The Z446-MP-LID is the polycarbonate (PC) lid for the Hermle Z446-MP-BUK rectangular bucket on the Z446-750-AC 4-place swing-out rotor (Z446 / Z446-K chassis) — sold as a 2-pack. The lid engages the rectangular bucket's hermetic-seal mode for BSL-2 + biosafety workflows. The Z446-750-AC rotor takes 4 buckets × 1 lid each = 4 lids total for full hermetic configuration — buyer needs 2 packs of this SKU. Distinct from the Z446-750-LID (PC-Screw cap for the round bucket Z446-750-BUK) — the rectangular bucket and round bucket use different lid SKUs.
Key Specifications
| SKU | Z446-MP-LID |
| Type | Bucket lid — PC (polycarbonate) lid for rectangular bucket, hermetically sealed |
| Pack quantity | 2 lids per SKU (full 4-bucket configuration takes 2 units = 4 lids) |
| Compatible bucket | Z446-MP-BUK rectangular bucket only (round bucket Z446-750-BUK uses Z446-750-LID instead) |
| Compatible rotor | Z446-750-AC (4-place swing-out rotor body) — rectangular bucket configuration |
| Compatible chassis | Z446, Z446-K (refrigerated), and -E voltage variants |
| Hermetic seal rating | Per Z446-MP-BUK spec — rated to the rectangular bucket's full 3,130–3,961 × g maximum |
| Material | Polycarbonate (PC) — chemical-resistant, autoclavable |
| List price | $121 (2-pack) |
Compatibility & When to Order This SKU
This SKU activates hermetic-seal capability on the Z446-MP-BUK rectangular bucket. Order Z446-MP-LID when at least one of the following applies:
- Commissioning a Z446-MP rectangular-bucket hermetic-seal configuration — order 2 units for full 4-bucket hermetic capability (4 lids).
- Adding biosafety capability to an existing Z446 / Z446-K + Z446-MP-BUK install that currently runs in non-sealable mode.
- BSL-2 + microplate workflows — when microplate-direct workflows on the rectangular bucket handle potentially infectious patient samples requiring aerosol containment during the spin step.
- BSL-2 + 15 mL conical or 50 mL conical workflows on the rectangular-bucket inserts (Z446-750-B15, Z446-750-B50) requiring hermetic containment.
- Replacement lids if a current set is damaged or worn.
Round Bucket vs Rectangular Bucket Lid Distinction
The Z446-750-AC swing-out rotor accepts two bucket profiles, each with its own lid SKU and adjacent bucket-handling SKU:
| Bucket | Lid SKU | Bucket handling aid |
| Z446-MP-BUK (rectangular) | Z446-MP-LID (this product) | Z446-MP-RA (removing aid) |
| Z446-750-BUK (round) | Z446-750-LID | (no specific removing-aid SKU) |
The lids are not interchangeable. The rectangular-bucket configuration also has a dedicated removing-aid SKU (Z446-MP-RA) for handling the bucket+lid+plate stack at the bench.
Application Profile
Cold-chain BSL-2 + microplate workflows — when microplate-format clinical-research workflows (ELISA, immunoassay wash spins, cell-culture plate prep) handle potentially infectious patient samples and require both refrigeration AND aerosol containment.
Cold-chain BSL-2 + 15 mL conical workflows on rectangular bucket — when the lab uses the B15 insert (17 × 15 mL conical, 68/cycle) on the rectangular bucket for clinical-research workflows requiring biosafety containment.
Cold-chain BSL-2 + 50 mL conical workflows on rectangular bucket — when the lab uses the B50 insert (7 × 50 mL conical, 28/cycle) on the rectangular bucket for clinical-research workflows requiring biosafety containment.
Recombinant-protein and bioprocess prep at BSL-2 in microplate or rectangular-bucket-insert format — recombinant-protein workflows handling genetically modified organisms in plate-format or rectangular-bucket-compatible tube formats with required aerosol containment.
Cross-format BSL-2 Z446-K core facilities — shared cores running both rectangular-bucket workflows (microplate, B15, B50) and round-bucket workflows (A* insert family) benefit from stocking both lid SKUs.
Ordering & Configuration
Hermetic-seal engagement. Per Hermle service instructions, the Z446-MP-LID must be fully engaged on each rectangular bucket before each spin to maintain the hermetic envelope at the rectangular bucket's max RCF.
Lid-bucket compatibility. The Z446-MP-LID is engineered specifically for the Z446-MP-BUK rectangular bucket. Confirm bucket inventory before ordering lids; round buckets (Z446-750-BUK) require the Z446-750-LID instead.
Z446-MP-LID ships as 2 lids.
Required for operation:
- Z446-MP-BUK rectangular buckets (sold separately) — 4 buckets needed for full configuration
- Z446-750-AC rotor body (sold separately) or already in inventory
- For full 4-bucket hermetic configuration: 2 units of this LID SKU
- Optional: Z446-MP-RA (removing aid) for handling the bucket+lid stack ergonomics
Confirm at quote: bucket pairing (Z446-MP-BUK rectangular bucket in inventory; round bucket uses Z446-750-LID instead), chassis pairing (Z446 or Z446-K), insert family or microplate workflow, lid count needed (2 packs for full 4-bucket configuration), workflow biosafety driver, and lead time.
Warranty: 5-Year Hermle warranty (3 years full + 2 years drivetrain) on the lids. The hermetic-seal interface is a planned-inspection item for biosafety workflows.
Z446-MP rectangular-bucket procurement family:
- Z446-MP-LID (this product) — PC lid for hermetic seal on Z446-MP-BUK
- Z446-MP-BUK — rectangular bucket (sold separately)
- Z446-MP-RA — removing aid for the rectangular bucket / bucket+plate stack ergonomics
- Z446-MP-STK — PCR stacking adapter for Z446-750-MP microplate carrier
- Z446-750-B15 / B50 — direct-fit inserts for the rectangular bucket
The Z446-MP-LID activates BSL-2 + biosafety mode on the rectangular-bucket configuration of the Z446-750 swing-out rotor.
