Scrap Inventory Management: A Practical Guide for Manufacturing SMEs

Scrap is easy to ignore because it often sits in a corner of the factory. But financially, scrap is rarely small.

Every offcut, rejection, excess material, damaged component, process loss, and reusable leftover tells a story. It may point to poor cutting plans, wrong material issue, quality problems, machine settings, operator training gaps, weak BOM accuracy, or simple lack of control.

For manufacturing SMEs, scrap inventory management is not only about selling waste. It is about understanding why scrap is generated, how much value is locked in it, whether it can be reused, and how it affects costing and margins.

This guide explains scrap inventory management, types of scrap, process controls, reporting, common mistakes, and how AICAN Optiwise helps manufacturers connect scrap with inventory, production, quality, and costing.

Note: This article is for general operational and business understanding only. Accounting, tax, GST, environmental, safety, and regulatory treatment of scrap may vary. Please consult qualified professionals for specific advice.

What Is Scrap Inventory Management?

Scrap inventory management is the process of identifying, recording, storing, valuing, reusing, selling, or disposing of scrap generated during business operations.

In manufacturing, scrap may come from:

• cutting or trimming
• machining loss
• rejected parts
• damaged raw material
• obsolete stock
• excess issue
• process wastage
• packaging waste
• trial production
• rework failure

The goal is to make scrap visible and controlled.

Types of Scrap

Process Scrap

Scrap generated naturally during production, such as cutting loss, machining chips, or trimming waste.

Rejection Scrap

Material or components rejected due to quality failure.

Reusable Scrap

Material that can be reused in another job or process.

Saleable Scrap

Scrap that can be sold to scrap dealers or recyclers.

Hazardous or Controlled Scrap

Scrap that requires special handling due to safety, environmental, or regulatory reasons.

Obsolete Scrap

Old or unusable inventory that no longer has operational value.

Why Scrap Management Matters

Scrap affects more than housekeeping.

It impacts:

• material cost
• production yield
• quality performance
• inventory accuracy
• costing
• cash recovery
• compliance
• factory space
• loss prevention
• customer profitability

If scrap is not recorded, actual material consumption looks unclear and product costing becomes unreliable.

Scrap Management Process

1. Identify Scrap at Source

Scrap should be identified where it is generated: cutting, machining, assembly, inspection, stores, or dispatch.

2. Classify Scrap

Classify whether it is reusable, saleable, rejection, hazardous, or obsolete.

3. Measure Quantity

Use weight, count, length, area, or other suitable unit depending on material type.

4. Record Reason

Capture why scrap was generated: process loss, wrong setting, quality rejection, customer change, damage, or excess issue.

5. Store Separately

Scrap should be stored by type to avoid mixing reusable and non-reusable material.

6. Approve Reuse, Sale, or Disposal

Define authority for reuse, sale, write-off, or disposal.

7. Reconcile and Report

Compare expected scrap with actual scrap and review abnormal losses.

Example in Manufacturing

A sheet metal manufacturer issues 1,000 kg of steel sheets for production. After cutting, 850 kg becomes usable parts, 90 kg becomes planned offcut, and 60 kg becomes abnormal scrap due to wrong nesting or machine setting.

If the company records only total issue, it may not know whether the loss was expected or avoidable.

Scrap inventory management helps separate normal process loss from avoidable waste.

Scrap and Product Costing

Scrap affects costing in two ways.

First, high scrap increases material cost per finished unit. Second, saleable scrap may recover some value. If both are not tracked, product margins may look better or worse than reality.

A manufacturer should understand:

• expected scrap percentage
• actual scrap percentage
• scrap recovery value
• reason for abnormal scrap
• customer or product-wise scrap trend

This is especially important for metal, plastic, textile, packaging, fabrication, and machining industries.

Common Scrap Management Mistakes

Scrap Is Not Recorded

If scrap is physically present but absent from records, inventory control becomes weak.

All Scrap Is Treated the Same

Reusable scrap, rejection scrap, and saleable scrap need different treatment.

No Reason Codes

Without reason tracking, the business cannot reduce scrap.

No Link With Production Order

Scrap should be traceable to job, product, machine, or batch where possible.

Sale Proceeds Are Tracked but Quantity Is Not

Money from scrap sale may be recorded, but operational loss remains invisible.

No Approval for Disposal

Uncontrolled scrap disposal can create leakage and compliance risk.

How ERP Helps Scrap Inventory Management

ERP helps bring scrap into the same control system as inventory and production.

A connected ERP can:

• record scrap against production orders
• classify scrap type
• track reusable and saleable scrap
• update inventory records
• capture rejection reasons
• support stock adjustment approvals
• show scrap trend reports
• help compare expected vs actual consumption
• improve costing visibility

Optiwise by AICAN helps manufacturing SMEs track material movement, production output, rejection, and inventory so scrap becomes visible and manageable.

Scrap KPIs to Track

Useful scrap KPIs include:

• scrap quantity by material
• scrap value by month
• scrap percentage by product
• rejection scrap by reason
• scrap by machine or process
• reusable scrap consumed
• saleable scrap recovered
• abnormal scrap trend

These reports help owners see where money is leaking.

Best Practices

Define scrap categories.

Record scrap at the point of generation.

Use reason codes.

Separate reusable and saleable scrap.

Link scrap to production orders where possible.

Review abnormal scrap regularly.

Control scrap sale and disposal approvals.

Use reports to improve process, not only to maintain records.

Founder’s Note

At AICAN, we have seen factories where scrap is treated as unavoidable background noise. But when scrap becomes visible, it often reveals process improvement opportunities that were hidden in plain sight.

AICAN Optiwise helps manufacturers connect inventory, production, rejection, and reporting so scrap is not just collected, but understood.

FAQs

What is scrap inventory management?

It is the process of identifying, recording, classifying, storing, reusing, selling, or disposing of scrap generated in operations.

Why is scrap management important?

It improves costing, inventory accuracy, quality control, loss prevention, and material efficiency.

What is the difference between reusable and saleable scrap?

Reusable scrap can be used again in production. Saleable scrap is usually sold externally for recovery value.

Should scrap be linked to production orders?

Yes, where possible. It helps identify which product, job, machine, or process generated the scrap.

How does Optiwise help manage scrap?

Optiwise by AICAN helps connect inventory, production, rejection, material movement, and reports so scrap can be tracked and reduced.