels are also what your tracking system records, and a tracking system is only accurate if physical put-away actually follows the plan.
Planning where raw materials live
Start by cataloging every raw material you use, direct materials that end up in the finished product, indirect materials like lubricants or cleaning supplies, and consumables, then group them by physical characteristics: size, weight, whether they need climate control, and whether they are hazardous. This grouping, not alphabetical order or arrival date, should drive where each material is stored.
Place your highest-volume, most frequently used materials closest to the production floor to cut walking time and handling on every build. Slower-moving or bulk-storage materials can sit further out. Draw the layout out as a map before moving anything, it is much easier to catch a bad location decision on paper than after pallets are already racked.
- Catalog materials as direct, indirect, or consumable before assigning storage locations
- Group by size, weight, and storage requirement, not alphabetically or by arrival order
- Put high-turnover materials closest to production; slower movers further out
Labeling locations and assigning SKUs
Every shelf, bin, and rack position needs a clear, standardized label, and every material needs a unique SKU (stock-keeping unit) code. This pairing, SKU to location, is the foundation both storage and tracking depend on: without it, "count what is on shelf B-12" and "look up quantity of resin-4mm-white in the system" are two disconnected tasks instead of one lookup.
Keep the labeling convention consistent across the whole facility so a new hire can find a material from a location code alone, without needing to ask someone who has worked there for years. Barcode or QR labels on both the location and the material packaging let a handheld scanner confirm the two match during put-away and picking.
Physical storage conditions and safety
Match the storage environment to what the material actually needs. Temperature- or humidity-sensitive materials need climate control, not just a corner of the warehouse; light-sensitive chemicals need opaque containers or windowless storage; perishable materials need refrigeration with monitored temperature logs, not just a fridge that is assumed to be working.
Hazardous materials have their own requirements: store them separately from general stock, follow local regulations for ventilation and spill containment, and post clear warning signage. Getting this wrong is not just an inventory accuracy problem, it is a safety and compliance one, so treat hazardous material storage as a distinct checklist item, not an afterthought bolted onto general storage planning.
Rotating stock: FIFO and FEFO
For most raw materials, use FIFO (first in, first out): the oldest stock on the shelf gets used first, so nothing sits at the back of a bin indefinitely while newer material gets picked from the front. Shelf and bin layouts that load from one side and pick from the other make this the physical path of least resistance rather than something workers have to remember to do.
For anything with an expiration or shelf-life date, food ingredients, adhesives, certain chemicals, use FEFO (first-expiry, first-out) instead: sort and pick by expiration date rather than receipt date, since a later-arriving batch can still have an earlier expiry than stock already on hand.
Tracking raw materials: methods that actually keep up
A perpetual inventory system, one where quantities update in real time as materials are received, moved, and consumed, is what keeps recorded stock matching physical stock day to day, instead of only being accurate right after an annual count. Barcode or QR scanning at receiving, put-away, and consumption is what makes a perpetual system practical: every movement gets logged at the point it happens rather than batched into an end-of-day spreadsheet update.
The most reliable way to track consumption is tying it to production directly through a bill of materials (BOM). A BOM lists every raw material and the exact quantity a finished unit consumes, so when a work order completes, the system deducts the correct amount of each material automatically instead of someone manually subtracting from a spreadsheet, and a shortage against the next scheduled run gets flagged before it stalls a build.
Lot and batch tracking for traceability
Track raw materials by lot or batch number, in addition to SKU, whenever the material is perishable, regulated, or needs traceability back to a specific supplier shipment, food ingredients, pharmaceutical inputs, or safety-critical components. Lot tracking lets you trace exactly which finished units used a specific incoming batch, so if a supplier issues a recall on one shipment, you can identify the affected output without pulling every unit made in a broader date range.
Setting reorder points and running counts
Set a reorder point for each raw material based on how fast it is actually consumed and how long the supplier takes to deliver, not a round number picked once and left alone. Track actual supplier lead times over several months and use a high percentile of that range, not the average, since an average lead time still leaves you short whenever a shipment runs long.
Classify materials by consumption value (an ABC analysis) and count them accordingly: your highest-spend materials deserve weekly or biweekly cycle counts, while low-value, stable-use materials can be counted monthly or quarterly. Full physical counts still matter periodically to catch what cycle counts and daily scanning miss, but they should not be the only check on raw material accuracy.
Common mistakes to avoid
Most raw materials accuracy problems trace back to a handful of recurring gaps rather than one big failure.
- Storing by arrival convenience instead of by a planned layout, so locations drift from what the system records
- Skipping lot tracking on regulated or perishable materials until a recall or audit forces the question
- Setting reorder points once and never revisiting them as supplier lead times or usage rates change
- Not capturing scrap or yield loss during production as inventory adjustments, letting recorded stock quietly drift above physical stock
- Inconsistent unit-of-measure conversions between purchasing (by the ton) and production consumption (by the kilogram)
Keep raw materials organized and accounted for
StockFlow ties raw material locations, lot numbers, and bill-of-materials consumption together, so a completed work order updates stock automatically and shortages surface before they stall production.
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