Slide-Fix™ PAP Jar Screw Caps — HDPE, Purple, 1000/Bag (300-3531-U20)
These purple High-Density Polyethylene (HDPE) screw caps are purpose-built for Slide-Fix™ PAP smear fixative jars, supplied non-sterile in 1000/Bag quantities for high-volume cytology and anatomic pathology laboratories. Part number 300-3531-U20 joins eight other Slide-Fix™ cap colors — all sharing identical HDPE material and thread geometry — giving cytology labs a nine-color vocabulary for complete batch routing protocols. The HDPE construction provides reliable chemical resistance to alcohol-based and Carbowax/PEG cytology fixatives and withstands autoclave sterilization at 121°C.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3531-U20 |
| Sub-brand | Slide-Fix™ (Caplugs® Evergreen) |
| Cap Style | Screw Cap — PAP jar thread |
| Material | High-Density Polyethylene (HDPE) |
| Color | Purple |
| 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
- Leak-free closure of Slide-Fix™ PAP smear fixative jars in cytology and anatomic pathology labs
- GYN cytology fixation — cervical, endocervical, and vaginal smear specimens with alcohol or Carbowax/PEG fixatives
- Non-GYN cytology — BAL, sputum, and body fluid smear fixation with color-coded specimen separation
- Color-coded batch routing in high-volume cytology labs where common cap colors are already assigned to other specimen categories; purple designates specialized sub-types, overflow accession batches, or specific anatomic site designations
- Replacement cap program for lost or damaged Slide-Fix™ jar closures, using the exact OEM thread geometry
- Pre-analytical cytology protocol compliance in CAP/CLIA-accredited laboratories
Compatibility
These caps are designed exclusively for Slide-Fix™ PAP smear fixative jars. All nine colors in the Slide-Fix™ cap range — including the purple 300-3531-U20 — share identical HDPE material and screw-thread geometry, so purple caps can be introduced into an existing Slide-Fix™ jar inventory without any change to jar stock. Laboratories that have already allocated orange, fuchsia, red, green, and other colors to established routing categories can use purple to expand their protocol to a full nine-color batch routing scheme. Validate cap-to-jar thread fit with a sample quantity before committing to a bulk purchase if your jar lot differs from standard Slide-Fix™ supply.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Alcohol fixatives (EtOH, IPA) | Excellent — primary cytology fixative service |
| Carbowax / PEG fixatives | Excellent |
| Aqueous buffers / saline | Excellent |
| Dilute acids and bases | Good |
| Autoclave — 121°C / 15 psi | Compatible |
| Aromatic / chlorinated solvents | Not recommended for prolonged contact |
Quality & Procurement
Made in USA (California), Caplugs® Evergreen Slide-Fix™ caps are manufactured from BPA-free, phthalate-free HDPE resin. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory, typically same business day for stocking items. Tiered pricing is available for high-volume cytology labs, hospital systems, and institutions purchasing on grant or departmental accounts.
Frequently Asked Questions
Will these purple caps fit any PAP jar, or only Slide-Fix™ jars?
The thread geometry on these caps is matched to Slide-Fix™ PAP smear fixative jars. Compatibility with other manufacturers' PAP jars is not guaranteed — validate fit with a sample before bulk purchasing if you use non-Slide-Fix™ jars.
Are these caps autoclavable for pre-sterilized supply?
Yes. The HDPE material is autoclave-compatible at 121°C / 15 psi, allowing labs to sterilize caps prior to use when pre-analytical protocol requires it.
Why add a purple cap color when other Slide-Fix™ colors are already available?
High-volume cytology and anatomic pathology labs often exhaust a six- or seven-color routing scheme as their specimen categories grow. Purple — along with yellow — extends the Slide-Fix™ color range to nine, providing enough distinct colors to designate specialized cytology sub-types, overflow accession batches, or separate anatomic site categories without reusing a color already in service.
Do all nine Slide-Fix™ cap colors share the same material and thread?
Yes. Color is the only variable across the entire nine-color Slide-Fix™ screw cap range. All colors use the same HDPE resin and identical PAP jar thread geometry, so switching colors or stocking multiple colors requires no changes to jar inventory or capping equipment.