If you are buying refined white sugar in bulk — whether for food manufacturing, distribution or direct sale — you will encounter the term "ICUMSA 45" in almost every seller's specification sheet. But what does the number actually mean? Why does it matter? And how do you verify that what you receive actually meets the standard?
This guide answers all of those questions in plain terms, without requiring a background in food science.
What Is ICUMSA?
ICUMSA stands for the International Commission for Uniform Methods of Sugar Analysis. It is an intergovernmental body founded in 1897 that sets standardised analytical methods for the global sugar industry. The "ICUMSA number" on a sugar specification sheet refers to a colour measurement — specifically, the reflectance of a sugar solution under specific lighting conditions, expressed in Reflectance Brightness Units (RBU).
The lower the ICUMSA number, the whiter and more refined the sugar. A score of 45 RBU or below is considered bright sparkling white, suitable for direct human consumption and the most demanding food industry specifications.
The ICUMSA Colour Scale
| ICUMSA Rating | Colour Description | Typical Application |
|---|---|---|
| ≤ 45 RBU (ICUMSA 45) | Sparkling white | Table sugar, beverages, confectionery, dairy, pharmaceutical |
| 46–100 RBU | White | Baking, food manufacturing |
| 101–150 RBU | Off-white | Industrial food processing |
| 600–1,200 RBU | Light brown | Further refining |
| 1,200–2,200+ RBU (VHP) | Dark golden/brown (raw) | Refinery feedstock |
Full ICUMSA 45 Specification Breakdown
Colour is just one parameter. A complete ICUMSA 45 specification covers several analytical measurements that together define whether a sugar is suitable for its intended purpose.
Polarisation (Purity)
Polarisation measures the sucrose content as a percentage of total dissolved solids. It is expressed in degrees (°Z) on the polarimetric scale. For ICUMSA 45, the minimum is 99.8°Z, meaning the sugar is at least 99.8% pure sucrose. This is close to the theoretical maximum purity achievable in commercial refining.
Moisture Content
Moisture content is critical for preventing clumping, microbial growth and quality degradation during storage and transit. ICUMSA 45 sugar must have a moisture content of ≤ 0.04%. This extremely low figure is what makes it free-flowing and resistant to caking under normal storage conditions.
Conductivity Ash
Conductivity ash measures the mineral content (non-sugar impurities) in the sugar. A lower ash content means a purer, better-refined product. The standard for ICUMSA 45 is ≤ 0.04%. High ash content can affect flavour and indicate poor refining.
Reducing Sugars (Invert Content)
Reducing sugars — primarily glucose and fructose produced when sucrose partially inverts during processing — affect flavour, colour stability and shelf life. The specification limit for ICUMSA 45 is ≤ 0.04%. Elevated reducing sugars can cause browning (Maillard reactions) in food products.
Grain Size
For standard ICUMSA 45, the typical grain size is 0.4–0.6 mm — a fine crystal that dissolves quickly and measures accurately in industrial processes. Coarser grain (0.8–1.2 mm) is available in some markets as "coarse crystal" but is less common in bulk commodity trade.
Sulphur Dioxide (SO₂)
Sulphur dioxide may be used as a bleaching agent in the refining process. Residual SO₂ in sugar is regulated in most importing countries. The standard maximum for ICUMSA 45 is ≤ 20 ppm. EU buyers should note that EU regulations cap SO₂ in food at 10 mg/kg for most applications, so checking the actual test result (not just the specification limit) is advisable.
Complete ICUMSA 45 Specification Table
| Parameter | ICUMSA 45 Standard |
|---|---|
| ICUMSA colour | ≤ 45 RBU |
| Polarisation | ≥ 99.8°Z |
| Moisture content | ≤ 0.04% |
| Conductivity ash | ≤ 0.04% |
| Reducing sugars (as invert) | ≤ 0.04% |
| Sulphur dioxide (SO₂) | ≤ 20 ppm |
| Sediment | Absent |
| Turbidity | Low (clear solution) |
| Grain size (typical) | 0.4–0.6 mm |
How to Verify Sugar Quality Before You Buy
Specification sheets from a seller are only as reliable as the seller. For large orders, independent verification is standard practice in the commodity trade. Here is the process buyers use:
1. Request a Certificate of Analysis (COA)
Ask the seller to provide a third-party COA for the specific lot you are buying. This should come from an accredited laboratory, not the seller's in-house lab. The COA should cover all the parameters listed above.
2. Arrange Pre-Shipment Inspection
Companies like SGS, Bureau Veritas, Intertek and Cotecna offer pre-shipment inspection services at the loading port. The inspector draws a sample from the cargo, tests it and issues a report confirming that the goods meet contracted specifications before they are loaded. For shipments over $50,000, the cost of inspection ($200–$600) is trivial relative to the risk it mitigates.
3. Request a Quotation Sample
Before signing a contract, request a courier sample (typically 1–2 kg). You can have this tested at a local accredited food lab to verify that the seller's specification is genuine. Look specifically at moisture, polarisation and SO₂.
4. Check Packing Integrity
ICUMSA 45 sugar is typically packed in new 50 kg polypropylene woven bags with inner PE liner, or 1 MT FIBC jumbo bags. Check that bags are heat-sealed, not just tied, and that the inner PE liner is intact — moisture ingress from a torn liner can degrade the entire bag.
Commercial Applications for ICUMSA 45 Sugar
The ≤ 45 RBU colour rating makes this grade suitable for applications where pure white colour and clean flavour are required:
- Beverages: Carbonated drinks, juices, energy drinks, flavoured water — the neutral colour prevents any caramel hue in clear liquids
- Confectionery: Hard candies, gummies, chocolate coatings, fondants — consistent colour critical for product appearance
- Dairy: Yoghurt, flavoured milk, ice cream, condensed milk
- Retail table sugar: Consumer packaging for supermarkets and wholesale distributors
- Pharmaceutical syrups: Liquid medications and supplements where a clean, neutral sweetener base is required
ICUMSA 45 vs VHP Raw Sugar: Key Differences
| Feature | ICUMSA 45 (Refined) | VHP Raw Sugar |
|---|---|---|
| ICUMSA colour | ≤ 45 RBU | 1,200–2,200 RBU |
| Appearance | Sparkling white, fine crystal | Dark golden/brown, coarse |
| Polarisation | ≥ 99.8°Z | ≥ 99.4°Z |
| Ready for consumption? | Yes — directly | No — requires further refining |
| Price | Higher (refined) | Lower (needs refining cost) |
| Buyer | Food manufacturers, distributors, retail | Sugar refineries |
Frequently Asked Questions
Is ICUMSA 45 sugar suitable for direct human consumption?
Yes. ICUMSA 45 meets the Codex Alimentarius standard for refined white sugar and is suitable for direct consumption without further processing. It is the same grade sold in consumer retail packaging worldwide.
Why does the specification say "≤ 45 RBU" rather than exactly 45?
The specification sets a maximum. A score of 20 or 30 RBU is still ICUMSA 45 — it just means the sugar is even whiter than the minimum required. Buyers should not reject sugar that scores below 45; it exceeds specification.
How long does ICUMSA 45 sugar stay fresh?
Properly packaged and stored in cool, dry conditions (below 25°C, away from moisture and strong odours), ICUMSA 45 sugar has a shelf life of approximately 2 years. Moisture is the primary risk — once a bag is compromised, quality degrades quickly.
Can you supply ICUMSA 100 or ICUMSA 150 sugar?
We specialise in ICUMSA 45. Other grades may be available on enquiry subject to supply. Contact us with your specification and we will confirm what is currently available.
Need ICUMSA 45 sugar for your business?
Request a quote for refined white sugar from Golden Seed Export. Tell us quantity, packing preference and discharge port — we respond within two business days.
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