Almost every sugar inquiry we get starts with a number — 45, 100, 150, 600. Buyers usually know they need “ICUMSA something” before they fully understand what the number actually measures. So before we get another email asking whether ICUMSA 45 is “better” than ICUMSA 150, let’s settle it properly. This is a full walkthrough of the ICUMSA scale sugar grading system, what the numbers mean, and how to pick the right one for whatever you’re making.
What ICUMSA Actually Stands For
ICUMSA is the International Commission for Uniform Methods of Sugar Analysis, the body that sets standardized testing methods used across the global sugar trade. When people talk about the ICUMSA scale sugar is graded on, they’re referring specifically to the color measurement method — how much light a sugar solution absorbs at a defined wavelength, expressed in ICUMSA units (IU). It’s not a subjective “how white does this look” judgment call; it’s a repeatable lab measurement that any accredited lab anywhere in the world can reproduce on the same sample and get a consistent number.
How the Scale Works, in Plain Terms
Lower numbers mean whiter, more refined sugar. Higher numbers mean more color is still present, which usually means less refining has taken place and more of the original cane’s natural character — molasses, minerals, pigments — remains in the crystal. Here’s roughly how the ICUMSA scale sugar grades break down across the products we supply:
| ICUMSA Range | General Category | Typical Use |
|---|---|---|
| 35 IU max | Ultra-refined white (Coca-Cola grade) | Carbonated drinks, clear syrups, pharma |
| 45 IU max | Premium refined white | General food and beverage manufacturing |
| 100 IU max | Refined white | Bulk food production, general retail |
| 150 IU max | Standard refined white | Bakery, confectionery, table sugar |
| 600–1200 | Raw brown / Grade E | Baking, brewing, specialty flavor applications |
It’s worth noting the scale technically extends beyond 1200 for very raw, minimally processed sugars, but for commercial food and beverage buyers, the range above covers the overwhelming majority of what actually gets traded.
Why the Number Isn’t the Whole Story
Color is only one axis of sugar quality, even though it’s the one buyers fixate on because it’s right there in the name. A full spec sheet also covers polarization (sucrose purity, typically 99.8% minimum for refined grades), moisture content, ash content, granulation, magnetic particle limits, and sulphur dioxide residue. Two sugars with an identical ICUMSA scale sugar reading can still differ in these other parameters, and for some applications — pharmaceutical use, sensitive fermentation processes — those secondary specs matter just as much as the color number everyone leads with.
How to Pick the Right Grade for Your Product
Clear liquids where any tint is visible — carbonated drinks, flavored water, clear syrups — need the lowest color readings available, typically ICUMSA 35 or 45.
Solid or opaque food products — baked goods, confectionery, most dairy applications — rarely need ultra-low color readings, since the sugar’s own tint disappears once it’s mixed into a batter, dough, or opaque liquid. ICUMSA 100 or 150 usually performs identically at a lower cost.
Products where molasses flavor is part of the recipe — craft brewing, specialty baking, caramel confections — actually want a higher ICUMSA reading, in the 600-1200 range, because that’s where the natural flavor and color characteristics buyers are seeking actually live.
Getting this wrong in either direction costs money: over-specifying purity means paying a premium for clarity your product doesn’t need, and under-specifying it in an application that needs it risks a finished product with visible color drift or an off flavor that shows up after the batch is already made.
A Common Misconception Worth Correcting
Buyers sometimes assume a lower ICUMSA number automatically means “healthier” or “more natural.” It’s the opposite, in fact — a lower number means more processing has taken place to strip out everything except pure sucrose. A higher number, like the 600-1200 range on raw brown sugar, actually indicates less processing and more retained natural character. Neither end of the ICUMSA scale sugar spectrum is objectively “better” — they’re simply suited to different applications, and confusing purity with nutrition is one of the more common mix-ups we clear up with new buyers.
How ICUMSA Testing Actually Happens
A sample of sugar is dissolved to a defined concentration, filtered to remove any undissolved particles, and passed through a spectrophotometer at a specified wavelength. The instrument measures how much light the solution absorbs, and that absorbance value converts to the IU reading used in trade documentation. It’s a standardized, repeatable lab process rather than a visual inspection, which is exactly why the scale works as a reliable basis for international trade — a buyer in Rotterdam and a mill in São Paulo are working from the same measurement method and can trust a lab report without needing to physically compare samples side by side.
How Refining Moves Sugar Down the Scale
Every step in the refining process removes a bit more color, which is why the this grading system grades track so closely with how many processing stages a batch has been through. Raw cane juice is milled, clarified, evaporated, and crystallized to produce raw sugar, which sits well up the color scale in the hundreds or thousands of IU. From there, refining removes the molasses coating and remaining pigments through affination, carbonatation or phosphatation, filtration, and decolorization — typically using activated carbon or ion-exchange resin.
Each additional decolorization pass pulls the reading down further: stopping around 150 IU gives you standard refined white sugar, continuing further gets you to the 100 or 45 IU range, and an extra dedicated pass beyond that gets you to the 35 IU Coca-Cola grade. It’s a matter of degree, not a different raw material — which is exactly why the price differences between adjacent grades are noticeable but not dramatic, while the difference between raw brown sugar and any refined white grade is much larger, reflecting the much bigger processing gap.
Common Misunderstandings We Clear Up With New Buyers
“I need the lowest ICUMSA number available for the best quality.” Not necessarily — quality is about matching the grade to the application, not chasing the lowest number on principle. Buying ICUMSA 35 for a baked good that will never show color drift is simply an unnecessary premium.
“All ICUMSA 45 sugar is identical regardless of supplier.” The grade defines a maximum color reading and a set of associated specs, but suppliers can and do vary in consistency, documentation, and how tightly they control the other parameters like moisture and ash content. The number on the spec sheet is a starting point for due diligence, not a substitute for it.
“Raw sugar and brown sugar are the same thing.” Not exactly — raw sugar in the strict trade sense is minimally processed cane sugar at a very high color reading, while commercial brown sugar products like our Grade E ICUMSA 600-1200 are partially refined with a controlled, documented specification rather than being fully unprocessed.
“A higher price always means a lower ICUMSA number.” Mostly true but not absolute — crop conditions, origin, and market demand for specialty raw sugars can sometimes push pricing on higher-IU products up independently of the general relationship between refining level and cost.
How This Plays Out in Real Sourcing Decisions
We regularly get inquiries from buyers who specify a grade based on what a competitor uses, without necessarily confirming it’s the right fit for their own product. It’s worth actually testing your finished product with two adjacent grades side by side before locking in a long-term supply contract — the visual and flavor difference between, say, ICUMSA 45 and ICUMSA 150 in a baked good is often smaller than buyers expect, and confirming that with your own trial run before committing to volume pricing can meaningfully change your sourcing budget.
On the other end of the scale, buyers making a genuinely clear beverage who try to save money with a higher-IU sugar sometimes discover the color drift shows up faster than anticipated, particularly after a few months of shelf storage rather than immediately at bottling.
Where Our Grades Sit on the Scale
Global Sugar Supplies ships across the full practical range of the ICUMSA scale sugar spectrum:
- ICUMSA 35 sugar — the tightest purity grade, for beverage and pharma applications.
- ICUMSA 45 sugar — the standard premium refined grade for general food manufacturing.
- ICUMSA 100 sugar — a widely available refined white sugar for bulk production.
- ICUMSA 150 sugar — cost-effective refined white sugar for bakery and confectionery.
- Crystal white sugar — our general-purpose refined white grade.
- Raw brown cane sugar Grade E (ICUMSA 600-1200) — for molasses-forward applications.
Every one of these grades is tested and documented to the same rigorous standard, so whichever number your product needs, the quality assurance process behind it doesn’t change.
Why the Scale Matters for International Trade Specifically
Domestically, a food manufacturer might get away with a looser, less formal sugar specification because they can inspect a sample in person or build a relationship with a local mill over years. International bulk buying doesn’t offer that luxury — you’re often ordering a container or a vessel’s worth of product from a supplier on another continent based entirely on paper documentation and trust in the testing process. The ICUMSA scale sugar standard exists precisely to make that kind of long-distance transaction reliable.
A buyer in Germany and a mill in Thailand can agree on a number, both trust that number means the same thing under standardized testing, and structure a contract around it without ever needing to meet in person or physically inspect the product before it ships. That’s not a small thing in a commodity trade worth billions of dollars annually — it’s the entire foundation that makes bulk international sugar sourcing function at all.
This is also why documentation matters as much as it does in every guide we publish on this site. An ICUMSA number without an accompanying, dated, verifiable lab report is just a claim. With one, it’s a testable, tradeable specification that customs authorities, quality inspectors, and your own receiving team can all check against the same standard.
Beyond Color: The Full Picture Buyers Should Check
We’ve said this in nearly every grade-specific guide on this site, but it bears repeating here since this is the page that ties them all together: color is one line on a specification sheet, not the whole document. Polarization tells you sucrose purity. Moisture tells you how the sugar will behave in storage and transit. Ash content affects flavor neutrality, particularly in clear liquid applications.
Granulation affects dissolving speed and packing behavior. Magnetic particle and sulphur dioxide limits are food safety parameters that matter regardless of which color grade you’re buying. A buyer who only asks “what’s the ICUMSA number” and stops there is checking one box out of several that actually determine whether a shipment performs well in their specific process.
How to Read a Sugar Lab Report
When a supplier sends you an SGS or in-house lab report for an this scale shipment, here’s what to actually check rather than skimming past it. The ICUMSA colour reading should be at or below the maximum for your specified grade — not just close to it. Polarization should meet or exceed the 99.8% minimum typical of refined grades. Moisture and ash content should sit at or below spec, since both affect shelf life and flavor neutrality.
Check the test date against your shipment date — a report from months earlier on a different production run tells you little about the actual container being loaded now. And confirm the report references a batch or lot number that matches your shipment’s documentation, not a generic reference sample the supplier uses across multiple deals. A legitimate supplier will have no problem walking you through this; hesitation or vague answers on these specifics is a reasonable reason to ask more questions before wiring payment.
Seasonal and Market Factors That Affect Availability
Sugar isn’t a static commodity sitting in unlimited supply at every point on the ICUMSA scale sugar range year-round. Cane harvest cycles differ by origin — Brazil, Thailand, and India each have their own harvest windows — and supply of specific grades can tighten around harvest transitions or in years with weaker crop yields. Refineries also allocate their decolorization capacity based on demand, meaning a surge in orders for ultra-refined grades like ICUMSA 35 can occasionally create longer lead times even when raw sugar itself is in ample supply. Ordering ahead of your peak production season, rather than reactively when you’re already low on stock, gives you more flexibility on both pricing and delivery timing across any grade on the scale.
Polarization: The Purity Number That Sits Next to Colour on ICUMSA Scale Sugar Specs
Colour gets all the attention on an ICUMSA scale sugar spec, but buyers who know the trade always look at polarization next. Polarization, often shortened to “pol,” measures how much of the sugar is sucrose. It’s read with a polarimeter, an instrument that measures how much a sugar solution rotates polarized light, and it’s reported in degrees on the International Sugar Scale (°Z). The technique itself is well established; polarimetry has been used in sugar labs for well over a century.
On any ICUMSA scale sugar certificate, the higher the pol, the purer the sugar. Our refined grades, from ICUMSA 35 to ICUMSA 150, are all sold at 99.80° minimum. VHP raw sugar sits around 99.2° to 99.3°, and raw brown sugar runs lower, at 96° to 98°. That gap matters most to refineries, because pol drives how much white sugar they can recover from each tonne of raws, and raw sugar contracts are usually priced with premiums or discounts for pol.
Colour and Purity Don’t Always Move Together
New buyers of ICUMSA scale sugar often assume a whiter sugar is always a purer one. Usually it is, but the two numbers measure different things. Colour on the ICUMSA scale sugar system tracks light-absorbing compounds left after processing. Polarization tracks sucrose content. A sugar can be very pure and still carry slightly more colour if it was stored badly, kept too long, or exposed to heat, because sugar can darken slowly over time.
That’s why a good ICUMSA scale sugar specification lists both, and why we’d never judge a lot on colour alone. If you’re comparing ICUMSA scale sugar offers, check that colour, pol, moisture and ash all appear on the certificate, and that they were measured on samples drawn from your actual shipment.
Moisture, Ash and Crystal Size: The Supporting Cast
- Moisture. Refined white sugar should be very dry. Our refined grades are held to 0.04% maximum. Too much moisture leads to caking, lumps and, in the worst cases, microbial growth during long voyages.
- Ash. Measured by conductivity, ash shows how much mineral matter remains. It affects taste and clarity in drinks.
- Granulation. Fine crystals dissolve faster. Coarser crystals flow better through some dosing systems. Bakeries and beverage plants often want different sizes, so state your preference.
- Sulphur dioxide. A residue from some processing routes. Limits vary by grade and by the import rules in your market.
A Quick ICUMSA Scale Sugar Grade Comparison
| Grade | Colour (ICUMSA) | Polarization | Typical buyers |
|---|---|---|---|
| ICUMSA 35 | 35 max | 99.80° min | Soft drinks, clear beverages |
| ICUMSA 45 | 45 max | 99.80° min | Food and drink manufacturing, retail packing |
| ICUMSA 100 | 100 max | 99.80° min | Bakeries, confectionery, distributors |
| ICUMSA 150 | 150 max | 99.80° min | Industrial food use, cost-sensitive markets |
| ICUMSA 600 to 1200 | 600 to 1200 | 96° to 98° | Refineries, some food uses |
Each ICUMSA scale sugar grade has its own detailed guide too: see ICUMSA 35 sugar, white refined sugar ICUMSA 45, ICUMSA 100 sugar, ICUMSA 150 sugar and raw brown sugar ICUMSA 600-1200.
Mistakes Buyers Make With ICUMSA Scale Sugar Specs
The most common mistake is paying for a whiter ICUMSA scale sugar grade than the product needs. The second is ignoring everything except colour. The third is accepting a specification that was clearly copied from somewhere else, with numbers that don’t match the grade being offered. If an ICUMSA 45 offer lists a pol of 97°, for example, something is wrong. Read the whole ICUMSA scale sugar sheet, ask questions, and insist on independent testing at loading. Our bulk refined sugar guide explains how refined grades are produced, which makes these numbers easier to sanity-check.
Frequently Asked Questions
Is a lower ICUMSA number always more expensive? Generally yes, since it requires additional refining steps, though market conditions and origin can shift this at any given time.
Can ICUMSA color readings vary within the same grade? Slightly, yes — that’s why grades are specified as a maximum (like “45 IU max”) rather than an exact fixed number, and why requesting a current lab report on an actual shipment is always worth doing.
Does a higher ICUMSA number mean lower quality? No — it means a different processing stage and a different set of characteristics, not a defect. Raw brown sugar at 600-1200 IU is a correctly specified, high-quality product for the applications it’s designed for.
Who sets and maintains the ICUMSA standard? ICUMSA itself, an international body focused on standardizing sugar analysis methods used across the global trade, referenced alongside broader food safety frameworks like Codex Alimentarius in most national regulatory frameworks.
Not Sure Which Grade You Need? Ask Us
Understanding the ICUMSA scale sugar grading system is the first step — matching it correctly to your product is the part that actually saves money and avoids formulation headaches down the line. Browse our full product range across every grade we carry, or contact our sales team directly and describe what you’re making. We’ll tell you honestly which grade fits, even when that means recommending a cheaper option than the one you asked about.
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