SUNPACK 50-Cell Heavy-Duty Insert - Thermoformed PP - Fits Standard 1020 Trays

Reusable 50-Cell Insert Built From Flexible Polypropylene for Bigger Transplants

The SUNPACK 50-Cell Heavy-Duty Insert is thermoformed from polypropylene rather than the polystyrene used in many disposable inserts, giving it the flex and impact resistance to survive repeated seasons of cleaning, stacking, and bench use instead of cracking after one cycle. Fifty larger cells, instead of the more common 72, give each plug extra root volume for crops that need more room before transplant.

Polypropylene's added flexibility means the insert can bend slightly under load without snapping, which matters most at transplant time when cell walls are squeezed to release rootballs. That same durability is what lets a nursery keep reusing the same set of inserts year after year instead of replacing them every season.

Key Features & Benefits

• 50 larger-volume cells — Gives each plug more root and media space than a standard 72-cell insert, suited to bigger transplant-stage seedlings and rooted cuttings.
• Thermoformed polypropylene construction — More flexible and impact-resistant than polystyrene, resisting cracks from repeated flexing and stacking.
• Multi-year design life — Built to be cleaned and reused across several growing seasons rather than discarded after one.
• Standard 1020 footprint — Drops into any standard 10in x 20in propagation tray without modification.
• Smooth cell walls — Let rooted plugs slide free cleanly at transplant time, reducing root disturbance.

Who Should Use This

Commercial greenhouse growers and nursery operations that want an insert built to survive years of reuse, rather than a single-season disposable, are the target for this 50-cell format. It particularly suits crops that need more cell volume than a standard 72-cell insert provides, such as larger vegetable transplants or perennial starts.

Compatibility & Cell Sizing

This insert fits any standard 1020 (10in x 20in) propagation tray and works with peat, coco coir, bark, and other soilless media under overhead, bottom-watering, or flood-and-drain irrigation. Its 50-cell layout trades cell count for cell size compared with a 72-cell insert, so confirm which cell count better matches your crop before ordering in volume.

Frequently Asked Questions

How long does this insert typically last?

The thermoformed polypropylene construction is built to hold up across multiple growing seasons with normal handling and cleaning between cycles. Actual service life depends on how carefully inserts are cleaned, stacked, and stored between uses.

What is the difference between this 50-cell insert and a 72-cell insert?

The 50-cell format gives each individual cell more root volume at the cost of fewer total cells per tray. Choose the 50-cell insert for larger transplant-stage plugs or rooted cuttings, and a 72-cell insert for smaller seedlings started at higher density.

Why does polypropylene matter compared to polystyrene?

Polypropylene flexes rather than cracking when a cell is squeezed to release a rootball, which is the point of failure that ends a polystyrene insert's life early. That added flexibility is the main reason this insert is rated for repeated reuse.

What trays does this insert fit?

The insert is sized for any standard 10in x 20in (1020) propagation tray, including SUNPACK trays and most other brands' standard nursery flats. Confirm your tray's interior dimensions if you are using a non-standard or off-brand tray.

Can I use this insert with flood-and-drain irrigation?

Yes. The insert is compatible with overhead watering, bottom watering, and flood-and-drain systems. Its cell design allows water to reach the media without pooling against the plug.