Slide-Fix™ PAP Jar Screw Caps — HDPE, Yellow, 1000/Bag (300-3531-Y20)
These yellow high-density polyethylene screw caps are purpose-built for Slide-Fix™ PAP smear fixative jars, providing a secure, leak-free closure with consistent thread engagement across every jar in the Slide-Fix™ product family. Part number 300-3531-Y20 supplies 1000 caps per bag and is supplied non-sterile, making it an efficient stock item for high-volume cytology and anatomic pathology laboratories. The yellow color enables rapid visual identification for color-coded batch routing protocols, and the HDPE material delivers proven chemical compatibility with both alcohol-based and Carbowax/PEG cytology fixatives.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3531-Y20 |
| Sub-brand | Slide-Fix™ (Caplugs® Evergreen) |
| Cap Style | Screw cap — PAP jar thread |
| Material | High-Density Polyethylene (HDPE) |
| Color | Yellow |
| Jar Compatibility | Slide-Fix™ PAP smear fixative jars |
| Fixative Compatibility | Alcohol (EtOH, IPA) and Carbowax/PEG fixatives |
| Autoclave Compatible | Yes — 121°C / 15 psi |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA (California) |
Applications
- Slide-Fix™ PAP jar capping — HDPE threads engage Slide-Fix™ jar neck geometry for leak-free fixative containment
- GYN cytology fixation — cervical, endocervical, and vaginal smear specimens requiring alcohol or Carbowax/PEG fixatives
- Non-GYN cytology — BAL, sputum, and body fluid smear fixation with color-based routing to separate specimen types
- Color-coded batch management — yellow caps expand cytology batch routing vocabulary beyond standard seven-color schemes in high-volume anatomic pathology labs
- Replacement cap program — exact thread match for Slide-Fix™ jar necks to replace lost or damaged caps without jar replacement
- CAP/CLIA cytology QC compliance — standardized HDPE closure supports pre-analytical protocol documentation
Compatibility
These caps are designed exclusively for Slide-Fix™ PAP smear fixative jars, sharing the identical HDPE material specification and thread geometry as all other colors in the nine-color Slide-Fix™ cap range. Because color is the only variable across the full Slide-Fix™ lineup, laboratories already using other Slide-Fix™ cap colors can add yellow to their inventory with no process changes. As always, validate cap-to-jar thread fit with a sample quantity before committing to a bulk purchase, particularly if integrating into an existing multi-color batch routing protocol.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Alcohol fixatives (EtOH, IPA) | Excellent — primary cytology fixative |
| Carbowax / PEG fixatives | Good — standard Slide-Fix™ formulation |
| Aqueous buffers / saline | Excellent |
| Dilute acids and bases | Good |
| Autoclaving (121°C / 15 psi) | Compatible — for pre-sterilized supply |
| Chlorinated solvents (e.g., chloroform) | Not recommended |
Quality & Procurement
Made in USA, Caplugs® Evergreen Slide-Fix™ caps are manufactured from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer stocking 300-3531-Y20 in USA inventory, enabling same-business-day fulfillment for routine replenishment and emergency orders. Tiered pricing is available for institutional procurement, hospital systems, and grant-funded research programs requiring regular high-volume cytology consumable supply.
Frequently Asked Questions
Will these caps fit any PAP jar, or only Slide-Fix™ jars?
These caps are engineered specifically for the Slide-Fix™ PAP smear fixative jar neck thread. Compatibility with third-party PAP jars has not been established, so we recommend validating fit with a sample order before bulk purchase if you intend to use them on non-Slide-Fix™ jars.
Can these caps be autoclaved for pre-sterilized use?
Yes — the HDPE material is compatible with standard autoclave cycles at 121°C / 15 psi, making them suitable for laboratories that require pre-sterilized closure supplies.
What does the yellow color designation indicate in a cytology lab?
Yellow is used in color-coded cytology batch routing to designate specialized fixative batches, culture-associated cytology specimens, or day-of-week coded accession batches. Together with the other eight colors in the Slide-Fix™ range, yellow provides the full color vocabulary needed for complex batch routing protocols in high-volume cytology and anatomic pathology workflows.
Are all nine Slide-Fix™ cap colors made from the same material and thread geometry?
Yes — all nine Slide-Fix™ colors share identical HDPE material specification and PAP jar thread geometry. Color is the only variable, so switching colors or stocking multiple colors requires no changes to your jar inventory or capping workflow.