Where Pads Sit on a HACCP Flow Diagram

Two auditors, two sites, same month. At the first, the thawing pad appeared nowhere in the flow diagram and the audit passed, because the site described it accurately as packaging. At the second, the pad was drawn in as a critical control point with a limit of “pad visibly clean”, and the audit took four hours longer than it needed to.

Where a pad belongs on a flow diagram is a small question with a large failure mode. Get it wrong in the ambitious direction and you invent a control you cannot monitor. Get it wrong in the lazy direction and you have an unrecorded step that touches food contact surfaces.

Start with the hazard, not the product

Walk the thaw step and ask what can go wrong. Product thaws at the wrong temperature, so pathogens multiply. Drip from raw product crosses to ready-to-eat product. Drip accumulates and becomes an aerosol or a hand-transfer route. Those three hazards exist with or without a pad.

The pad’s role is narrow and real: it removes standing liquid from the product’s immediate environment, which reduces splash, reduces hand and cloth transfer, and stops the tray becoming a reservoir. It does not kill anything, does not control temperature, and does not replace separation.

Draw it as a support, not a step

The cleanest diagrams place the pad inside the thaw process step as an control measure supporting the separation control, not as a separate box on the line. That keeps the diagram honest: the process step is thawing, the hazard is cross-contamination and growth, and the pads are one of the measures that keep the hazard in check alongside temperature, time and physical separation.

What you write against it should be monitorable in ten seconds at the tray:

• What: one sheet per tray, correct grammage for the load, full floor coverage, no overhang.
• How often: checked at loading and at every change point on the thaw card.
• By whom: named role, not “kitchen staff”.
• What counts as a fail: a spent sheet at the change point, product touching the tray floor, liquid at the tray corner.
• What happens then: change the sheet, re-check the tray, record it.

The counter-intuitive finding from the second audit

The site that made the pad a CCP had no way to verify it. “Visibly clean” is not a limit; it is an opinion. The auditor’s finding was not that the control was wrong but that it was unverifiable, which is worse — it turned a well-run thaw room into a documentation problem.

Demoting the pad to a support measure, with a written check and a change frequency, closed the finding in a week. The thaw room did not change at all. Only the diagram caught up with reality.

What belongs in the verification file

Three things, and no more. A specification for the sheet that states food-contact compliance, grammage and dimensions. A record showing that the stated change frequency is actually being met, which is the tray card or the log, not a policy. And a short note on disposal, because an auditor who sees a pad in the process will eventually ask where it goes.

Keep the language plain: “absorbent sheet, single use, food-contact grade, changed at 12 hours or when the face is tacky”. That sentence survives a challenge far better than a two-page procedure nobody reads at 05:30.

One document question that comes up in every audit: does the sheet have a food-contact declaration, and is it on file at the site rather than at head office? A declaration in a folder three hundred kilometres away is not available to the auditor standing in your thaw room. Keep a copy in the site file with the current delivery note, and make sure the batch or lot number on the carton can be traced to it.

That is the whole of the pad’s paperwork burden: a specification, a declaration, a delivery record and a line in the daily check. Sites that add more than that usually end up with a procedure nobody follows and a corrective action about records that do not reflect practice.

The paperwork that belongs in the site file — food-contact declaration, grammage, dimensions — is described alongside the pad specification documents, and it is worth having a printed copy in the thaw room rather than a link in an email.

One last practical point: if pads are stored in the thaw room, they need to be in a closed container off the floor. An open bag of sheets on a shelf next to raw product is the kind of detail that turns a passing audit into a corrective action, and it takes thirty seconds to fix before the auditor arrives.