Open Ruiyi's grade index and you'll meet codes like RY-16-6, RY-15A-FS and RY-NTP60HL-D. They look cryptic until you see the pattern — then each code tells you the performance series, the binder and often the orientation before you open a datasheet. This guide decodes the system as it is used across the 51 published grades.
The ferrite pattern: series · binder suffix
Ferrite compound grades follow `RY-<series>-<binder>`. The numeric series tracks performance — higher numbers carry more magnetic output. The suffix names the matrix: `-6` is PA6, `-12` is PA12, and `-FS` marks the PPS family. So the three flavors of the RY-16 performance series are RY-16-6 (PA6, Br 240–250 mT), RY-16-12 (PA12, Br 255–264 mT) and RY-16-FS (PPS, Br 250–270 mT).
One nuance: a higher series number is a higher-performance *ferrite*, but comparing across binders still matters — the PPS grades trade some tensile strength for temperature capability, as covered in the binder guide.
The rare-earth pattern: system prefix · code
Rare-earth compounds switch to a letter prefix that identifies the magnetic system, followed by a numeric code and suffix letters that track the grade's position in the series:
| Prefix | System | Example grades |
|---|---|---|
| RY-NT | Isotropic NdFeB · PA12 | RY-NT210L, RY-NT240L, RY-NT280EL (10 grades) |
| RY-NTP | Isotropic NdFeB · PPS | RY-NTP30L … RY-NTP70L (8 grades) |
| RY-NY | Anisotropic NdFeB · PA12 | RY-NY2120L, RY-NY2140L |
| RY-NYP | Anisotropic NdFeB · PPS | RY-NYP90L … RY-NYP110L |
| RY-NSY | NdFeB + SmFeN hybrid · PA12 | RY-NSY2100L … RY-NSY2170L |
| RY-SY | SmFeN · PA12 | RY-SY2100L, RY-SY2120L |
| RY-SFY | SmFeN + ferrite · PA12 | RY-SFY230L … RY-SFY270L |
| RY-ST | Isotropic SmFeN · PA12 | RY-ST230L, RY-ST240L |
Full series list with grade counts: grade finder, series filter.
In the numeric body, the leading digits generally track magnetic output (for example RY-NT210L → RY-NT280EL steps up through the isotropic NdFeB range), and trailing letters mark variants within a code — density, loading or property tunings such as the `L`, `LB`, `CL` and `HL-D/-M` suffixes in the NdFeB families.
Reading a code in five seconds
- Starts with `RY-` + two digits, ends in `-6`, `-12` or `-FS` → ferrite compound; suffix = binder.
- Starts with `RY-N` → NdFeB-based (T = isotropic, Y = anisotropic; trailing P = PPS binder).
- Starts with `RY-S` → SmFeN-based (with `F` = SmFeN + ferrite blend; `RY-NSY` = NdFeB + SmFeN hybrid).
- Then check Br: every grade page leads with the Br window in both SI and CGS units.
Once you can read the codes, the fastest next step is the grade finder: filter by system and binder, shortlist two or three codes, and take them into the comparison view. If a code you need isn't in the published list, ask — customised grades are compounding business as usual.