How do you calculate adhesive changeover time?

Divide the number of changeovers by your completion pace in changeovers per minute to get base time, then multiply by one plus the purge and cleaning allowance. With 7 changeovers at 0.06/min and a 40% allowance, base time is 116.67 hours and total workload is 163.33 hours.

Why does adhesive changeover take so long?

Reactive adhesives must be purged from mix heads and lines before the next product, or cured residue ruins the bond. That purge and clean is why the pace looks slow, only 0.06 changeovers per minute in the example, and why a 40% allowance is realistic.

What is the purge and cleaning allowance?

It is the percentage uplift covering line flushing, mix-head cleaning, and solvent or material purge that the raw changeover pace does not include. A 40% allowance on 116.67 base hours adds 46.67 hours to reach 163.33 hours.

How can I reduce adhesive changeover time?

Batch same-adhesive jobs to cut the changeover count, apply SMED to externalize cleaning, or use quick-disconnect cartridges and disposable static mixers. Cutting changeovers from 7 to 4 at the same pace would drop base time from 116.67 to about 66.67 hours.

What is a good changeover completion pace?

It depends entirely on the dispensing system and adhesive, but two-part metered systems are slow because of purge requirements. The 0.06 changeovers/min default means roughly 16.7 minutes of base time per changeover before the cleaning allowance is added.

Does changeover time count as downtime?

Yes. It is non-value-added time when the line is not producing bonded parts, so it directly reduces availability in OEE. The 163.33-hour result is downtime you should subtract from scheduled production capacity.

Adhesives, Sealants & Industrial Bonding calculator

Adhesive Changeover Time Calculator

Adhesive Changeover Time estimates the labor hours lost to switching adhesives or sealants on a dispensing line, including the purge and cleaning that protects the next bond from cross-contamination. Production planners and continuous-improvement engineers use it because changeovers are pure non-value-added time that quietly erodes line availability, especially with reactive two-part systems that gum up lines if not flushed. By pairing a realistic changeover pace with a purge and cleaning allowance, the number reflects the true downtime, not the optimistic version. That makes it a frontline target for SMED and scheduling decisions like batching same-adhesive runs together.

What this calculator does

Estimate adhesive changeover workload from changeovers, changeover throughput, and purge/cleaning allowance.
a production scheduler needs to plan downtime for adhesive or sealant changeovers
It computes total adhesive changeover labor hours by dividing changeovers by your completion pace, then adding a purge and cleaning allowance.

Formula used

Base changeover time = adhesive changeovers ÷ changeover completion pace
Adhesive changeover workload = base changeover time × (1 + purge/cleaning allowance)

Inputs explained

Adhesive changeovers:
Changeover completion pace:
Purge/cleaning allowance:

How to use the result

Use it when sequencing a production schedule, running a SMED study, or estimating the downtime cost of frequent adhesive switches.
The allowance is a flat uplift, so it does not capture long fixed flush cycles or cured-material clean-outs that take the same time regardless of changeover count.

Current U.S. benchmarks

The producer price index for industrial chemicals stands at 344.336 (BLS, May 2026), up 16.1% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 11,391 plastics and rubber products establishments employing about 815,988 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate adhesive changeover time? Divide the number of changeovers by your completion pace in changeovers per minute to get base time, then multiply by one plus the purge and cleaning allowance. With 7 changeovers at 0.06/min and a 40% allowance, base time is 116.67 hours and total workload is 163.33 hours.
Why does adhesive changeover take so long? Reactive adhesives must be purged from mix heads and lines before the next product, or cured residue ruins the bond. That purge and clean is why the pace looks slow, only 0.06 changeovers per minute in the example, and why a 40% allowance is realistic.
What is the purge and cleaning allowance? It is the percentage uplift covering line flushing, mix-head cleaning, and solvent or material purge that the raw changeover pace does not include. A 40% allowance on 116.67 base hours adds 46.67 hours to reach 163.33 hours.
How can I reduce adhesive changeover time? Batch same-adhesive jobs to cut the changeover count, apply SMED to externalize cleaning, or use quick-disconnect cartridges and disposable static mixers. Cutting changeovers from 7 to 4 at the same pace would drop base time from 116.67 to about 66.67 hours.
What is a good changeover completion pace? It depends entirely on the dispensing system and adhesive, but two-part metered systems are slow because of purge requirements. The 0.06 changeovers/min default means roughly 16.7 minutes of base time per changeover before the cleaning allowance is added.

Last reviewed 2026-05-12.