A super absorbent diaper core manufacturer controls the SAP load, the acquisition layer, and the rewet — the three things that decide how much a diaper holds under a baby's weight. Day cores run about 6–9 g SAP; overnight cores 10–14 g. AUL (absorption under load) and rewet are the two numbers worth writing into your spec and sampling mid-batch.
The core is where the product is won
A super absorbent diaper core manufacturer lives or dies on three layers: the acquisition layer that pulls fluid in fast, the distribution layer that spreads it, and the SAP (super absorbent polymer) that locks it as gel. The SAP technical spec page breaks down what "high-quality SAP" actually measures.
SAP grams: day versus night
Day cores carry roughly 6–9 g of SAP per diaper; overnight cores 10–14 g. More SAP is not automatically better — too much gel blocks the acquisition layer. The absorbency science page explains the hold-vs-speed trade-off in plain language.
AUL and rewet: the two numbers to spec
AUL (absorbency under load) tests how much the core holds while a baby lies on it. Rewet tests how much fluid comes back to the skin after compression. Both belong in your purchase spec. The leak-prevention guide shows how core and cuff work together; the leg-cuff engineering page covers the seal that stops side leaks.
Prove it on the line, not just in a sample
A factory with an in-house lab can run AUL and rewet on a mid-batch sample, catching drift before a container ships. The how-diapers-are-made guide shows where the core is built on the line.
Buying the core as an OEM spec
If you private-label, set the SAP load and rewet in your spec and sample against them. The low-MOQ budget guide helps size a first order that still hits your absorbency target.
Five questions on the absorbent core
Q: How much SAP in an overnight diaper?
A: Roughly 10–14 g; day cores run 6–9 g.
Q: What is AUL?
A: Absorption under load — how much the core holds while compressed by the baby's weight.
Q: Why does rewet matter?
A: It measures fluid returning to skin; lower rewet means drier skin.
Q: More SAP = better?
A: Not past a point; excess gel slows acquisition and can feel lumpy.
Q: How do I verify the core?
A: Sample mid-batch and test AUL/rewet in the factory lab.
Editorial transparency
Technical buyer note, not a ranking. SAP and AUL ranges are typical; confirm against your spec and market rules.
Related: hypoallergenic bulk, eco biodegradable core, and the overnight bulk OEM hub.
