When importers evaluate a macadamia NIS offer, attention usually goes straight to size grade and price per tonne. But the number that most reliably separates a good container from an expensive problem is kernel moisture. Here's what it means and how to use it.
What the numbers mean
Moisture in macadamias is quoted two ways, and confusing them causes real commercial disputes. Kernel moisture is the water content of the kernel itself — the figure that determines storage stability. Whole-nut (in-shell) moisture runs higher because the shell holds water too. A serious spec sheet states which basis it uses; ours are quoted as kernel moisture.
The export benchmark is ≤2% kernel moisture. At that level the kernel is shelf-stable for many months, crack-out is clean, and the nut travels without deteriorating. Between 2% and 4% the lot is usable but the clock is ticking; above that, mould and rancidity risk climb quickly — a real concern on a 25–35 day sailing to Asian ports.
Why under-dried lots reach the market
Drying to a true, uniform 2% takes time, energy and control — which costs money. An aggregator buying from many smallholders often cannot verify how each parcel was dried, and blending hides the wet pockets. This is one of the strongest arguments for buying single-origin from a grower-exporter who controls the whole chain: one orchard, one curing plant, one verifiable drying record. It's the model we run at Umkondo Estate, with every batch passing through Advanced AI Curing before grading.
How to verify a supplier's claim
- Ask for the basis: kernel or whole-nut? If the seller can't answer immediately, walk away.
- Test the sample: a calibrated moisture meter or simple oven-dry test on the sample lot tells you more than any certificate.
- Check the spec sheet: moisture should be stated per grade alongside size, kernel recovery and defect tolerances — see our guide to reading NIS specifications.
- Put it in the contract: agree the moisture spec, the test method and the remedy up front.
Our Extra Dry Export NIS is built for buyers who treat moisture as the first-order variable it is. Request a sample and current drying records through a trade enquiry.