What types of biological liquid bags are there

Biological fluid bags (also known as bio-storage bags or liquid sampling bags) are critical consumables in bioprocessing, pharmaceuticals, and laboratory settings, designed for liquid storage, transportation, and sampling. They are characterized by sterility, chemical resistance, and strong biocompatibility. Below is a comprehensive overview of their classifications and features:

I. Main Types and Applications

Laboratory Sampling Bags

• Capacity: Typically 60 mL to 1000 mL, used for collecting water, food, and environmental samples. For example, sterile water sampling bags feature a sulfur-containing rounded bottom for freestanding design, ideal for liquid sampling.
• Features: Pressure-sealed strips, writable label areas, freestanding design; some include sulfur to minimize sample contamination.

Bioprocess/Pharmaceutical Storage Bags

• Capacity: Ranging from 500 mL to 300 L, used for storing and transporting culture media, raw solutions, and sterile preparations. 2D storage bags utilize medical-grade multilayer co-extruded films, supporting temperatures from -80°C to 60°C, and undergo over 30 physical and biological performance tests.
• Customization: Compatible with tubing, filters, and other components, such as 50 mL–500 L 2D/3D bags.

Freeze-Thaw Bags

• Designed for ultra-low temperature applications, such as freeze-thaw processes. These bags employ blown co-extrusion technology to enhance membrane freeze resistance, preventing weld seam cracking at -80°C.

II. Core Performance Features

• Material Safety: Most products use USP Class VI-certified medical-grade films, free of animal-derived ingredients, and pass tests for bacterial endotoxins and biocompatibility.
• Physical Strength: Resistant to crushing and abrasion (e.g., withstanding 2-ton vehicle compression tests) and capable of holding ultra-capacity water without rupture.
• Sterilization Method: Gamma irradiation sterilized (SAL 10⁻⁶), ensuring the absence of DNase/RNase and pyrogens.