What is the ICUMSA Measurement System?

The ICUMSA (International Commission for Uniform Methods of Sugar Analysis) color scale is the global standard for measuring sugar purity. Established in 1897, ICUMSA developed standardized analytical methods that allow sugar quality to be objectively compared across producers and countries. The color measurement uses spectrophotometry at 420 nanometers wavelength to detect dissolved impurities and color-forming compounds in sugar solutions. A lower ICUMSA number indicates fewer impurities and a whiter, more refined product.

The ICUMSA scale ranges from 45 IU (the most refined commercial grade) up to 4,600 IU or higher for unprocessed raw sugar directly from the mill. Each grade serves specific market needs: ICUMSA 45 for direct consumption and premium food manufacturing, ICUMSA 100-150 for industrial food processing, ICUMSA 600-1200 for raw sugar trading and re-refining, and higher ICUMSA values for molasses-rich specialty products. As an ICUMSA 45 sugar supplier, MC INTERNATIONAL provides detailed ICUMSA test certificates with every shipment to confirm exact color values.

The Multi-Stage Refining Process

Producing ICUMSA 45 sugar requires sophisticated refining technology. The process begins with raw cane sugar (ICUMSA 600-1200) undergoing affination – a washing step that removes surface molasses from raw crystals. The washed sugar is then dissolved into a thick syrup and subjected to clarification through carbonatation (using milk of lime and carbon dioxide) or phosphatation to precipitate impurities. The clarified liquor passes through activated carbon columns or ion-exchange resins that remove color compounds, amino acids, and remaining organic impurities. Finally, the purified syrup undergoes vacuum crystallization at precisely controlled temperatures, centrifugal separation, and hot-air drying to produce the sparkling white crystals that define ICUMSA 45 grade.

Why 99.80% Polarity Matters

Polarity, measured as the optical rotation of a sugar solution, indicates the actual sucrose content of the sugar. At 99.80% minimum polarity, ICUMSA 45 sugar contains virtually nothing but pure sucrose – the remaining 0.20% consists of trace amounts of moisture, minerals, and invert sugars. This extreme purity is critical for pharmaceutical applications where excipient quality must meet pharmacopeial standards, for carbonated beverage manufacturing where impurities can affect taste and shelf life, and for high-end confectionery where crystal clarity directly impacts product appearance. MC INTERNATIONAL, as a white sugar supplier, guarantees every ICUMSA 45 shipment meets or exceeds the 99.80% polarity threshold.

Thailand: The World’s #2 Sugar Exporter

Thailand has established itself as the world’s second-largest sugar exporter after Brazil, with annual production exceeding 10 million metric tons from over 1.8 million hectares of sugarcane cultivation. The Thai sugar industry operates more than 50 sugar mills concentrated in central and northeastern provinces including Nakhon Ratchasima, Udon Thani, Khon Kaen, and Kanchanaburi. Thailand’s tropical climate provides ideal growing conditions with abundant rainfall during the planting season and dry weather during the November-to-April harvesting period.

The country’s modern refineries, including facilities operated by Mitr Phol, Thai Roong Ruang, and Khon Kaen Sugar, are capable of producing ICUMSA 45 sugar that meets the strictest international standards. As an ICUMSA 45 sugar supplier based in Thailand, MC INTERNATIONAL leverages these world-class production capabilities to offer competitive pricing, consistent quality, and year-round availability. The Thai government’s supportive regulatory framework, including the Cane and Sugar Act, ensures stable pricing and quality standards that benefit both producers and international buyers.