What Is Rewet Rate?
Direct Answer
Rewet rate measures how much liquid returns to a diaper's surface under pressure after absorption — the lower it is, the drier the skin stays.
Key Takeaways
- Rewet rate measures how much liquid returns to a diaper's surface under pressure after absorption — the lower it is, the drier the skin stays.
- How it works: In testing, a set volume of liquid is poured into the diaper, then filter paper is pressed onto the surface under a standard weight; the weight gain of the paper is the rewet value.
- A diaper with rewet under 0.1g keeps skin notably drier than one with 0.3g+
- Myth: Fast absorption equals low rewet. Speed and rewet are different metrics; a fast core can still rewet if SAP retention is poor
How Rewet Rate Works
In testing, a set volume of liquid is poured into the diaper, then filter paper is pressed onto the surface under a standard weight; the weight gain of the paper is the rewet value. Lower rewet means the core locks liquid away even under a baby's weight. SAP content, core structure and topsheet design all affect rewet. It directly relates to skin dryness and rash prevention.
Examples and Applications
- A diaper with rewet under 0.1g keeps skin notably drier than one with 0.3g+
- High-quality SAP creates a strong gel that resists squeezing liquid back out (BASF)
Rewet Rate vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| Acquisition time | Rewet Rate | Acquisition time measures how fast liquid penetrates; rewet measures how much comes back under pressure |
Limitations and Common Misconceptions
- Myth: Fast absorption equals low rewet. Speed and rewet are different metrics; a fast core can still rewet if SAP retention is poor
- Myth: Rewet only matters at night. It matters whenever pressure is applied — sitting, crawling, sleeping
What is a good rewet rate for diapers?
Lower is better; premium diapers aim for minimal rewet (under ~0.1g in standard tests) to keep skin dry.
Why does rewet matter?
High rewet leaves skin wet, increasing irritation and diaper rash risk.
References
- BASF - Superabsorbents (HySorb / SAVIVA), how SAP works — BASF (accessed 2026-08-02)
- Pampers Official - What's in a Pampers diaper (component materials) — 品牌官方 (accessed 2026-08-02)