Sugar Quality Certificates: How to Read SGS Reports, COA & Lab Results

Sugar quality certificates are the documentary proof that the sugar you're purchasing meets the contracted specifications. In bulk sugar trade, these documents — Certificates of Analysis, SGS inspection reports, and Certificates of Origin — serve as both quality verification and legal evidence in the event of disputes. A buyer who can't read these documents properly is a buyer at risk: overpaying for sugar that doesn't meet spec, accepting shipments that will fail customs inspection, or discovering quality issues only after payment has been released and the cargo is in transit.

This guide explains how to read sugar quality certificates, what each parameter means, how to spot red flags, and when to reject a shipment based on documentation alone.

What Are Sugar Quality Certificates?

Sugar quality certificates are official documents issued by accredited laboratories and independent inspection agencies that verify the specifications of a sugar shipment. The three core documents are: (1) a Certificate of Analysis (COA) confirming laboratory test results for color, polarization, moisture, ash, and reducing sugars; (2) an SGS (or Bureau Veritas/Intertek) inspection report confirming quantity, condition, and quality at the load port; and (3) a Certificate of Origin identifying the producing country for customs and tariff classification. Together, these documents provide objective, third-party verification that the sugar meets contracted specifications.

For context on what these certificates are testing and why each parameter matters, see our ICUMSA ratings guide.

The Three Core Documents Every Buyer Needs

Certificate of Analysis (COA)

The Certificate of Analysis is a laboratory report issued by an accredited testing facility — typically the laboratory of SGS, Bureau Veritas, or Intertek. It confirms the results of chemical and physical testing performed on a representative sample of the sugar shipment.

The COA reports:

• ICUMSA color rating (measured by spectrophotometry at 420nm)

• Polarization (sucrose content measured by polarimeter)

• Moisture content (loss on drying test)

• Ash content (residue after combustion)

• Reducing sugars (glucose and fructose levels)

The COA is the definitive quality verification document. If the sugar tests at ICUMSA 50 but your contract specified ICUMSA 45 maximum, the COA proves the cargo is off-spec — regardless of what the supplier claims.

SGS Inspection Report

The SGS inspection report (or equivalent from Bureau Veritas/Intertek) is issued by an independent inspection agency and covers both quality and quantity. An SGS inspector is present at the load port during loading, witnesses the sampling process, oversees the weighing, and inspects the cargo condition.

The SGS report confirms:

• Quantity loaded (weight in metric tonnes)

• Quality parameters (typically referencing the attached COA)

• Packaging and condition (bag integrity, cleanliness, moisture damage)

• Container or vessel details (bill of lading reference)

The SGS report serves dual purposes: quality assurance (confirming the COA is legitimate and the sample was properly taken) and quantity verification (protecting against short-shipment fraud). For a detailed breakdown of what SGS inspection covers and why it's required in professional sugar procurement, see SGS inspection for sugar.

Certificate of Origin

The Certificate of Origin identifies the country where the sugar was produced. This document is required by customs authorities for tariff classification and may be required by your Letter of Credit.

The Certificate of Origin is typically issued by:

• The chamber of commerce in the exporting country

• The sugar mill or exporter (for certain trade agreements)

• A government authority (for preferential trade agreements like GSP)

The origin matters because import duties vary by country of origin. Brazilian sugar entering the EU faces different tariffs than Thai sugar entering the EU. Some countries have preferential trade agreements that reduce or eliminate tariffs if proper origin documentation is provided.

[IMAGE: Annotated example Certificate of Analysis showing key sections — sample ID, test results, laboratory accreditation, authorized signatures]

How to Read a Certificate of Analysis (COA)

A properly formatted COA contains several standardized sections. Here's what to look for and verify.

Sample Identification Section

The top of the COA identifies the sample and links it to the shipment:

• Sample reference number — unique identifier assigned by the laboratory

• Date of sampling — when the sample was taken (should be within days of loading, not weeks)

• Location of sampling — typically the load port or mill

• Shipment reference — contract number, vessel name, or Bill of Lading reference

• Supplier/exporter name — confirms who submitted the sample for testing

Verify that the sample reference matches your contract or purchase order. If the COA references a different shipment or exporter, it's not your cargo.

Test Results Section — What Each Parameter Means

This is the core of the COA. Each quality parameter is listed with the test result and (sometimes) the test method used.

ICUMSA Color:

• Reported as "ICUMSA: 45 IU" or "Color: 45 IU"

• Test method should reference ICUMSA GS2/3-10

• Verify the result is ≤ the maximum specified in your contract (e.g., if contract says ≤ 45 IU, a result of 48 IU is off-spec)

Polarization (Pol%):

• Reported as "Polarization: 99.82%" or "Pol: 99.82°Z"

• Test method should reference ICUMSA GS2/1/3-1

• Verify the result is ≥ the minimum specified in your contract (e.g., if contract says ≥ 99.8%, a result of 99.75% is off-spec)

Moisture:

• Reported as "Moisture: 0.03%"

• Test method is typically loss on drying at 105°C

• Verify the result is ≤ the maximum specified (e.g., ICUMSA 45 typically specifies ≤ 0.04%)

Ash Content:

• Reported as "Ash: 0.03%"

• Test method is incineration at 550–600°C

• Verify the result is ≤ the maximum specified (e.g., ICUMSA 45 typically specifies ≤ 0.04%)

Reducing Sugars:

• Reported as "Reducing Sugars: 0.02%" or "Invert Sugar: 0.02%"

• Test method is typically Lane-Eynon titration or HPLC

• Verify the result is ≤ the maximum specified (e.g., ICUMSA 45 typically specifies ≤ 0.03%)

For a detailed explanation of how each of these tests is performed and what the measurements represent, see how ICUMSA testing works.

Laboratory Accreditation and Signatures

The bottom of the COA should include:

• Laboratory accreditation — ISO/IEC 17025 certification number or equivalent

• Authorized signatures — typically two: the analyst who performed the test and a supervisor or quality manager who verified the results

• Laboratory contact information — address, phone, email for verification purposes

Verify that the laboratory is ISO 17025 accredited. This ensures the lab meets international standards for competence, impartiality, and consistent operation. Non-accredited laboratories produce COAs that may not be accepted by customs authorities, banks (for LC payments), or downstream buyers.

How to Read an SGS Inspection Report

An SGS inspection report covers both quality and quantity verification. Here's what each section confirms.

Quantity and Weight Verification

The inspection report states:

• Total weight loaded — in metric tonnes, verified by independent weighbridge or draft survey

• Number of bags or containers — confirms packaging quantity

• Tare weight — weight of packaging material (bags, containers) deducted from gross weight

Weight verification protects against short-shipment fraud. If your contract specifies 5,000 MT and the SGS report confirms 4,850 MT, you have documentary proof of the shortfall before the cargo leaves the origin port.

Quality Parameters

The SGS report typically references the attached Certificate of Analysis and confirms that sampling was performed according to ICUMSA standards. It may include a summary of key quality parameters (ICUMSA color, Pol%) but usually defers to the detailed COA for full test results.

The critical function of the SGS report in quality verification is witnessing the sampling process. An SGS inspector confirms that:

• Samples were taken from representative positions throughout the cargo (not just the top layer of one container)

• Samples were properly sealed and labeled

• Chain of custody was maintained from sampling to laboratory testing

This prevents sample substitution — a fraud tactic where suppliers submit high-quality samples for testing but ship lower-quality sugar.

Condition and Packaging Assessment

The SGS report includes a visual inspection section noting:

• Packaging condition — bags intact, no tears or contamination

• Moisture damage — any visible caking, clumping, or wetness

• Cleanliness — cargo free from foreign material, insects, or odors

• Container/vessel condition — suitable for food-grade cargo, no contamination risk

This section protects buyers from receiving sugar that's technically on-spec (per the COA) but arrives damaged or contaminated due to poor handling or storage at origin.

[IMAGE: Sample SGS inspection report showing quantity verification, quality summary, and condition assessment sections]

Key Quality Parameters to Verify

The table below summarizes what each parameter measures, acceptable ranges for common grades, and red flags that indicate problems.

Parameter	What It Measures	ICUMSA 45 Range	ICUMSA 150 Range	Red Flags
ICUMSA Color	Light absorbance / whiteness	≤ 45 IU	≤ 150 IU	Result exceeds contracted max; inconsistent with grade
Polarization (Pol%)	Sucrose content	≥ 99.8%	≥ 99.0%	Result below contracted min; suggests impurities or degradation
Moisture	Water content	≤ 0.04%	≤ 0.06%	Result above 0.10% indicates caking/microbial risk
Ash Content	Mineral residue	≤ 0.04%	≤ 0.07%	Elevated ash suggests incomplete refining or contamination
Reducing Sugars	Glucose + fructose	≤ 0.03%	≤ 0.10%	High levels indicate thermal degradation or storage issues

Acceptable ranges are for standard commercial contracts. Pharmaceutical or specialty applications may require tighter tolerances.

Red Flags — What Indicates a Problem Certificate

Experienced buyers can spot problematic certificates before committing payment or accepting delivery. Watch for:

1. COA results borderline or outside spec If your contract specifies ICUMSA ≤ 45 and the COA shows 44.8 IU, you're technically within spec — but barely. If the destination lab re-tests and gets 45.2 IU, you're off-spec. Borderline results increase dispute risk.

2. Test date significantly before shipment date If the COA is dated 30 days before the Bill of Lading, the test may not reflect the actual cargo quality. Sugar quality can degrade during storage; insist on recent testing (within 7 days of loading).

3. Non-accredited laboratory If the COA doesn't cite ISO 17025 accreditation, the results may not be reliable and likely won't be accepted by customs or LC issuing banks.

4. Missing or unclear sample reference The COA should clearly link the sample to your specific shipment. Vague references like "Brazilian sugar" or "Sample #123" without linking to a Bill of Lading raise suspicion.

5. SGS report missing or unverifiable If the supplier provides a COA but no SGS report, or the SGS report reference number can't be verified on SGS's website, the documentation is incomplete or potentially fraudulent.

6. Handwritten alterations or corrections Legitimate certificates are digitally printed with no manual corrections. Handwritten changes to test results are a major red flag for document fraud.

Common Certificate Fraud and How to Spot It

Certificate fraud occurs in bulk commodity trade, and sugar is no exception. Common tactics include:

Tactic 1: Fake certificates Suppliers create completely fabricated COAs and SGS reports using templates. Detection: verify the certificate reference number directly with the issuing laboratory or SGS office (not through the supplier). Legitimate certificates can be verified via phone or online portals.

Tactic 2: Certificate switching A supplier provides a legitimate certificate from a previous high-quality shipment but ships lower-quality sugar. Detection: ensure the certificate sample reference matches the current Bill of Lading and shipping documents exactly.

Tactic 3: Sample substitution The supplier submits high-quality samples for testing but loads lower-quality sugar. Detection: require independent inspection (SGS/Bureau Veritas) to witness sampling and maintain chain of custody.

Tactic 4: Altered certificates Legitimate certificates are scanned and digitally edited to change test results. Detection: request original certificates (not scans), verify directly with the issuing lab, and look for inconsistent fonts or formatting.

Protection strategy: Always verify certificates independently. Call the laboratory or SGS office and provide the certificate reference number. Legitimate issuers maintain records and can confirm authenticity within minutes. Never rely solely on documents provided by the supplier.

When to Request Re-Testing or Reject a Shipment

Buyers have the right to reject shipments or request re-testing when documentation indicates quality problems. Here's when to exercise those rights:

Reject immediately if:

• COA shows results clearly outside contracted specifications (e.g., ICUMSA 52 when ≤ 45 was specified)

• Certificates cannot be verified as authentic through independent channels

• SGS report indicates cargo damage, contamination, or short-shipment beyond contractual tolerance

• Test dates are so old they don't reliably represent the shipped cargo

Request re-testing if:

• Results are borderline (within 1–2% of spec limits) and you want confirmation before accepting

• There's a discrepancy between origin COA and your destination lab results

• The cargo shows visible signs of quality degradation (caking, moisture, off-color) that contradict the COA

Accept with documentation if:

• All parameters meet or exceed contracted specifications

• Certificates are recent, verifiable, and issued by accredited entities

• SGS report confirms proper quantity, condition, and sampling procedures

Most quality disputes in sugar trade stem from poor certificate review at the contracting stage. Buyers who don't verify documentation until after payment has been released or the cargo has left origin port have limited recourse. Professional buyers verify certificates before issuing payment instructions or opening Letters of Credit.

For comprehensive guidance on evaluating suppliers beyond just certificate review, see our guide to choosing a sugar supplier.

Learn More About Sugar Inspection and Quality

Sugar quality certificates are the documentary foundation of professional bulk sugar procurement. A buyer who can read these documents confidently, verify their authenticity, and spot red flags before committing payment is a buyer protected against fraud, quality disputes, and costly cargo rejections.

For a comprehensive overview of sugar grading and what the test results on these certificates actually measure, see our ICUMSA ratings guide.

Ready to source sugar with verified quality documentation and independent inspection? Contact us to discuss your requirements — we supply bulk sugar on FOB, CIF, and CFR terms with full SGS inspection at origin, accredited laboratory testing, and complete certificate verification support.