Biopsy Cassettes, PP, White — 258-4249-H90 | 500/Bag | Caplugs® Evergreen

Biopsy Cassettes with Covers, 1.0 mm Holes, Acetal (POM), Gray — 258-4249-H90 | 500/Bag

Technical Narrative

The Caplugs® Evergreen is a gray Acetal (POM) biopsy cassette with 1.0 mm holes for small tissue fragment retention during automated tissue processing. Gray acetal cassettes are commonly used for prosthetic valve, hard tissue, or decalcification specimens — workflows where a visually distinct neutral-tone cassette helps differentiate processing-intensive specimens from routine soft tissue batches. The 1.0 mm aperture retains needle cores, GI mucosal fragments, and other small specimens that would pass through standard 1.5–2.0 mm cassette holes during xylene clearing. Acetal's crystalline POM matrix delivers superior xylene resistance and dimensional stability versus PP, maintaining hole geometry through aggressive processing cycles.

Acetal (POM) outperforms PP in prolonged xylene exposure, rapid cycle processor agitation, and sustained 65°C paraffin wax infiltration — making it the preferred cassette material for high-volume small biopsy programs where PP hole enlargement and dimensional creep increase fragment loss risk over time. The gray pigmentation is polymer-matrix compounded — not a surface coating — ensuring color permanence through the full processing solvent sequence.

At $140.54 per 500/Bag — $0.2811 per cassette — the delivers acetal-grade fragment security in the gray color designation. Also available: 258-4247-W90 (Acetal White, $140.54/Bag); 258-4248-G90 (Acetal Turquoise, $140.54/Bag).

Technical Specifications — Caplugs® Evergreen

Small Biopsy Processing Compatibility —

The 1.0 mm hole format is the clinical standard for small tissue fragment retention:

For sub-millimeter fragments, pair with tissue biopsy foam pads as secondary containment inside the cassette.

Chemical & Processing Compatibility — Acetal (POM)

Acetal (POM) provides superior xylene and solvent resistance versus PP — the preferred material for demanding processing protocols.

Anatomic Pathology Laboratory Applications

The serves anatomic pathology programs processing prostate needle cores, GI endoscopic biopsies, cervical and endocervical biopsies, hepatic and renal needle biopsies, hard tissue and decalcification specimens, and any small tissue fragment protocol where 1.0 mm hole aperture is required for fragment retention.

U.S. Manufacturing, Quality & Institutional Procurement

Every Caplugs® Evergreen lot is precision-molded at our California manufacturing facility and subject to rigorous dimensional inspection and material purity verification. We supply hospital systems, reference laboratories, and federal procurement offices under institutional pricing programs with blanket-order support and same-day shipping on stocked inventory. Request a compatibility sample below to validate fit with your protocol before committing to volume.

Frequently Asked Questions — Caplugs® Evergreen

When should I choose gray cassettes over white or turquoise?

Color selection is protocol-driven. Gray acetal cassettes are commonly used for prosthetic valve, hard tissue, or decalcification specimens — workflows where a visually distinct neutral-tone cassette helps differentiate processing-intensive specimens from routine soft tissue batches. The choice between gray , white (258-4247-W90), and turquoise (258-4248-G90) does not affect cassette performance — all are identical Acetal (POM) with 1.0 mm holes. Select color based on your laboratory's color-coding protocol for specimen type or processing category designation.

Why use Acetal (POM) for small biopsy cassettes?

Acetal's crystalline POM polymer structure provides superior xylene resistance and dimensional stability at 65°C versus PP — preventing the hole enlargement and dimensional creep that can increase fragment loss risk in PP cassettes over repeated processing cycles. The 1.0 mm aperture remains consistent across the cassette service life, ensuring reliable fragment retention for the small specimens that require this format.

Is the gray pigmentation stable through xylene and paraffin?

Yes. The gray color is compounded into the Acetal (POM) matrix — not a surface coating — ensuring full color stability through formalin, ethanol, xylene, and paraffin wax without leaching or fading. Color permanence is critical for reliable specimen identification at the embedding station.