OEM Case Cost Breakdown: What's in the $25

When you pay $25 for an OEM protective case, where does the money go? Understanding the cost breakdown helps you evaluate supplier quotes, identify hidden costs, and negotiate effectively. This guide, based on KeXinMaterials' internal cost structure and 12 years of OEM experience, breaks down the $25 case into its component costs.

By the end of this guide, you will understand: material costs (40-50%), foam costs (10-15%), labor costs (10-15%), overhead (10-15%), and margin (10-20%). You will also learn how to optimize each cost driver.

Key fact: A $25 FOB Shenzhen case breaks down to: PP resin $3-5, foam $3-5, labor $2-4, factory overhead $3-5, mold amortization $1-2, QA/QC $1-2, packaging $1-2, gross margin $5-10. Most Chinese factories operate on 30-40% gross margin.

Material Costs (40-50% of $25 = $10-12)

Material is the largest cost component. For a typical $25 mid-size PP case (35×25×15cm):

Resin (Outer Shell + Latches)

• PP resin (PP+GF for premium): $2-3 per case (50-70g at $4-5/kg)
• TPU gasket (compression seal): $0.50-1.00 per case
• ABS latches (4 latches): $0.50-1.00 per case
• PP hinge pins + steel rod: $0.20-0.40 per case
• Color masterbatch: $0.10-0.30 per case
• Subtotal resin: $3.50-5.50 per case

Foam Insert

• PU foam (50 kg/m³, ~250g): $3-5 per case
• PU foam (lower density, 35 kg/m³, ~300g): $2-3 per case
• EVA foam (cheaper): $1.50-2.50 per case

Other Materials

• Carton + foam corner protectors: $0.50-1.00 per case
• User manual + warranty card: $0.10-0.30 per case

Total materials: $5-12 per case (depending on quality tier)

Labor Costs (10-15% of $25 = $2.50-3.75)

Labor is the second-largest variable cost. For a Chinese factory with 100+ employees:

Production Labor

• Injection molding operator: $0.20-0.40 per case (1 operator, 60-120s cycle time)
• Foam cutting operator: $0.30-0.50 per case (CNC milling, ~5 min)
• Assembly operator: $0.40-0.60 per case (10-15 min: install gasket, foam, latches)
• QC inspector: $0.20-0.30 per case (visual + functional check)
• Packaging operator: $0.20-0.30 per case (bag, foam corners, carton, palletize)

Engineering Labor (Amortized)

• Industrial design: $0.10-0.20 per case (amortized over 10,000 pcs)
• Tool design + CNC machining: $0.30-0.50 per case (amortized over 10,000 pcs)
• QC engineering: $0.20-0.30 per case (amortized)
• Sample making: $0.10-0.20 per case (amortized)

Total labor (incl. engineering amortization): $2-4 per case

Overhead and Margin (30-40% of $25 = $7-10)

Factory Overhead (15-20% = $3-5)

• Factory rent (13,000㎡ at $2/㎡/month): $0.20 per case (amortized over 50,000 cases/month)
• Utilities (electricity, water, compressed air): $0.30 per case (injection molding is energy-intensive)
• Equipment depreciation: $0.50 per case (60+ machines, $20M total investment)
• Quality systems (ISO 9001, ROHS, test reports): $0.50 per case (amortized)
• Management + admin (15 people): $0.50 per case (amortized)
• Marketing + sales (3 people): $0.30 per case (amortized)

Margin (10-20% = $2-5)

• Net margin: $2-5 per case (10-20% of FOB price)
• Industry average: 15-25% gross margin, 5-10% net margin for Chinese factories
• KeXinMaterials margin: ~18% gross, ~8% net (after R&D, sales, marketing)

Hidden Costs to Watch

When comparing supplier quotes, ask about:

• Tooling cost (sometimes inflated; should be $3,000-$8,000 for a mid-size case)
• Sample cost (refundable against order; should be $50-$200)
• MOQ (some quote low but require 10,000+ MOQ; realistic is 300-500)
• Lead time (some quote 15 days; realistic for new tooling is 30-45 days)
• Payment terms (30% deposit + 70% before shipping is industry standard; some factories demand 50% deposit)
• Free tooling (only at 10,000+ pcs; otherwise paid)
• Free samples (some only at 5,000+ pcs; otherwise paid $50-$200 each)