1. Introduction

1.1 Why Quality Inspection Matters When Buying Fumaric Acid

Fumaric acid is widely used in food additives, animal feed, unsaturated polyester resin, coatings and chemical synthesis. Differences in purity, moisture content and impurities can affect the performance and stability of downstream products.

For food and feed applications, particular attention should be paid to heavy metals and maleic acid content. Results that exceed the applicable limits may lead to compliance issues and affect market access.

When purchasing from a fumaric acid china factory, buyers should therefore pay attention not only to the quoted price but also to the manufacturer's quality control procedures and batch test records.

SNOWHITE CHEMICAL supplies food & feed grade and industrial grade fumaric acid, with a batch COA provided for each shipment.

1.2 Related Articles on Fumaric Acid Selection and Storage

In our previous articles, we covered how to select the right fumaric acid grade and how to prevent caking during storage.

Once the appropriate grade and storage conditions have been confirmed, checking product quality is another important step before shipment. The following sections explain the main quality indicators and inspection methods to help buyers evaluate their orders.

2. Core Quality Indicators for Food & Feed Grade and Industrial Grade Fumaric Acid

2.1 Food & Feed Grade Fumaric Acid Specifications

Our food grade and feed grade fumaric acid share the same quality standard. The main indicators include purity, moisture, residue on ignition, maleic acid, arsenic and heavy metals.

Maleic acid is one of the key impurities to monitor in food & feed grade fumaric acid and is normally controlled below 0.1%.

The minimum purity is 99.5%, while moisture content is limited to 0.5% or less. These specifications help maintain product quality during transportation and storage.

For food and feed applications, buyers should also check that the relevant impurity levels comply with the requirements of their intended market.

2.2 Industrial Grade Fumaric Acid Specifications

Industrial grade fumaric acid is mainly used in unsaturated polyester resin, inks and industrial pH adjustment.

Compared with food & feed grade, industrial grade fumaric acid has different requirements for certain indicators, particularly heavy metals and arsenic. However, purity and impurity control remain important, especially for applications where product consistency affects resin reaction performance.

For many resin manufacturers, purchasing industrial grade fumaric acid directly from a Chinese manufacturer is a practical way to control costs while maintaining a stable supply.

2.3 Comparing the Two Grades

Food & feed grade and industrial grade fumaric acid are intended for different applications, so their specifications should be evaluated according to the relevant end-use requirements.

SNOWHITE CHEMICAL can provide product specifications based on Chinese national standards and common international requirements. Test items can also be discussed according to the import regulations and quality requirements of the destination market.

3. Common Testing Methods for Fumaric Acid

3.1 HPLC (High-Performance Liquid Chromatography)

HPLC is commonly used to determine fumaric acid purity and maleic acid content. It separates fumaric acid from similar organic acid impurities, allowing their concentrations to be measured accurately.

This method is widely used by professional laboratories and third-party inspection agencies, including SGS.

3.2 Titration and Loss on Drying

Titration is another method used for routine purity testing.

Moisture content is generally checked through a loss on drying test. This indicator is important because excessive moisture can increase the risk of caking during transportation and storage, as discussed in our previous storage guide.

Both tests are part of routine quality inspection during fumaric acid production.

3.3 Heavy Metal and Arsenic Testing

Heavy metal and arsenic testing is particularly important for food & feed grade fumaric acid.

These indicators help buyers verify whether the product meets the relevant safety and quality requirements for its intended application.

SNOWHITE CHEMICAL also supports third-party sampling and inspection before loading, allowing customers to arrange additional testing when required.

4. How to Read a COA (Certificate of Analysis)

4.1 Check the Basic Batch Information

Before reviewing the test results, check the basic information on the COA, including:

• Batch number

• Production date

• Expiry date

• Product grade (food & feed grade or industrial grade)

The batch number is particularly important. Make sure the COA corresponds to the exact batch of fumaric acid being purchased, rather than a previous production batch or a general product specification sheet.

4.2 Compare Test Results with the Required Specifications

After confirming the batch information, compare each test result with the agreed product specifications.

Pay particular attention to purity, moisture, maleic acid, residue on ignition, arsenic and heavy metals, depending on the product grade.

If any result exceeds the agreed limit, the batch should be reviewed before acceptance. For food and feed applications, even one non-compliant indicator may affect whether the product can be used for its intended purpose.

4.3 Other Documents to Check Alongside the COA

In addition to the COA, buyers may need the following documents when purchasing fumaric acid:

• TDS (Technical Data Sheet): Provides product specifications and technical information.

• SDS (Safety Data Sheet): Covers product handling, storage and safety precautions.

• COA (Certificate of Analysis): Shows the actual test results for a specific production batch.

SNOWHITE CHEMICAL can provide TDS, SDS and batch COA. Relevant qualification documents for food grade fumaric acid are also available upon request.

5. Quality Control at SNOWHITE CHEMICAL

5.1 Raw Material Inspection Before Production

Raw materials are checked before production to help prevent unwanted impurities from entering the manufacturing process.

5.2 In-Process Sampling and Inspection

During production, our QC team takes samples at regular intervals to monitor product quality and maintain consistency between batches.

5.3 Final Inspection Before Packing and Shipment

Finished fumaric acid is tested before packing and shipment to verify that the batch meets the required specifications.

We also support pre-shipment inspection and sample delivery for customers who wish to conduct their own laboratory tests before confirming shipment.

6. Frequently Asked Questions

6.1 Can Food & Feed Grade Fumaric Acid Be Used for Resin Production?

Yes. Food & feed grade fumaric acid can technically be used in resin production. However, it generally costs more than industrial grade.

For this reason, most resin manufacturers choose industrial grade fumaric acid when food-grade purity is not required.

6.2 Is Third-Party Testing Necessary if the COA Meets the Specifications?

It depends on the buyer's requirements and local import regulations.

A batch COA provides the manufacturer's test results, but some buyers may still require independent verification before shipment.

SNOWHITE CHEMICAL accepts third-party inspections, including SGS, at our factory warehouse.

6.3 What If the Test Results After Arrival Differ from the COA?

If the test results after arrival are inconsistent with the COA, the first step is to review the sampling and testing procedures.

SNOWHITE CHEMICAL will coordinate an investigation covering the batch records, packaging, transportation conditions and sampling methods, and work with the customer to identify the cause and provide an appropriate solution.

7. Conclusion

Quality inspection and COA verification are important parts of purchasing fumaric acid, particularly for bulk orders and applications with strict quality requirements.

Understanding the key specifications, testing methods and batch information helps buyers evaluate product quality before shipment and reduce potential procurement risks.

SNOWHITE CHEMICAL supplies food & feed grade and industrial grade fumaric acid with batch test records. If you need free samples, a detailed specification sheet or further product information, please contact our sales team.