5.5 Package Closure, Labeling & Chemical Indicator Placement

Package Closure, Labeling & Chemical Indicator Placement

Core Concept: Secure package closure, accurate lot control labeling, and correct chemical indicator placement provide essential quality assurance for sterile processing. These elements guarantee package integrity, enable total inventory recall traceability, and verify sterilant penetration.

Before any package enters a sterilizer, it must be properly secured with validated closure materials, labeled with precise load control data, and fitted with internal and external chemical indicators compliant with ANSI/AAMI/ISO 11140-1 standards.

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Approved Package Closure Methods

Package closure maintains microbial barrier integrity until the package is opened. Only validated closure mechanisms designed specifically for medical sterilization may be used.

Approved Closure Systems

• Chemical Indicator Tape: External pressure-sensitive tape engineered with chemical indicator lines for specific sterilants (e.g., steam tape featuring diagonal white stripes that change to dark brown/black; EO tape that changes to green).
• Tamper-Evident Locks: Breakout plastic latch seals applied to rigid container handles. They break upon opening, providing visual proof that container sterility has not been breached.
• Heat Seals & Self-Seals: Used on peel pouches. Heat seals must be continuous, smooth, and free of channels or bubbles.

STRICTLY PROHIBITED CLOSURE MECHANISMS

CRITICAL WARNING: NEVER use safety pins, paper clips, or staples to close sterilization packages! Metal fasteners punch permanent holes through wrapping material, destroying microbial barrier integrity. NEVER use standard masking tape, duct tape, office tape, or rubber bands—these materials melt, release toxic adhesive residues, or cut into SMS wraps.

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Package Labeling and Lot Control Information

Package labeling provides full traceability in the event of a sterilizer malfunction or positive Biological Indicator (BI) failure.

Placement Rules for Package Labeling

• Labels must be written or applied onto chemical indicator tape, external tracking stickers, or the plastic film side of paper-plastic peel pouches.
• STRICT RULE: NEVER write directly on the paper side of a peel pouch or directly on SMS non-woven wrap material! Solvents from pens and markers leach through paper fibers and synthetic layers, contaminating internal surgical instruments with toxic chemical residues.

Lot Control Sticker Requirements

Every package processed in a health care facility must bear a lot control label containing three mandatory data points:

1. Sterilizer Number: Identifies the specific autoclave or sterilizing unit used (e.g., Sterilizer #4).
2. Sterilization Date (Julian Date): The date of processing, commonly displayed as the Julian Date (the continuous day of the year from 001 to 365/366; e.g., July 22 is day 203).
3. Cycle / Load Number: The specific sequential run number for that sterilizer on that day (e.g., Load #03).

Recall Functionality

If a biological indicator test fails, the lot control sticker allows Central Service personnel to immediately identify, locate, and quarantine every item processed in that specific load across all hospital departments.

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Classification of Chemical Indicators (ANSI/AAMI/ISO 11140-1)

Chemical Indicators (CIs) use thermochromic chemical dyes that undergo a distinct visual color change when exposed to specific physical conditions. ISO 11140-1 categorizes CIs into six distinct types:

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Placement Guidelines for Internal and External CIs

Chemical indicators must be placed strategically to verify sterilant penetration both externally and internally.

External CIs (Type 1)

• Applied to the exterior of every package (unless internal CIs are clearly visible through transparent plastic film).
• Purpose: Serves as a visual signal to staff that the package has undergone processing, preventing unprocessed items from being stocked on sterile supply shelves.

Internal CIs (Type 4, 5, or 6)

• Placed inside every wrapped tray, rigid container, and peel pouch.
• Placement Location: Must be placed in the geometric center of wrapped sets or the area designated as most difficult for sterilant to reach.
• Multi-Level Trays: An internal chemical indicator MUST be placed on EVERY level of a multi-level instrument tray (positioned in opposing diagonal corners of upper and lower baskets).
• Peel Pouches: Placed inside the pouch facing out through the clear plastic side so surgical staff can verify color change before opening.