Specimen Containers, Black — 240-A420-000 | 100/Bag | Caplugs® Evergreen

Temperature Indicator Strips with Adhesive Backing — Liquid Crystal, 100/Bag | Caplugs® Evergreen

Technical Narrative

The Caplugs® Evergreen 240-A420-000 is a pressure-sensitive adhesive liquid crystal temperature indicator strip — a passive, battery-free temperature monitoring solution for cold chain verification, vaccine storage documentation, biological specimen transport monitoring, and laboratory reagent temperature compliance. Liquid crystal technology displays temperature via a color-change response in the cholesteric liquid crystal layer: the black strip body transitions to a green band at the calibrated temperature range, providing an immediate visual read-out of current surface temperature without instruments, power, or data loggers. The adhesive backing enables direct application to specimen containers, vaccine carriers, reagent kits, shipping boxes, and cold room equipment for continuous passive monitoring from point of departure through point of delivery.

Unlike electronic data loggers that require calibration cycles, battery replacement, and software download infrastructure, adhesive liquid crystal strips provide documentation-grade temperature evidence at a fraction of the per-unit cost — making them the preferred monitoring solution for high-volume cold chain programs where a data logger per shipment is economically impractical. The strips support AABB and CAP accreditation temperature documentation requirements for blood bank component transport, WHO and CDC vaccine cold chain guidelines for vaccine storage verification, FSMA temperature monitoring requirements for food safety programs, and GxP cold chain documentation requirements for pharmaceutical biological products.

At $38.90 per 100/Bag — $0.3890 per strip — the delivers passive temperature monitoring at a per-unit cost that enables strip-per-shipment programs at scale. The 100/Bag bulk format supports high-volume cold chain operations managing 50–500+ monitored shipments per week without per-unit electronic monitoring overhead.

Technical Specifications — Caplugs® Evergreen

Cold Chain & Laboratory Application Compatibility —

The adhesive liquid crystal temperature indicator strips provide passive, battery-free temperature exposure evidence across the following cold chain and laboratory monitoring applications:

Confirm the temperature range specification on the strip label before deployment. Liquid crystal strips are sensitive to adhesive surface temperature — apply to the container surface directly, not over labels or secondary packaging layers that insulate the strip from the specimen.

Usage & Environmental Compatibility

Liquid crystal temperature indicator strips are passive devices — no power, no calibration, no data download required. The following conditions affect strip performance and must be considered during deployment:

Clinical & Research Laboratory Applications

The temperature indicator strips serve hospital blood bank and transfusion medicine departments for blood component transport documentation; public health and immunization programs for vaccine cold chain verification; clinical reference laboratories for biological specimen transport temperature documentation; pharmaceutical companies for biologics and temperature-sensitive drug cold chain compliance; biotech and cell therapy programs for PBMC and cellular product transport monitoring; food safety and distribution programs for perishable temperature verification; and any cold chain program requiring passive, battery-free, single-use temperature documentation at scale.

U.S. Manufacturing, Quality & Institutional Procurement

Every Caplugs® Evergreen lot is manufactured at our California facility and subject to rigorous quality inspection and material verification. We supply reference laboratories, hospital systems, biotech firms, and federal procurement offices under institutional pricing programs with blanket-order support and same-day shipping on stocked inventory. Request a sample below to validate before committing to volume.

Frequently Asked Questions — Caplugs® Evergreen

How do liquid crystal temperature indicator strips work?

Liquid crystal temperature indicators use cholesteric (chiral nematic) liquid crystal technology — a phase state that reflects specific wavelengths of visible light at specific temperatures. As the strip reaches its calibrated temperature range, the liquid crystal layer transitions from black (below range) to a visible green band (at or above range), providing an immediate visual read-out of current surface temperature. The response is reversible — the strip returns to black when temperature drops below range — allowing continuous monitoring across repeated temperature cycles. No batteries, calibration, or data download equipment required.

Are these strips suitable for vaccine cold chain monitoring per WHO guidelines?

Adhesive liquid crystal temperature indicator strips provide visual temperature evidence suitable for cold chain documentation in vaccine storage and transport programs. For WHO PIS (Performance, Integrity, and Safety) Grade A/B indicator requirements for vaccine cold chain programs, confirm the specific temperature threshold and accuracy specification on the product label against your program's WHO indicator grade requirements. Request a sample to validate before procurement for regulatory cold chain programs.

What is the difference between liquid crystal strips and electronic data loggers?

Electronic data loggers provide time-stamped temperature records with downloadable data — the gold standard for GxP pharmaceutical cold chain and audit trail requirements. Liquid crystal strips provide a current visual temperature read-out — ideal for high-volume, low-cost cold chain monitoring where per-shipment logger economics are prohibitive. Most cold chain programs use both: electronic loggers for high-value GxP shipments requiring complete audit trails, and liquid crystal strips for routine specimen transport and vaccine monitoring where visual documentation meets accreditation requirements.