Description
Discount! Buy 4 or more lots of 1000 bags and get 5 % off - Automatically applies at checkout
| Specification | Details |
|---|---|
| Bag Size | Small |
| Substrate Capacity Per Bag | Approximately 2 to 4 lbs. (0.91 to 1.82 kg) |
| Material | Polypropylene, 3.0 mil |
| Type | Gusseted |
| Dimensions | 4" x 3" x 18" (10.1 × 7.6 × 45.7 cm) |
| Filter Type | T |
| Filter Size | 1.5" x 1.5" (2.54 cm × 2.54 cm) |
| Filter Pore Size | 0.2 microns |
| Filter Hole Style | L |
| Price per Bag |
Unicorn 4T Filter Patch Bags
These bags are identical in construction to the Type 4A model, with the key difference being the inclusion of a Type T filter. They are commonly used for fruiting block production, providing excellent contamination control and reliable airflow.
Featuring side gussets and a high-quality breathable filter, these bags stand upright once filled and provide excellent structural stability with a reinforced bottom seal. Manufactured by Unicorn using proprietary additives, the bags remain flexible at all temperatures, including after sterilization. The wide opening allows for easy sealing, while the durable bottom seal is built to withstand agitation during handling and processing.
Filter Type Descriptions
Type B Filter
The Type B filter offers high gas exchange performance. With 90% pore coverage and larger pore sizes (5 microns) than the Type A filter, it allows bags to be sealed prior to autoclaving. In most other bags, filters either permit competing fungi to enter or contain pores that are too small and may rupture during sterilization.
Type T Filter
The Type T filter features 0.2-micron pores and 90% filtration efficiency. It is specifically designed for spawn production, providing strong contamination control while maintaining adequate airflow.
Type A Filter
The Type A filter is designed for shiitake cultivation. It has a nominal pore size of 0.5 microns, offering approximately 80% efficiency at this level. With 50% of the surface area dedicated to filtration, it provides enhanced breathability, allowing shiitake mycelium to thrive in higher CO₂ environments.
This bag is identical to bag Type 4-A except that it has a Type T filter. It is often used in the production of grain spawn.
Side-gusseted and breathable, they create a sturdy stand-up bag after filling and have a strong bottom seal. Manufactured by Unicorn with proprietary additives, Unicorn Bags are pliable at any temperature as well as after sterilization. The bag opening is designed for easy sealing and the bag’s bottom seal can withstand agitation.
Description of Filter Types
Type B filter has high gas exchange characteristics. With 90% pore coverage, the pore sizes are larger than the A filter, at 5 microns. Due to these characteristics, B-filtered bags can be sealed before autoclaving. For most other bags, either the filters allow competing fungi to enter, or too-small pores will pop during autoclaving.
Type T filter has 0.2-micron pores. They are 90% efficient and are designed for spawn production.
Type A filter is designed for shiitake cultivation. It has a nominal 0.5-micron pore size, meaning 80% efficiency at approximately 0.5 microns. This filter was also designed to have a surface area of 50% for breathability. This allows shiitake mycelium to grow in a higher CO2 environment.