China GB Standards for Water Treatment Chemicals
China is the world’s largest producer and exporter of water treatment chemicals, supplying coagulants, flocculants, disinfectants, and adsorbents to municipal and industrial buyers across every continent. For international buyers, understanding China GB standards for water treatment chemicals is essential to verifying product quality, ensuring regulatory compliance, and avoiding costly rejection at the destination port. The GB (Guobiao, or “national standard”) system defines the technical specifications, test methods, and acceptance criteria that govern how these chemicals are manufactured, tested, and certified in China.
This guide explains the structure of the Chinese standards system, details the key GB standards for major water treatment chemicals including polyaluminium chloride (PAC) and polyacrylamide (PAM), outlines the certification process, and compares Chinese standards with international benchmarks such as NSF/ANSI and EN. A reference table summarises the standards buyers most often encounter.
Overview of the Chinese Standards System
China operates a multi-tier national standards system administered by the Standardization Administration of the People’s Republic of China (SAC) and published as Guobiao standards. The tiers relevant to water treatment chemicals are:
- GB (mandatory national standard): Binding standards protecting human health, safety, and the environment. Compliance is legally required for products placed on the Chinese market.
- GB/T (recommended national standard): Voluntary technical standards that define product specifications, test methods, and quality grades. While technically recommended, GB/T standards become binding when cited in contracts, regulations, or product certification schemes.
- HB, QB, and industry standards: Sector-specific standards (chemical industry HG, light industry QB) that may apply when no GB standard exists.
- Enterprise standards (Q/): Manufacturer-specific standards that must meet or exceed the relevant GB or GB/T standard and are filed with local authorities.
For water treatment chemicals, the relevant standards are typically issued by the National Technical Committee on Chemicals (SAC/TC 63) and the technical committee on water treatment. Standards are reviewed and revised on roughly a five-year cycle, so buyers should always confirm they are referencing the current edition.
Relationship to Drinking Water Compliance
It is important to distinguish between product quality standards, which define the chemical composition and purity of the product, and drinking water safety standards, which limit what may be dosed into potable water. China’s drinking water quality is governed by GB 5749 (Standards for Drinking Water Quality), while the hygienic safety of chemicals used in drinking water treatment is governed by GB/T 17218 (Hygienic Safety Evaluation for Chemicals Used in Drinking Water Treatment) and the associated Ministry of Health certification. A product that meets its composition GB standard is not automatically approved for potable use; it must also pass the hygienic safety evaluation.
Key GB Standards for Water Treatment Chemicals
Polyaluminium Chloride (PAC) — GB/T 22627
The principal standard for PAC used in water treatment is GB/T 22627, “Water treatment agent — Polyaluminium chloride.” It classifies PAC into grades by alumina (Al2O3) content and basicity, and sets limits on impurities such as iron, insoluble matter, and heavy metals (lead, cadmium, arsenic, mercury). The standard covers both liquid and solid products and includes test methods for pH, density, and basicity.
For drinking water grade PAC, buyers should additionally confirm compliance with the hygienic safety requirements under GB/T 17218, which imposes stricter heavy metal limits than the industrial grade. Distinguishing between industrial grade and drinking water grade is one of the most common compliance pitfalls for importers.
Polyacrylamide (PAM) — GB 17514
GB 17514, “Water treatment agent — Polyacrylamide,” governs the quality of PAM used as a flocculant. The standard specifies the degree of polymerisation (molecular weight), degree of hydrolysis (ionic character), solid content, and dissolution time. Critically for drinking water use, GB 17514 sets a strict limit on residual acrylamide monomer, a neurotoxin and probable carcinogen. The drinking water grade permits a much lower residual acrylamide level than the industrial grade.
Because PAM is dosed as a dilute solution and is not intended to remain in the treated water, the residual monomer limit is the primary safety parameter. Importers of PAM for potable treatment must request the residual acrylamide certificate and verify it against the destination country’s own limit.
Activated Carbon — GB/T 7701 and GB/T 12496
Activated carbon for water treatment is covered by GB/T 7701, which defines product specifications including iodine number, methylene blue adsorption, abrasion number, particle size, and ash content. The companion standard GB/T 12496 provides the corresponding test methods. For drinking water grade granular activated carbon (GAC), buyers should also confirm compliance with the hygienic safety evaluation, including limits on heavy metals that could leach from the carbon into treated water.
Sodium Dichloroisocyanurate (SDIC) — GB/T 10666
GB/T 10666 specifies the requirements for sodium dichloroisocyanurate, a stabilised chlorine donor used for disinfection. The standard defines available chlorine content, moisture, and pH of the aqueous solution. Because SDIC releases cyanuric acid, which stabilises chlorine against UV degradation, its use in indoor potable systems may be restricted; buyers should check destination regulations alongside the GB specification.
Trichloroisocyanuric Acid (TCCA) — GB/T 10666 and HG/T standards
Trichloroisocyanuric acid (TCCA) shares much of its specification framework with SDIC under the broader chlorinated isocyanurate family, with available chlorine content (typically 90 percent minimum) as the defining parameter. TCCA is widely used for swimming pool, circulating cooling water, and industrial disinfection. Importers should verify available chlorine, moisture, and the absence of excessive insolubles.
Other Relevant Chemicals
- Sodium hypochlorite: GB 19106 specifies available chlorine, free alkali, and heavy metal limits for the bleach used in water disinfection.
- Aluminium sulfate: HG/T 2227 governs the coagulant alum, an alternative to PAC for certain plants.
- Polymeric ferric sulfate (PFS): GB/T 14591 specifies this inorganic coagulant, including total iron, ferrous iron, and salt base content.
- COD remover: For industrial wastewater, products such as COD removers are typically governed by enterprise or industry standards rather than a dedicated GB standard; buyers should request the Q/ enterprise standard and performance test data.
Standards Reference Table
| Chemical | GB Standard | Title (Summary) | Key Parameters |
|---|---|---|---|
| Polyaluminium chloride (PAC) | GB/T 22627 | Water treatment agent — Polyaluminium chloride | Al2O3 content, basicity, insolubles, heavy metals |
| Polyacrylamide (PAM) | GB 17514 | Water treatment agent — Polyacrylamide | Molecular weight, degree of hydrolysis, residual acrylamide |
| Activated carbon | GB/T 7701 | Specifications for coal-based granular activated carbon | Iodine number, methylene blue, abrasion, ash |
| Activated carbon test methods | GB/T 12496 | Test methods for granular activated carbon | Standardised analytical procedures |
| SDIC | GB/T 10666 | Sodium dichloroisocyanurate | Available chlorine, moisture, pH |
| TCCA | GB/T 10666 (family) / HG/T | Trichloroisocyanuric acid | Available chlorine (90% min.), moisture |
| Sodium hypochlorite | GB 19106 | Sodium hypochlorite solution | Available chlorine, free alkali, heavy metals |
| Polymeric ferric sulfate | GB/T 14591 | Water treatment agent — Polymeric ferric sulfate | Total iron, ferrous iron, salt base |
| Aluminium sulfate | HG/T 2227 | Water treatment agent — Aluminium sulfate | Al2O3 content, insolubles, iron, free acid |
| Drinking water quality | GB 5749 | Standards for drinking water quality | 97 regulated parameters, microbial, chemical, radiological |
| Chemical hygienic safety | GB/T 17218 | Hygienic safety evaluation for drinking water treatment chemicals | Leaching tests, toxicology, heavy metals |
Testing Methods and Laboratory Verification
Each GB product standard references a companion test method standard, ensuring that laboratories across China and overseas use identical analytical procedures. Key analytical concepts include:
- Available chlorine for disinfectants, determined iodometrically by titration with sodium thiosulfate.
- Alumina (Al2O3) for PAC, determined by complexometric EDTA titration or instrumental methods.
- Residual acrylamide monomer for PAM, determined by bromination or, increasingly, by high-performance liquid chromatography (HPLC) for greater accuracy at trace levels.
- Iodine and methylene blue numbers for activated carbon, which quantify the adsorption capacity for small and larger pore molecules respectively.
- Heavy metals (lead, cadmium, arsenic, mercury, chromium), determined by atomic absorption spectroscopy (AAS) or inductively coupled plasma (ICP-OES/MS).
Reputable manufacturers issue a Certificate of Analysis (CoA) for every batch, reporting each parameter against the GB limit. Importers should retain these CoAs as part of their quality and regulatory documentation.
Certification and Compliance Process
1. Hygienic Licence for Drinking Water Treatment Chemicals
For any chemical dosed into drinking water in China, the manufacturer must obtain a hygienic licence from the relevant provincial health authority or the National Health Commission. The licence confirms that the product passed the GB/T 17218 hygienic safety evaluation, including leaching tests that simulate dosing at 10 times the typical concentration and analysis of the leachate for regulated contaminants. The licence number and issuing authority must appear on the product label.
2. Product Type Testing
Manufacturers submit samples to an accredited laboratory (typically CNAS-accredited) for type testing against the relevant GB or GB/T standard. The resulting test report is valid for a defined period and supports the hygienic licence application.
3. Factory Quality Management
Most manufacturers maintain ISO 9001 quality management systems, and many pursue additional certifications such as ISO 14001 and ISO 45001. While not mandatory under GB, these systems underpin consistent batch-to-batch compliance and are often required by international buyers.
4. Batch Release Testing
Each production batch is tested internally against the GB specification before release. The CoA records the actual measured values and confirms conformance. Buyers may request third-party re-testing of shipped samples for verification.
Compliance Requirements for Importers
Importing Chinese water treatment chemicals involves meeting both the exporting country’s GB requirements and the importing country’s regulatory regime. Key steps for B2B importers:
- Specify the correct grade. Distinguish clearly between industrial grade and drinking water grade. Request the hygienic licence for any potable-grade product.
- Reference the current GB standard in the contract. Cite the standard number, edition year, and grade to avoid ambiguity. For example, “PAC conforming to GB/T 22627, drinking water grade.”
- Require a CoA per batch listing all GB parameters with measured values and the laboratory’s accreditation.
- Verify heavy metal and residual monomer limits against the destination country’s drinking water regulations, which may be stricter than the GB.
- Request sample pre-shipment testing by an independent lab, especially for first-time suppliers or when switching grades.
- Confirm packaging and labelling comply with the GB standard and with the Globally Harmonized System (GHS) for the destination market.
- Maintain a traceability file linking each delivery to its CoA, hygienic licence, and customs documentation for audit purposes.
Comparison with International Standards
Chinese GB standards are broadly aligned in principle with international counterparts but differ in detail. Understanding these differences helps importers reconcile documents and avoid compliance gaps.
Comparison with NSF/ANSI Standard 60
The US NSF/ANSI Standard 60 certifies drinking water treatment chemicals based on the contaminants that leach into treated water at the maximum use dose. While GB/T 17218 also conducts leaching tests, NSF/ANSI 60 uses a normalised maximum contaminant level (MCL) approach tied to US EPA drinking water limits. Products certified to NSF/ANSI 60 are widely accepted in North America and many other markets; GB certification is accepted in China and increasingly in Belt and Road markets but is not a substitute for NSF/ANSI 60 in jurisdictions that require it.
Comparison with European EN Standards
European standards for water treatment chemicals are consolidated in the EN standards, many developed under CEN/TC 164 (Water supply). For example, EN 1407 covers polyacrylamide-based flocculants for drinking water, and EN 886 covers aluminium-based coagulants. The European approach also mandates compliance with the EU Drinking Water Directive (recast 2020/2184) and national approvals. Chinese GB standards and European EN standards both define product purity and residual monomer or heavy metal limits, but the specific numerical limits and test methods differ. A product meeting GB may require additional testing to demonstrate EN compliance, and vice versa.
Key Differences at a Glance
| Aspect | China GB | US NSF/ANSI 60 | European EN |
|---|---|---|---|
| Scope | Product composition + hygienic safety | Drinking water chemical safety (leaching) | Product purity + national approval |
| Basis of limits | GB 5749 drinking water limits | US EPA MCLs, normalised to dose | EU Drinking Water Directive |
| PAM residual acrylamide | GB 17514 sets grade limits | NSF 60 limits leachable acrylamide | EN 1407 sets residual monomer limit |
| Certification body | NHC / provincial health authority | NSF, UL, WQA (accredited certifiers) | National bodies per member state |
| Market acceptance | China, growing in BRI markets | North America, widely accepted | EU member states |
Practical Tips for Working with Chinese Suppliers
- Ask for the standard number on the CoA. A CoA that simply lists parameters without referencing the governing GB standard is a red flag.
- Confirm the hygienic licence is current and issued for the specific product grade and form (liquid vs solid).
- Watch for grade substitution. Some suppliers quote drinking water grade pricing but ship industrial grade. Pre-shipment sampling and CoA verification mitigate this risk.
- Request SDS in both Chinese and English aligned with GHS, and confirm the classification matches the GB product standard.
- Build a long-term specification that combines the GB reference with any tighter limits required by the destination country, so there is no ambiguity at inspection.
Frequently Asked Questions
What is the difference between GB and GB/T?
GB denotes a mandatory national standard, legally binding for products placed on the Chinese market. GB/T denotes a recommended national standard that is voluntary in principle but becomes binding when cited in a contract, regulation, or certification scheme. Most water treatment chemical product specifications are GB/T, while drinking water quality (GB 5749) is mandatory GB.
Does a GB-certified PAC meet US drinking water requirements?
Not automatically. GB/T 22627 and the GB/T 17218 hygienic evaluation confirm compliance with Chinese requirements, but US potable use requires NSF/ANSI 60 certification and sometimes state-level approval. Importers should obtain GB documentation for quality verification and NSF/ANSI 60 certification separately for US compliance.
How is residual acrylamide limited in PAM?
GB 17514 sets a residual acrylamide monomer limit that is much stricter for drinking water grade than for industrial grade. The limit is verified by bromination titration or HPLC. Importers of potable-grade PAM must request the residual acrylamide certificate and compare it against the destination country’s own limit.
How often are GB standards revised?
GB standards are reviewed on approximately a five-year cycle. Revisions update test methods, tighten impurity limits, and align with international practice. Buyers should always confirm the edition year cited on the CoA and ensure contracts reference the current edition.
Are enterprise (Q/) standards acceptable for products without a GB standard?
Yes. Where no GB or GB/T standard exists, manufacturers file an enterprise standard (Q/) that must meet or exceed any relevant industry standard. The Q/ standard should be filed with local authorities and provided to buyers with the CoA. For specialised products such as some COD removers, the Q/ standard plus performance test data is the typical basis of specification.
Conclusion
Navigating China GB standards for water treatment chemicals is a core competency for any B2B buyer sourcing from the world’s largest chemical supply base. By understanding the GB and GB/T tier system, knowing the key product standards — from GB/T 22627 for PAC and GB 17514 for PAM to GB/T 7701 for activated carbon and GB/T 10666 for chlorinated isocyanurates — and reconciling them with NSF/ANSI 60 and EN requirements, importers can specify the correct grade, verify quality through CoAs and hygienic licences, and build a defensible compliance file. Combining rigorous GB compliance with destination-country certification ensures that the chemicals delivered perform as specified and meet every regulatory threshold along the supply chain.