The Z600-OL-PTC is the felt-cushion adapter that pairs with the Z600-OL-PT ASTM pear-shaped oil test tube on the Hermle OLEUM Oil-Test Centrifuge (Z600-OL chassis) — sold as a 2-pack. The adapter seats the glass pear-shaped oil-test tube into the Z600-OL-BUK round bucket; the felt-cushion material protects the glass tube against impact and vibration during centrifugation while ensuring the tube sits at the correct depth and orientation for protocol-compliant ASTM oil-testing analysis. Sister adapter to the Z600-OL-CTC (conical-tube adapter) — the two adapters serve different ASTM tube geometries on the same OLEUM rotor.
Key Specifications
| SKU | Z600-OL-PTC |
| Type | Felt-cushion adapter — for ASTM pear-shaped oil test tube |
| Pack quantity | 2 adapters per SKU (full 4-bucket configuration takes 2 units = 4 adapters) |
| Tube format paired | Z600-OL-PT (ASTM pear-shaped oil test tube, sold separately) |
| Compatible bucket | Z600-OL-BUK (round bucket on the OLEUM rotor) |
| Compatible chassis | Z600-OL OLEUM Oil-Test Centrifuge (230 V) |
| Workflow standards | ASTM D2273 (trace sediment in lubricating oils — pear-shaped tube preferred for very low sediment volumes); also applicable to ASTM D96 and D4007 protocols when pear-shaped geometry is specified |
| Z600-OL host chassis specifications | 4-place swing-out, 3,000 rpm max speed, 2,213 × g max RCF, 22 cm max radius |
| List price | $271 (2-pack) |
Compatibility & When to Order This SKU
Adapter pairing — ASTM pear-shaped oil test tube workflow on OLEUM only. Order this SKU when:
- Initial pear-shaped workflow setup — when commissioning an OLEUM Oil-Test Centrifuge for ASTM pear-shaped-tube workflows, order 2 packs (4 adapters) for full 4-bucket configuration.
- Workflow-recurring replacement — felt-cushion material is a wear item; replace the adapter set when felt cushion shows visible degradation.
- High-quality lubricating-oil testing labs — ASTM D2273 trace-sediment workflows on premium lubricating oils that specify pear-shaped tube geometry.
- Mixed conical / pear-shaped workflow — when the lab runs both ASTM tube formats per protocol requirements, stock both adapter formats (CTC + PTC).
Conical vs Pear-Shaped Adapter — Different Tube Envelopes
The OLEUM workflow supports two ASTM tube geometries with separate felt-cushion adapter SKUs:
| Adapter | Tube format paired |
| Z600-OL-PTC (this SKU) | Pear-shaped (Z600-OL-PT) |
| Z600-OL-CTC | Conical (Z600-OL-CT) |
The pear-shaped tube has different shoulder and tip geometry than the conical tube; the felt-cushion adapter is dimensioned to match the specific tube format. Using the wrong-format adapter risks tube fit problems and balance issues during high-RCF operation.
Why a Felt-Cushion Adapter for Pear-Shaped Glass Tubes
ASTM oil test tubes are glass (per ASTM protocol for chemical compatibility with petroleum solvents). The felt-cushion adapter:
- Protects the glass tube from direct contact with the metal bucket interior
- Damps vibration during the spin cycle, reducing stress on the tube structure (critical for the pear-shaped tube's narrow tip which is more fragile than the conical-tip geometry)
- Ensures correct tube positioning at the correct depth for protocol-compliant analysis (graduated scale alignment, pear-tip-position consistency for trace-sediment volumetric measurement)
The adapter is a workflow-recurring replacement item — typical OLEUM operation will see felt-cushion replacement on the manufacturer-recommended service interval.
Application Profile
ASTM D2273 trace-sediment analysis on premium lubricating oils — automotive premium-oil quality testing, marine premium-oil testing, industrial-machinery premium-oil testing.
Lubricating-oil manufacturer quality-assurance — lubricating-oil manufacturer QC labs running pear-shaped-tube ASTM analysis on outgoing-product samples.
Refinery quality-control on premium fuel products — petroleum-quality testing on premium fuel grades where trace-sediment limits are tight.
Educational and training petroleum-engineering programs — petroleum-engineering curricula teaching ASTM oil-testing methodology that includes pear-shaped tube geometry.
Mixed-format OLEUM operation — labs running both conical and pear-shaped workflows benefit from spare adapter inventory for rapid format-switching.
Ordering & Configuration
4-bucket symmetric loading. All 4 buckets must use matching Z600-OL-PTC adapters for symmetric balance.
Felt cushion inspection. Inspect felt cushion before each cycle — the cushion should be intact, dry (not soaked with oil), and seated correctly in the bucket envelope. Replace when cushion shows wear, contamination, or compression.
Tube cap / stopper confirmation. ASTM pear-shaped tubes are typically capped per ASTM protocol before centrifugation; confirm cap integrity before each spin.
Z600-OL-PTC ships as 2 felt-cushion adapters. ASTM pear-shaped oil test tubes (Z600-OL-PT) and Z600-OL-BUK round buckets are sold separately.
Confirm at quote: chassis pairing (Z600-OL OLEUM in inventory), workflow protocol (ASTM D2273 trace-sediment or other pear-shaped-tube protocol), tube format (ASTM pear-shaped, pairs with Z600-OL-PT), pack count (2 packs for full 4-bucket configuration), and lead time.
Warranty: 5-Year Hermle warranty (3 years full + 2 years drivetrain) on the adapters. Felt-cushion material is a planned-replacement workflow item — confirm replacement scope at order.
OLEUM Oil-Test Centrifuge tube and adapter family (Z600-OL chassis):
- Z600-OL-PTC (this product) — Felt-cushion adapter for ASTM pear-shaped oil test tube
- Z600-OL-PT — ASTM pear-shaped oil test tube (each, glass)
- Z600-OL-CTC — Felt-cushion adapter for ASTM conical oil test tube
- Z600-OL-CT — ASTM conical oil test tube (each, glass)
- Z600-OL-BUK — Round bucket for OLEUM rotor
- Z600-OL-INS — Bottom insert for round bucket
- Z600-OL-COM — Complete OLEUM bundle (chassis + buckets + inserts)
Pair the Z600-OL-PTC with the Z600-OL-PT pear-shaped tube for ASTM pear-shaped workflows; pair the Z600-OL-CTC with the Z600-OL-CT conical tube for ASTM conical workflows.
