Pharmaceutical Quality Control & GMP Release, USP <1216> Uncoated Tablet Friability
USP <1216> Tablet Friability & Sample Size Formula
Calculate Harmonized USP <1216> Minimum Tablet Count (6.5 g vs 10-Tablet Rule), 100-Drop Abrasion Mass Loss (mg), Percentage Friability (%), and <=1.0% GMP Release Gate.
Counting 10 small 200 mg tablets violates harmonized USP <1216>—and losing over 1.0% edge dust inside the 283 mm drum blocks pan-coating release!
Uncoated pharmaceutical tablets tumbled inside high-shear perforated coating pans or blister-pack feeders chip and dust unless mechanical edge strength passes harmonized **USP `<1216>` / Ph. Eur. `2.9.7` / JP Tablet Friability** (`100` revolutions at `25 ± 1` RPM = `4` minutes inside a `283–291` mm acrylic scoop drum dropping tablets `156` mm onto the curved baffle every turn!). First, the compendial **Sample-Size Rule** branches strictly at **`650` mg unit tablet weight**: for tablets **`<= 650` mg**, weigh a whole-tablet sample as close as possible to **`>= 6.5` g** (`ROUNDUP(6,500 / W_{unit,mg}, 0)` tablets!); for large caplets **`> 650` mg**, test exactly **`10` whole tablets**! After careful air-jet dedusting before (`W_{init}` g) and after `100` drops (`W_{final}` g), **Friability `%Loss = ((W_{init} - W_{final}) / W_{init}) * 100%`** MUST NOT exceed **`1.0%`** (with zero cracked, cleaved, or capped tablets)!
Verify on a `420` mg Uncoated Ibuprofen Core Lot—Nominal_Unit_Tablet_Mass = 420.0 mg (B2 -> `<= 650` mg rule requires `ROUNDUP(6500 / 420, 0) = 16` tablets in E2!), Dedusted_16-Tablet_Initial_Mass `W_{init}` = 6.725 g (B3), and Post-100-Drop_Dedusted_Mass `W_{final}` = 6.682 g (B4): Abraded Dust Loss equals `43.0` mg (E3), Friability equals `0.639% <= 1.0%` (E4), certifying `"USP <1216> FRIABILITY PASS"` (E5)! In a shared GMP batch-record workbook, QC analysts can attach instrument `.csv` balance logs as non-executing excerpts while QA reviewers `owner`/`editor` verify `E5` before signing lot disposition.
| Harmonized USP <1216> Friability KPI (420 mg Core, W_init=6.725 g, W_final=6.682 vs 6.638 g) | Formula | Verified Output |
|---|---|---|
| Compendial Minimum Tablets | IF(Unit_mg <= 650, ROUNDUP(6500/Unit_mg, 0), 10) | 16 tablets (>= 6.5 g harmonized rule) |
| 100-Drop Abraded Mass Loss (mg) | (Initial_Weight_g - Final_Weight_g) * 1000 | 43.0 mg (87.0 mg @ over-dried granulation!) |
| Tablet Friability Loss (%) | ((W_init_g - W_final_g) / W_init_g) * 100 | 0.639% (1.294% > 1.0% limit!) |
| USP <1216> Release Disposition | Friability_Pct <= 1.0% Compendial Ceiling | USP <1216> FRIABILITY PASS |
Harmonized USP <1216> / Ph. Eur. 2.9.7 Sample-Count & 1.0% Release Formula
Validate `Unit_Mass` in `[25, 3,000]` mg, `Initial_Weight W_{init} >= 5.0` g, and `0.80 * W_{init} <= W_{final} <= W_{init}` right on `E2` (checking `ISTEXT(E2)` on `E3..E4` so `E5` disposition text stays decoupled)!
=LET(um_m, B2, wi_g, B3, wf_g, B4, fr_p, ((wi_g - wf_g) / wi_g) * 100, IF(OR(um_m < 25, um_m > 3000, wi_g < 5, wf_g > wi_g, wf_g < 0.8 * wi_g), "Invalid Friability Input", IF(fr_p <= 1, "USP <1216> FRIABILITY PASS", "REJECT (>1.0% LOSS OR CAPPING)")))Over-Dried Low-Moisture Granulation (`W_final = 6.638` g -> `1.294%`) Lot Rejection Check (Set B4 = 6.638 g)
Over-dry fluid-bed granules below `1.0%` LOD so edges chip inside the Roche drum (`W_{final}` B4 = 6.638 g): Mass Loss E3 doubles to `87.0` mg and Friability E4 climbs to **`1.294%`** (`> 1.0%`!), triggering `"REJECT (>1.0% LOSS OR CAPPING)"` in E5!
=IF(ISTEXT(E2), E2, ROUND(((B3 - B4) / B3) * 100, 3))Try the example
Use the original values or change them to test your understanding.