"Grade" is one of the most misunderstood words in the nori trade. Buyers often ask for "A grade" expecting a fixed, universal specification. In practice, grading is a commercial shorthand: each supplier defines its own bands, and two sheets sold under the same letter by different factories can behave quite differently on a rolling mat.

What follows is how professional buyers actually evaluate roasted sushi nori, and how to match a sheet to the application you are buying for.

What a nori grade actually describes

A nori grade is a bundle of measurable and semi-measurable properties, not a single number. The ones that matter in day-to-day purchasing:

  • Color. Deep green-black is the target for premium sheets. Greenish or brownish tones usually indicate different drying or toasting conditions, and they read as lower quality on a display shelf.
  • Luster. A clean surface sheen signals a well-toasted, intact sheet. Dull, powdery surfaces often mean handling damage or excess moisture.
  • Holes and tears. Pinholes are normal in a natural product. What separates grades is how many, how large, and whether they cluster. A sheet with several large holes will fail in front of a customer.
  • Thickness and basis weight. Thicker sheets are more forgiving to roll but can feel heavy in the mouth. Thin sheets are elegant but tear more easily.
  • Uniformity. Consistent sheet size, square edges and even thickness matter more than most buyers expect, because they determine how evenly a roll wraps and how predictable yield is per pack.
  • Moisture. Too much moisture makes sheets limp and prone to sticking; too little makes them brittle. Moisture is also the single biggest driver of shelf-life problems after opening.

The A / B / C shorthand

Most traders use a three-band shorthand. It is useful, but it is not a formal standard, and the boundaries move from supplier to supplier.

A grade — dense, even deep-green color, strong luster, very few pinholes, uniform thickness and clean edges. This is the sheet you put in front of a diner: high-end maki where the wrap is visible, and gunkan or nigiri where the nori band is part of the presentation.

B grade — good color and structure with occasional small holes or slight thickness variation. Perfectly serviceable for everyday maki, supermarket packs and most catering work, where the sheet is mostly hidden or quickly eaten.

C grade — visible color variation and more frequent holes. This grade belongs in shredded nori, blends, toppings and volume catering where the sheet is not seen whole. Buying A grade for shredding is money spent on a property nobody will notice.

The practical rule: never approve a grade from a letter alone. Ask for a physical sample from the production lot, and evaluate it against the application.

Matching the grade to the application

Maki rolls (hosomaki and futomaki). The sheet has to hold fillings without splitting and has to wrap evenly. Even thickness matters more than absolute grade here: a sheet that varies from thick to thin produces an uneven roll and inconsistent cut faces.

Nigiri and gunkan. The nori is visible, so color, luster and the absence of large holes dominate. Buyers in this segment usually accept B grade for volume menus and reserve A grade for premium lines.

Onigiri. The sheet wraps rice and is handled by the consumer, so flexibility and moisture retention matter most. A slightly thicker sheet that survives handling is often a better choice than a thinner premium sheet that cracks at the fold.

Shredded nori, blends and toppings. Color consistency across the batch still matters for appearance, but whole-sheet integrity does not. C grade is the economical choice.

Institutional and catering volumes. Consistency between cartons is worth more than a marginal upgrade within a carton. A stable B grade that behaves the same every month is easier to plan around than an inconsistent A grade.

What to check before you approve a sample

A short checklist that settles most sourcing arguments before they start:

  • Sheet dimensions, sheet count per pack and net weight — and whether they match the label.
  • Moisture behaviour: how the sheet feels ten minutes after the pack is opened.
  • Hole tolerance: how many pinholes per sheet your application can actually accept.
  • Toast level and aroma: light, medium or dark, and whether it is consistent across the lot.
  • Packing: inner barrier bag, carton configuration and pallet pattern for export.
  • Declared shelf life, and the storage conditions it assumes.

Storage and handling after delivery

Roasted nori is hygroscopic — it takes on moisture from the air. Keep packs sealed until use, store away from light and heat, and keep the storage area dry. Once a pack is opened, the clock starts: use it within the period stated on the label, and reseal what you do not use immediately. Most quality complaints in this category trace back to storage, not to the sheet itself.

How Weidongjia supplies

We produce roasted sushi nori in 50-sheet / 140g and 100-sheet / 280g packs across several grades, and we support OEM / ODM private-label programmes for importers, distributors and food-service brands. Our facility in Lianyungang, Jiangsu Province has passed an annual HACCP and ISO 22000:2018 food-safety audit.

You can review the full range on our products page, or contact our team for grade samples, packing options and a wholesale quotation. When you enquire, tell us the application and the market — that is usually enough for us to recommend the right grade instead of the most expensive one.