Executive Summary
Cashew classification is the process of separating raw cashew nuts and processed kernels according to size, shape, colour, moisture, defects, and commercial quality. It is one of the most important quality-control stages in modern cashew processing because different grades are sold to different buyers and used for different applications.
A large, clean whole kernel may be sold as a premium snack product, while splits and smaller pieces may be supplied to bakeries, confectionery companies, food manufacturers, or nut butter producers. Correct classification therefore helps processors improve product consistency, reduce disputes with buyers, and obtain better value from every batch.
For processors in South Africa and other African markets, understanding raw cashew nut classification, kernel count grades such as W180 and W320, and broken-kernel categories is essential when designing a profitable processing line.
What Does Cashew Classification Mean?
Cashew classification does not refer to a single inspection step. It normally takes place at two different stages:
- Before processing, when raw cashew nuts are assessed for size, moisture, defects, and expected kernel recovery.
- After processing, when peeled kernels are separated by size, shape, colour, and physical condition.
These two systems serve different purposes.
Raw nut classification helps processors estimate purchasing value and select suitable steaming and shelling settings. Kernel classification determines the final commercial grade that appears on export documents, packing lists, and buyer specifications.
Good classification begins before shelling and continues until the finished kernels are packed.
Why Cashew Classification Matters
Cashew buyers do not pay the same price for every kernel. Whole, large, evenly coloured kernels normally attract greater interest from premium snack and retail markets, while broken grades are usually sold for ingredient applications.
Accurate classification helps processors achieve:
- More consistent export lots
- Better price negotiation
- Lower buyer rejection risk
- Improved packaging accuracy
- More efficient use of broken kernels
- Better production planning
Classification also gives factory managers useful information about the performance of the processing line. A sudden increase in broken kernels, scorched kernels, or mixed sizes may indicate problems with steaming, shelling, drying, peeling, or machine adjustment.
Raw Cashew Nut Classification Before Processing
Before raw cashews enter the production line, processors commonly evaluate several physical and commercial factors.
Nut Count
Nut count measures how many raw cashew nuts are present in a given weight. A smaller number of nuts generally indicates larger individual nuts, although size alone does not guarantee good kernel recovery.
Nut count is useful for:
- Selecting grading screens
- Adjusting shelling equipment
- Planning batch capacity
- Separating small and large raw nuts
Uniform raw nut size improves shelling consistency because the machine does not have to handle very different shell dimensions in the same feed stream.
Moisture Content
Moisture affects storage stability, shelling behaviour, and kernel weight.
The FAO raw cashew quality guide notes that moisture must be controlled from harvest through shelling. Raw nuts that are too wet may develop mould, while excessively dry nuts may produce brittle kernels and greater processing losses.
Processors should therefore check moisture before:
- Long-term storage
- Steam cooking
- Shelling
- Purchasing large raw-nut lots
Outturn or Kernel Recovery
Outturn is an estimate of how much usable kernel can be recovered from a raw cashew nut sample.
A higher expected recovery normally increases the commercial value of a raw-nut lot. However, processors should also consider the proportion of whole kernels, broken kernels, defective kernels, and immature nuts.
Two raw-nut lots may have similar total recovery but produce very different final values if one generates substantially more premium whole kernels.
Defective Raw Nuts
Typical raw-nut defects include:
- Immature nuts
- Empty shells
- Insect-damaged nuts
- Mouldy nuts
- Poorly dried nuts
- Nuts contaminated with foreign material
Raw material inspection should take place before the nuts reach the shelling section. Stones, dust, and foreign material can also damage conveyors, cutting components, and grading screens.
Why Raw Nut Size Affects Shelling Results
A shelling machine performs best when the incoming raw nuts have relatively consistent dimensions.
If very small and very large nuts are fed together, one machine adjustment may not suit the entire batch. Excessive pressure can damage large kernels, while insufficient pressure may leave smaller shells unopened.
Processors can improve separation results by:
- Cleaning raw material
- Separating nuts into size groups
- Controlling steaming conditions
- Adjusting shelling pressure for each group
A properly configured cashew nut shelling machine helps apply more consistent cracking force after the raw nuts have been graded and conditioned.
Cashew Kernel Classification After Processing
After shelling, drying, and peeling, the kernels are classified according to their final commercial characteristics.
International specifications generally consider:
- Whether the kernel is whole or broken
- Kernel count per pound or kilogram
- Colour and appearance
- Scorching or blemishes
- Adhering testa
- Insect or mould damage
- Moisture level
- Foreign matter
The UNECE DDP-17 Standard for Cashew Kernels provides internationally recognised terminology for whole kernels, broken kernels, quality classes, tolerances, and commercial presentation.
What Does the “W” in Cashew Grades Mean?
In common commercial grading, W designates a whole cashew kernel. Some suppliers also use WW, meaning white whole.
The number following the letter relates to the approximate kernel count per pound. A lower number means fewer kernels are needed to make one pound, so the individual kernels are larger.
For example:
- W180 kernels are larger than W320 kernels.
- W320 kernels are larger than W450 kernels.
- The grade number describes size count, not automatically flavour or overall quality.
A W180 lot can still contain defects if processing and quality control are poor. Size, colour, moisture, and defect tolerances must all be assessed separately.
Common Whole Cashew Grades
The Association of Food Industries Specifications for Cashew Kernels lists standard whole-kernel size designations according to count per pound and kilogram.
| Grade | Approximate Count per Pound | Approximate Count per Kilogram | Typical Market Position |
|---|---|---|---|
| W180 | 140–180 | 266–395 | Very large premium kernels |
| W210 | 180–210 | 395–465 | Large whole kernels |
| W240 | 220–240 | 485–530 | Premium large kernels |
| W320 | 300–320 | 660–706 | Widely traded medium kernels |
| W450 | 400–450 | 880–990 | Smaller whole kernels |
These size bands help buyers compare lots and plan retail or industrial applications.
W180 Cashew Classification
W180 represents one of the largest common whole-kernel grades.
Its visual size makes it suitable for:
- Premium snack products
- Luxury gift packs
- Hotel and airline catering
- High-end retail presentation
However, factories should not assume that producing W180 automatically means the processing line is performing well. The final lot must still meet requirements for colour, moisture, defects, flavour, and contamination.
W210 and W240 Cashew Grades
W210 and W240 kernels offer a balance between premium size and commercial availability.
They are commonly suitable for:
- Branded snack products
- Retail pouches
- Roasted and flavoured cashews
- Export cartons
- Premium ingredient applications
These grades require careful mechanical handling because broken kernels lose their whole-grade classification even when the original kernel was large.
W320 Cashew Classification
W320 is one of the most recognised grades in international cashew trade.
Its medium size makes it suitable for a broad range of applications, including:
- Retail snack bags
- Roasted cashew products
- Food-service packs
- Mixed nut products
- Private-label packaging
W320 is often commercially attractive because it offers a practical balance between appearance, availability, and price.
W450 Cashew Classification
W450 kernels are smaller whole kernels.
They may be selected for:
- Value-focused retail ranges
- Smaller snack packs
- Food-service operations
- Mixed nut products
- Ingredient supply
Although smaller than W320, properly processed W450 kernels can still deliver excellent colour, flavour, and food safety performance.
What Is Considered a Whole Cashew Kernel?
Under established commercial specifications, a kernel may still be classified as whole when it retains its characteristic cashew shape and no more than approximately one-eighth has broken away.
This definition is important because a tiny damaged tip does not necessarily move the kernel into a broken grade.
Processors should train inspection workers to apply the same standard consistently. Without clear rules, one shift may classify a kernel as whole while another shift records it as broken, creating inaccurate production data.
Classification of Broken Cashew Kernels
Not every broken kernel is waste. Broken grades have their own markets and commercial uses.
Butts
Butts are kernels broken across their width. A significant portion of the original kernel remains, and the cotyledons are naturally attached.
They are often used in:
- Bakery products
- Confectionery
- Nut mixes
- Food-service applications
Splits
Splits are kernels divided lengthwise into two natural halves.
Splits are suitable for:
- Decorative bakery toppings
- Cooking ingredients
- Roasted snack mixtures
- Confectionery products
Large Pieces
Large pieces are commonly used where the appearance of a full kernel is unnecessary but visible cashew texture is still desirable.
Applications include:
- Biscuits
- Chocolate products
- Granola
- Ice cream
- Prepared foods
Small Pieces, Chips, and Baby Bits
Smaller broken grades can be used for:
- Cashew butter
- Nut pastes
- Sauces
- Bakery fillings
- Cereal products
- Processed food ingredients
A well-managed processor creates separate sales channels for each grade instead of treating broken kernels as a single low-value product.
Cashew Classification by Colour and Appearance
Size is only one part of cashew classification.
The AFI specification separates kernels into quality groups including:
- First Quality Fancy
- Second Quality Scorched
- Third Quality Special Scorched
- Lightly Blemished grades
- Dessert or blemished grades
First Quality Fancy
These kernels generally have a uniform appearance that may be white, pale ivory, or light yellow.
They are commonly associated with premium export and retail applications.
Scorched Kernels
Scorched kernels may show light brown, yellow, ash-grey, or deeper ivory colour caused by processing heat.
Scorching may occur during:
- Steam treatment
- Drying
- Shelling
- Peeling preparation
- Roasting
A scorched kernel may remain edible, but it belongs to a different commercial quality class.
Special Scorched and Blemished Kernels
These grades may contain deeper colour changes, spots, shrivelling, or visible blemishes.
They are often directed to markets where appearance is less important than flavour, texture, or ingredient performance.
How Processing Creates Classification Defects
Many final defects are not caused in the orchard. They are created or worsened during cashew kernel processing.
| Processing Problem | Possible Classification Result |
|---|---|
| Excessive shelling pressure | More butts, splits, and pieces |
| Uneven drying | Mixed colour and moisture |
| Excessive heat | Scorched kernels |
| Poor peeling | Adhering testa |
| Rough conveying | Chipped or broken kernels |
| Inadequate inspection | Defective kernels in premium lots |
| Mixed raw-nut sizes | Uneven shelling and roasting results |
Classification data should therefore be used as a production-control tool, not only as a packing label.
Mechanical Grading by Kernel Size
After peeling, kernels can be separated mechanically according to their dimensions.
A professional cashew nut grading machine helps processors divide kernels into more uniform size groups before manual inspection and packing.
Mechanical grading offers several benefits:
- Faster throughput
- More consistent size separation
- Reduced manual labour
- Better preparation for colour sorting
- More accurate packaging by grade
The machine should be adjusted carefully because aggressive vibration, excessive drop height, or unsuitable screen openings can increase breakage.
Manual Inspection After Mechanical Grading
Mechanical equipment cannot identify every defect.
Human inspectors may still be required to remove:
- Insect-damaged kernels
- Adhering shell material
- Dark spots
- Misshapen kernels
- Foreign matter
- Incorrectly graded pieces
A cashew kernel sorting conveyor provides controlled product flow, inspection lighting, and working positions for manual quality control.
The conveyor speed should allow workers enough time to inspect the kernels without creating unnecessary production delays.
Optical Colour Sorting
Colour sorting provides a second level of quality control after mechanical size grading and manual inspection.
A cashew colour sorting machine uses cameras, lighting, software, and pneumatic rejection to identify kernels with colour differences or visible defects.
Depending on the configuration, it may help remove:
- Dark kernels
- Scorched kernels
- Black-spotted kernels
- Foreign material
- Severely discoloured pieces
Colour sorting does not replace correct processing. If the entire batch has been overheated, the machine cannot convert it into a premium white grade. It can only separate kernels according to the quality already produced.
Moisture Requirements for Finished Cashew Kernels
Finished kernel moisture influences shelf life, texture, packaging stability, and resistance to blocking.
The AFI specification states that cashew kernel moisture should generally be 3%–5%.
If moisture is too high:
- Kernels may block together
- Mould risk can increase
- Shelf life may be reduced
- Packaging stability may suffer
If kernels are excessively dry:
- They may become brittle
- Breakage may increase
- Product weight may be lost
Moisture should therefore be measured before final grading and packaging.
Packaging Cashews by Grade
Once classification is complete, each grade should be packed and labelled separately.
Packaging records should identify:
- Product name
- Grade
- Net and gross weight
- Country of origin
- Lot or production code
- Packing date
- Allergen information
- Buyer-specific marks
An automatic cashew nut packing machine helps processors maintain consistent bag weights and reduce the risk of mixing grades during final packing.
Industry Case: Why Mixed Grades Affect Sales Value
Classification has a direct commercial impact.
In its Q1 2026 cashew production update, Dekel Agri-Vision reported lower average cashew selling prices during a period in which sales contained a relatively higher proportion of lower-priced mixed grades.
This industry example shows why processors should monitor not only total production volume but also the grade composition of the finished output.
A factory may produce more tonnes while earning less per tonne if the proportion of premium whole grades declines.
Common Cashew Classification Mistakes
Treating Size as the Only Quality Factor
A large kernel is not automatically premium quality. Colour, moisture, defects, flavour, and contamination must also be checked.
Mixing Whole and Broken Grades
Even small amounts of broken material can reduce the consistency of a whole-kernel lot.
Grading Before Moisture Stabilises
Kernels may change weight and handling behaviour if they are graded before cooling and moisture stabilisation.
Using Inconsistent Inspection Standards
Operators must use the same definitions for whole kernels, splits, butts, blemishes, and defects.
Ignoring Buyer Specifications
UNECE and AFI standards provide useful frameworks, but the final purchase contract may contain additional buyer requirements.
How to Improve Cashew Classification Accuracy
Processors can improve classification results by following a clear workflow:
- Inspect and sample the raw cashews.
- Separate raw nuts by size before steaming and shelling.
- Monitor moisture at key production stages.
- Adjust shelling equipment for each raw-nut size group.
- Dry and cool kernels uniformly.
- Remove testa without damaging the kernel surface.
- Mechanically grade kernels by size.
- Conduct manual defect inspection.
- Use optical colour sorting where appropriate.
- Pack and label each grade separately.
- Keep production and traceability records for every lot.
Selecting Equipment for Cashew Classification
The correct equipment depends on plant capacity, target market, labour availability, and buyer requirements.
| Processing Need | Recommended Equipment |
|---|---|
| Uniform shell opening | Size preparation and shelling machine |
| Kernel size separation | Cashew kernel grading machine |
| Manual quality control | Sorting conveyor |
| Colour and defect removal | Optical colour sorter |
| Separate grade packaging | Automatic packing machine |
The entire line should be balanced. A high-capacity grader offers little benefit if the inspection conveyor or packing section cannot handle the same volume.
Final Takeaway
Cashew classification determines how raw nuts are purchased, how kernels are processed, and how finished products are sold.
Raw cashew nut classification focuses on nut count, moisture, defects, and expected recovery. Finished-kernel classification considers size count, whole or broken form, colour, scorching, blemishes, moisture, and other quality factors.
Grades such as W180, W210, W240, W320, and W450 describe whole-kernel size, while butts, splits, large pieces, and smaller pieces serve different food-manufacturing markets.
For South African and African processors, accurate classification can improve buyer confidence, reduce disputes, support better pricing, and reveal where production losses occur. The strongest results come from combining suitable machinery with consistent sampling, trained inspection staff, and clear buyer specifications.
Quick Summary Table
| Topic | Key Information |
|---|---|
| Primary Keyword | Cashew classification |
| Raw Nut Factors | Nut count, moisture, defects, recovery |
| Whole Grades | W180, W210, W240, W320, W450 |
| Broken Grades | Butts, splits, large pieces, small pieces |
| Quality Factors | Colour, scorching, blemishes, testa, moisture |
| Finished Moisture | Commonly 3%–5% under AFI specifications |
| Main Equipment | Grader, sorting conveyor, colour sorter, packing machine |
| Commercial Benefit | Better consistency, pricing, and buyer acceptance |
| Main Risk | Mixing grades or using inconsistent inspection standards |
| Best Practice | Grade, inspect, sort, pack, and record each lot separately |