Fillets on a Pad: What Drip Loss Costs You at the Weighing Table

Eighteen kilos of cod fillets go into the chiller at 06:40 on Tuesday, laid flat on pads at 2 °C. Wednesday at the same hour the tray weighs 17.1 kg. Nobody walked off with 900 grams. It left as drip, and where that water sat overnight decides whether the fish sells at full price or gets marked down before the first service.

Five percent is an ordinary figure for fillets frozen without a heavy glaze, and it is the number most kitchens never put on paper. The tray looks clean in the morning, the pad has done its quiet job, and nobody asks what the gap cost. Start weighing before and after a thaw and two things surface fast: the drip is bigger than anyone guessed, and no sheet of nonwoven was ever going to shrink it.

The pad does not stop drip. It stops the consequences.

Water leaves a fillet because freezing has already ruptured cell walls and the thaw gradient pulls the liquid out. A pad cannot reverse that physics. What it changes is where the water sits for the next twenty hours: locked inside a gel core, or spread under the product in a puddle two millimetres deep.

Standing drip is worse than it looks. The cut face reabsorbs liquid, goes pale and glossy, and puts on one to one and a half percent of weight. On the scale that reads as recovered yield, which is why some kitchens quietly prefer a wet tray. In the pan the same fillet weeps, the crust goes soft, and the portion collapses in front of the customer. Yield chased at the tray gets paid back at the pass.

Sizing the sheet to the load, not to the tray

Do the arithmetic before the order goes in. Eighteen kilos at five percent is 900 ml of drip across a 24-hour thaw, split over four GN 1/1 trays, so roughly 225 ml each. A 300 gsm sheet at 530 by 325 mm takes 1.1 to 1.4 litres before its face turns tacky, which leaves comfortable margin for a single cycle. A 150 gsm sheet in the same position runs out before the fillets are soft.

• 150-200 gsm: counter thaws of four to six hours, small pans, portion work.
• 250-300 gsm: overnight fillets, steaks and portioned poultry up to about 6 kg per tray.
• 400-500 gsm: loins, whole birds and any load above 8 kg, or any thaw beyond 36 hours.

The failure that gets blamed on the pad

A hotel kitchen ran a weigh-before, weigh-after sheet for three weeks and found fillets picking up 0.8 percent. The conclusion written on the clipboard was that the pads were adding water. What had actually happened was simpler: the sheets were undersized for the tray, the corners curled, and the fillets sat in their own drip from hour eight onward. The pad was not releasing water, it was failing to remove it.

The correction was a larger sheet and a solid tray underneath, nothing else. The gain disappeared, and the cooked fillets stopped shedding liquid on the plate. Worth saying plainly: a pad that looks wet and heavy at the end of a shift has done its job, and one that looks immaculate under a load that should have dripped is worth investigating.

What a percent is worth at your price

Fillets at 12.40 a kilo, 18 kg a day, 300 selling days. Five percent is 270 kg a year of paid weight that never reaches a plate, close to 3,350 at that price. Two 300 gsm sheets a day at around 0.22 each comes to roughly 130 a year. Arguing about the pad price while ignoring the tray is a strange way to spend an afternoon.

Ten fillets, weighed before and after the next thaw, will tell you more than any datasheet. Write both numbers down, note the tray type and the sheet size beside them, and repeat for a week. If the gap sits above six percent, look at glaze and freezing method before you look at absorbency; below three percent you are probably weighing after the surface has already dried. The sheet dimensions and grammage options that match standard pans are set out on the fresh-food absorbent pads pages, which saves a round of guessing when the trays are non-standard.

The two-minute check that saves a tray

Before the load goes in, run a finger along the tray floor where the sheet will sit. A burr, a dried piece of protein or a 1 mm lip is enough to hold the sheet off the surface and create a channel that water will use. A scraper and a cloth remove most of the causes of a wet corner that nobody can explain later.

Then look at the sheet itself. A pad that has been stored in a humid room for a month will feel limp and slightly cool before it has touched anything. Keep the carton closed, off the floor, and rotate stock so the box in use is the oldest one.

One practical rule to finish: product should never touch the tray floor, only the sheet, and the sheet should never be lifted mid-thaw to check underneath. Break the gel and you put the water back where you started.