Crystal Clear Polypropylene Lip and Tape Bags - Superior Moisture Barrier Properties

Premium polypropylene bags engineered with excellent moisture barrier properties and crystal-clear optical clarity. The pressure-sensitive adhesive flap creates a resealable closure without heat sealing equipment, while the 100% virgin polypropylene film provides superior product protection and visibility. Manufactured to meet FDA and USDA specifications for direct food contact applications.

These bags deliver professional packaging performance across commercial bakeries, food service operations, retail merchandising, and print/graphics applications. The 1.5-1.6 mil polypropylene construction offers excellent stiffness and moisture resistance while maintaining exceptional transparency. Available in sizes from 4.125" x 5.75" through 12.25" x 12.25" with 1.5" adhesive lip and heat-sealed bottom construction.

Select your specification below. Technical questions? Contact our packaging specialists at 800-569-1266 (M-F 8:30-5 EST).

Technical Specifications and Performance Characteristics

Polypropylene Film Properties

Manufactured from 100% virgin polypropylene resin (BOPP - Biaxially Oriented Polypropylene) with superior optical and physical properties:

• Moisture vapor transmission rate: Excellent barrier to water vapor and humidity
• Optical clarity: Crystal-clear transparency (>90% light transmission)
• Tensile strength: 1.5-1.6 mil gauge provides adequate tear and puncture resistance
• Stiffness modulus: Superior rigidity compared to polyethylene films
• Temperature stability: Maintains properties across normal ambient temperatures

The biaxially oriented manufacturing process creates molecular alignment in both machine and transverse directions, resulting in balanced strength properties and enhanced clarity compared to cast or blown films.

Adhesive Flap Seal Construction

Pressure-sensitive adhesive system engineered for commercial packaging applications:

• Flap dimension: 1.5" ±0.125" adhesive lip
• Release liner: Silicone-coated protective strip for adhesive preservation
• Initial tack: Immediate bond strength upon application
• Peel strength: Secure closure while allowing clean reopening
• Repositionability: Multiple seal/unseal cycles without adhesive degradation
• Temperature range: Optimal performance 60-80°F ambient conditions

The adhesive formulation provides consistent performance across varying humidity conditions and does not transfer residue to packaged products upon removal.

Manufacturing Tolerances

• Dimensional tolerance: ±1/16" to ±1/8" on width and length measurements
• Thickness tolerance: ±10% on nominal mil thickness
• Seal integrity: Heat-sealed bottom edge with <1% defect rate
• Clarity variation: Minimal haze across production runs

Regulatory Compliance and Food Safety

FDA Compliance for Food Contact

Manufactured in compliance with FDA regulations for materials in contact with food:

• 21 CFR 177.1520: Olefin polymers - compliant polypropylene resin
• Direct food contact: Approved for direct contact with all food types
• No migration limits: Virgin resin ensures no harmful substance migration
• Extractables testing: Meets FDA extraction requirements

USDA Specifications

Meets USDA requirements for food packaging materials under paragraph 177.1520 of Title 21 CFR. Suitable for commercial food service operations, retail food packaging, and institutional food distribution.

Additional Compliance

• California Proposition 65: Complies with CA Prop 65 requirements
• CONEG heavy metal restrictions: Meets all applicable limits for cadmium, lead, mercury, and hexavalent chromium
• RoHS compliance: Restriction of Hazardous Substances directive compliance
• Consumer Product Safety: Suffocation warning labeling as required

Application Engineering Guidelines

Moisture Barrier Performance

Polypropylene provides excellent moisture barrier properties suitable for applications requiring humidity protection:

Effective moisture barrier applications:

• Short-term food packaging (24-72 hour shelf life)
• Protection from ambient humidity and handling moisture
• Dust and particulate contamination prevention
• Surface moisture protection during display and storage

Moisture barrier limitations:

• Not hermetically sealed - some gas/vapor exchange occurs through adhesive closure
• Extended shelf life applications (>72 hours) require heat-sealed barrier packaging
• High-moisture products may experience condensation with temperature fluctuation

For applications requiring maximum moisture barrier performance, heat-sealable BOPP bags with hermetic seals provide superior protection.

Food Service Applications - Shelf Life Considerations

Bakery operations: Suitable for same-day and next-day sales where rapid turnover eliminates extended barrier requirements. Individual cookies, brownies, biscotti packaged in morning for afternoon/evening sales maintain adequate freshness. Not recommended for 3+ day shelf life applications requiring oxygen barrier properties.

Food service grab-and-go: Prepared foods, sandwiches, and ready-to-eat items with <48 hour consumption windows. The moisture barrier protects from handling and ambient humidity while resealable closure allows customer examination before purchase.

Institutional food service: Sample portions, individually portioned items, promotional food samples for immediate distribution.

Print and Graphics Industry Applications

Archival-quality polypropylene (acid-free, no corrosive materials) suitable for:

• Photography: Photo print protection (4x6, 5x7, 8x10) - no chemical interaction with photo emulsions
• Fine art prints: Giclée prints, lithographs, digital art - prevents fingerprints and surface damage
• Document preservation: Certificates, legal documents, important papers - moisture protection without chemical degradation
• Commercial printing: Brochures, marketing materials, promotional items - professional presentation

The crystal-clear film (>90% light transmission) provides accurate color representation without haze or distortion.

Retail Merchandising Engineering

Point-of-sale packaging applications requiring high visual impact:

• Product visibility optimization: Crystal clarity showcases merchandise without optical interference
• Display stability: Film stiffness maintains package shape on retail fixtures
• Customer interaction: Resealable closure allows product examination without package destruction
• Shelf presentation: Professional appearance enhances perceived product value

Dimensional Engineering and Size Selection

Size Range Specifications

Available dimensions engineered for common commercial applications:

Small format (4-5" opening width):

• 4.125" x 9.5" - Standard greeting cards, 4x6 photos
• 4.375" x 5.75" - Small cookies (3" diameter), jewelry, small parts
• 4.75" x 6.5" - 5x7 photos, larger greeting cards

Medium format (5-7" opening width):

• 5.25" x 7.25" - Cookie pairs, small baked goods
• 5.5" x 8.125" - Document protection, certificates
• 6" x 9" - 8x10 photos, multiple cookies, apparel items
• 6.5" x 6.5" - Square applications, retail packaging

Large format (9-12" opening width):

• 9" x 12" - Large prints, multiple items, clothing
• 10" x 13" - Bulk portions, product bundles
• 12.25" x 12.25" - Maximum capacity applications

Sizing Calculation Methodology

Dimensions listed as Width (W) x Length (L) where W = opening dimension:

Product measurement protocol:

1. Measure product at maximum width and length dimensions
2. Add minimum 0.5" to width for insertion clearance
3. Add minimum 2.0" to length (product dimension + 1.5" flap + 0.5" clearance)
4. Select next standard size meeting or exceeding calculated dimensions

Example calculation: 5" x 7" photo print requires 5.5" x 9" minimum bag dimension (5" + 0.5" = 5.5" width; 7" + 2" = 9" length).

Variable Length Packaging Technique

Effective bag length can be reduced through insertion depth adjustment. A 12" length bag functions as 10" or 11" effective length by limiting product insertion depth and incorporating excess film into flap seal. This technique provides flexibility for products falling between standard size increments.

Performance Comparison Matrix

Lip & Tape vs. Heat-Seal BOPP Packaging

Lip & Tape vs. Reclosable Polyethylene Bags

Storage and Handling Specifications

Product Storage Requirements

• Temperature: Store at 60-80°F ambient temperature
• Humidity: 30-60% relative humidity recommended
• Light exposure: Avoid direct sunlight (UV can degrade adhesive over extended periods)
• Shelf life: 24 months from manufacture date under proper storage conditions
• Stacking: Cases can be stacked up to 6 high without crushing bag contents

Operational Guidelines

Sealing procedure:

1. Insert product to appropriate depth (minimum 0.5" below flap fold line)
2. Remove release liner in single smooth motion
3. Fold flap along natural crease line
4. Apply firm pressure across entire adhesive width (10-15 seconds)
5. Verify complete adhesive contact along seal line

Quality control checks:

• Inspect seal integrity visually - adhesive should contact uniformly
• Test seal by gentle pull - proper seal resists opening without tearing
• Check product positioning - items should not press against seal area

Packaging Quantity and Ordering

Standard packaging quantity: 1,000 bags per case for all sizes. Case dimensions and weights vary by bag size. Cases designed for efficient warehouse storage with stackable construction.

Volume ordering considerations: Contact for contract pricing on recurring volume orders. Minimum order quantity: 1 case per size.

Technical Support and Specifications Assistance

Our packaging engineering team provides technical support for application-specific questions:

• Material compatibility testing recommendations
• Dimensional sizing calculations for custom products
• Shelf life estimation for food applications
• Regulatory compliance documentation
• Alternative product recommendations for specialized requirements

Contact technical support: 800-569-1266 (M-F 8:30-5 EST)