What ppm is required for food contact surfaces?

UK food safety regulations typically require 200 ppm for quaternary ammonium sanitisers and sodium hypochlorite (bleach-based) on food contact surfaces. Peracetic acid is effective at lower concentrations, around 100-200 ppm. Always check the specific product data sheet for recommended use concentrations.

How do I convert percentage concentration to ppm?

To convert percentage to ppm, multiply the percentage by 10,000. For example, a 5% concentration equals 50,000 ppm. A 1% solution equals 10,000 ppm. When diluting to achieve a target ppm, you divide the target by the concentrate strength.

Do I need to rinse surfaces after sanitising?

It depends on the sanitiser type. Quaternary ammonium sanitisers at the correct dilution are generally no-rinse on food contact surfaces. Bleach-based sanitisers usually require a clean water rinse after the required contact time. Always follow the product label instructions.

How long should sanitiser be left on the surface?

Most sanitisers require a minimum contact time of 30 seconds to 5 minutes to be effective. Check the product data sheet for the specific kill time. The surface should remain visibly wet for the entire contact period — if it dries before the contact time is up, re-apply.

CleanCalcs

Sanitiser Dilution Calculator

Calculate the correct sanitiser-to-water ratio for food-safe surface cleaning.

Total Solution Needed

Total volume of diluted solution

Sanitiser Type

Concentrate Strength

Active ingredient % on label

Target Concentration

Required ppm for compliance

How We Calculate This

How the calculation works

This calculator converts between percentage concentration and parts per million (ppm) to determine the correct dilution.

Formula

Sanitiser volume = (target ppm ÷ 1,000,000) × total volume ÷ (concentration % ÷ 100)

Water volume = total volume − sanitiser volume

Common target concentrations

QAC: 150-400 ppm (typically 200 ppm for food surfaces)
Hypochlorite: 100-200 ppm for food surfaces
Peracetic acid: 100-200 ppm

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities and timings for your specific situation.