Universal Square Bottom Open Mouth Bag for Chemical Materials | Laminated Color Print Water & Moisture Proof | Full Compatibility for Powders/Granules/Flakes | Custom Factory Made

I. Product Overview 
This product is a versatile, square-bottom, flat-mouth chemical packaging bag that combines the stacking stability of a square bottom with the flexible filling capabilities of a flat mouth, making it suitable for a wide range of chemical materials in powder, granular, and flake forms. The color-printed laminated construction delivers full-color brand presentation while providing waterproof and moisture-proof protection, and supports full customization by manufacturers.

II. Applicable Materials 
Powders: titanium dioxide, calcium carbonate, talc, resin powder, pigments, dyes 
Granules: plastic pellets, synthetic resin pellets, fertilizer granules, rubber granules 
Thin sheets: plastic sheets, mica sheets, feed pellets 
III. Four Core Advantages 
1. Square bottom, flat mouth 
The square-bottom design ensures that the bag maintains a neat, rectangular shape after filling, preventing tilting during palletizing and allowing 2 to 3 additional layers to be stacked compared with conventional flat-bottom bags; the flat-top design facilitates smooth filling and is suitable for materials of various shapes.

2. Color printing with laminating for waterproof and moisture-proof protection 
Full-color intaglio printing ensures clear brand presentation; the surface is laminated with a PE film offering a water vapor barrier rate of ≥90%, ensuring material safety during rainy-weather transportation or in humid storage conditions.

3. Full Material Compatibility 
Powders, granules, and flakes can all be smoothly filled using the flat-mouth design, allowing a single bag type to be used across the entire plant and reducing inventory SKUs.

4. Manufacturer Customization 
Dimensions, printing, and functionality can all be customized to meet specific requirements.

IV. Material and Specifications 
Material Structure: PP Woven Fabric + Color-Printed Laminated Layer 
Bag style: square-bottom flat pocket (square, three-dimensional bottom; flat, open top) 
Bottom construction: heat-sealed bottom / stitched and reinforced bottom 
Tensile strength: ≥700 N/50 mm (30% above the national standard) 
Packaging capacity: 10 kg / 15 kg / 20 kg / 25 kg 
Bag dimensions: Customizable upon request (length × width × bottom width) 
V. Sealing and Filling 
Sealing methods: sewing with a bag-sewing machine / heat sealing / tying

Applicable filling equipment: screw fillers / gravity fillers / manual filling

VI. Scope of Customization 
Dimensions: Length, width, and base width can be customized as needed.

Printing: Full-color custom branding of the brand logo, product information, and warning labels.

Optional features: PE inner liner / aluminum foil barrier layer / antistatic treatment / UN hazardous packaging certification

Bottom construction: heat-sealed bottom / sewn bottom

VII. Quality Assurance 
Packaging drop test: 25 kg load dropped from a height of 1.2 meters, with no breakage or leakage on all six sides.

Environmental Compliance: Manufactured using virgin PP material, recyclable, and compliant with UN hazardous packaging export certification.

VIII. Applicable Subjects 
Chemical raw material producers, plastic pellet processing companies, pigment and dye manufacturers, additive suppliers, fine chemical enterprises, and traders of powder, granular, and flake materials.

IX. Price and MOQ
Negotiable

X. Q&A
Q: What is the difference between a square-bottom flat pouch and a regular flat pouch? 
A: Square-bottom flat bags feature a three-dimensional, square-shaped bottom that maintains a neat, boxy shape after filling, ensuring stable stacking; by contrast, conventional flat bags have a flatter bottom, making them prone to tilting during stacking.

Q: Will flaky materials clog the bag opening? 
A: No. This product features a flat, open design with no narrow valve openings, ensuring smooth filling of sheet-like materials.

Q: Does lamination affect print clarity? 
A: It has no impact. After printing, the laminating process uses a transparent PE film to protect the design while enhancing color vibrancy.

Q: What is the minimum order quantity? 
A: The standard minimum order quantity is 5,000 units; details are negotiable.

Q: Could you provide UN hazardous packaging certification? 
A: Yes, it is permissible. For the export of hazardous chemicals, UN-certified packaging may be used.