More isn’t always better—especially when it comes to your warehouse.
In industrial distribution, especially within the glass, ceramics, and refractories verticals, there’s a dangerous assumption that more SKUs mean more opportunities. The thinking goes: if a customer asks for something once, it deserves a spot in the catalog forever. But for distributors carrying complex materials like aluminosilicate firebricks, borosilicate sheets, or low-expansion ceramics, this mindset can lead to SKU proliferation—a creeping issue that quietly erodes profitability and operational control.
SKU proliferation occurs when new products are continually added to meet niche demands, but rarely reviewed or pruned. Over time, the warehouse becomes filled with slow-movers, one-off product codes, and overlapping SKUs. The costs are subtle at first—an extra pallet here, a slightly longer picking route there. But left unchecked, SKU creep can become a multi-front threat.
1. Inventory Carrying Costs Balloon
Every SKU sitting idle is capital tied up. Whether it’s a pallet of castable refractory with a 24-month shelf life or a rarely used ceramic tile mold, each item incurs warehousing costs—rent, insurance, depreciation. Add in the administrative burden of tracking, labeling, and counting these SKUs, and the impact becomes significant. In a sector where margins can hover in the single digits, dead stock quietly chips away at profitability.
2. Complexity Slows Down Fulfillment
With a bloated SKU base, pickers must navigate more zones, face higher mis-pick risks, and spend more time on stock checks. For a distributor supplying custom-insulated glass units or cordierite kiln furniture, fulfillment speed is a differentiator. SKU proliferation clogs the process, increasing order cycle time and decreasing service levels.
3. Diluted Purchasing Power
Distributors with a sprawling catalog often buy smaller volumes across more SKUs, which weakens their bargaining position with suppliers. Instead of securing volume-based pricing on high-turn items like insulating bricks or sheet glass, they end up paying premiums on niche products with minimal lift.
4. Forecasting Becomes Unreliable
Forecasting tools rely on historical sales and usage patterns. But when half your SKUs have no meaningful history—or worse, were sold once in two years—your forecasts become noise. Procurement teams are forced to guess at reorder points, leading to either stockouts or overstock.
5. Customer Confusion
Paradoxically, offering too many SKUs can make it harder for customers to find what they need. In ceramics or refractory sales, where specifications already involve chemistry, temperature ratings, and dimensional tolerances, an overly complex catalog can overwhelm buyers and stall purchases.
What Causes SKU Proliferation?
Often, it’s a combination of good intentions and lack of controls. Sales reps want to say “yes” to every client request. Procurement teams add SKUs to test new materials without sunset plans. ERP systems lack workflow triggers for review. In some cases, distributor-customer agreements encourage stockpiling for just-in-case scenarios, which eventually become just-in-warehouse problems.
Preventing the Spread
Implement SKU Governance: Every new SKU should go through a formal review. Is it replacing something? Does it serve more than one client? Can it be ordered on-demand instead of stocked?
Set Review Intervals: Conduct quarterly or semi-annual audits of SKUs by velocity and margin contribution. Retire underperformers, flag overlaps, and consolidate where viable.
Bundle and Standardize: Where possible, offer good-better-best tiers that cover most customer needs with fewer SKUs. For example, in the refractories space, a Tier 1 dense brick, a Tier 2 general-purpose castable, and a Tier 3 high-performance lining may cover 90% of project specs.
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SKU proliferation is like slow rust on a warehouse floor—easy to ignore, but costly over time. Distributors in the glass, ceramic, and refractory industries who don’t put controls in place risk bloated inventory, eroded margins, and slower customer response. The solution isn’t fewer products—it’s smarter ones. Manage your catalog like you manage your balance sheet: with vigilance, structure, and purpose.
