07:15, before the rice goes on: two trays of salmon blocks come out of the 2 °C drawer, pads changed, probe into the thickest block reading 1.4 °C, time written on the whiteboard. By 11:30 the same blocks are portioned and on the counter, and the sheet under them has been changed twice. That rhythm, not the pad itself, is what an inspector will ask about.
Sushi prep is the hardest thawing environment in a restaurant, because the product is small, the turnover is fast, and the counter is warm. Pads here are part of a timing system, and the log beside them is the part that gets audited.
Why a small pad, changed often, beats a big one
A 2 kg salmon block at 200 gsm on a quarter-sheet pad is a completely different job from a 20 kg tray in a chiller. The block thaws in four to six hours at counter temperature, and the drip arrives in a concentrated patch under the belly side. A 400 gsm sheet in that position would still be half dry at the end of the day, and you would be paying for capacity you throw away.
Small sheets, 200 to 250 gsm, sized to the tray with no overhang, changed at the same time as the product rotation. Two changes across a service is normal. Three is a sign the counter is too warm.
The log fields that matter
- Time out of the freezer and product temperature at that moment.
- Pad change times, with initials. Two words, not a paragraph.
- Surface temperature of the block at portioning, not just the room.
- Discard or return time for anything not used by the end of the second service.
The pad change entry is the one inspectors read closely, because it is the only written evidence that someone was paying attention between 07:00 and 15:00. A log with perfect temperatures and no pad changes suggests a form filled in at the end of the day.
The counter-intuitive bit
In most sushi kitchens the pad is not there to protect the fish. It is there to protect the rice paper, the nori and the cutting board from a film of fish liquid that otherwise travels on hands and cloths. When a site switched to “no pad, wipe the tray” for a month, the fish was fine and the cross-contamination swabs went bad — because the wipe happened after portioning, not before.
The pad is a passive barrier. It keeps liquid in one place without anyone having to remember to intervene, which is exactly what you want at 11:40 when the counter is three orders deep.
A failure case with a familiar shape
A chain store ran one pad per tray for the whole day, 08:00 to 22:00, on the grounds that the trays were in a refrigerated well. By 18:00 the sheet under the tuna was spent, the surface was tacky, and portions were being lifted off a wet sheet onto the board. Nobody logged anything because nothing looked wrong: pads are white when new and only slightly grey when spent, and the gel had not broken.
The fix was a two-hour change timer on the prep phone and a simple line on the board. Compliance went from guesswork to routine in a week, and the fish stopped looking dull at the cut face by late service.
Where the two-hour figure comes from
Two hours is not a regulation; it is a working interval that suits a counter where product sits above 5 °C for part of the day and blocks are handled every few minutes. Shorter intervals mean more handling and more chances for a temperature excursion at the counter. Longer ones mean a spent sheet under product that is being cut.
Set the interval from your own measurements: probe a block at the start and end of a two-hour window, note how much the surface warms, and pick the interval that keeps the product inside your plan with a margin. Write the number down and put it on the board next to the timer, so the person changing the pad knows why the alarm is going off.
Small formats down to quarter-sheet are covered in the food-safe absorbent sheets range, because a counter pad that overhangs the tray is a wicking problem waiting for a busy service.
Keep the sheet on the tray, keep the timer on the phone, and keep the temperature probe within arm’s reach of both. If the pad change and the temperature check happen at the same moment, the log writes itself and the audit takes ten minutes instead of an afternoon.
Da maohua
Zhengzhou Flor New Materials Co., Ltd. specializes in SAP super‑absorbent polymer products. Serving personal hygiene, agriculture & horticulture, pet supplies and other industries, we leverage supply‑chain resources to provide particle‑size selection, performance matching and customized solutions based on clients’ practical requirements.
