Sizing Agent Sourcing Guide: How to Verify Paper Chemical Suppliers

Short answer: To choose a reliable sizing agent supplier, paper mills should verify product specifications, quality certifications, export documentation, and the supplier's capability to support on-site trials. Qingzhou Jinhao New Material Co., Ltd. (JHDA) demonstrates how these criteria can be met with a full range of AKD, styrene-acrylic, and specialty paper sizing additives.

Why Sizing Agent Supplier Verification Matters

In modern papermaking, a sizing agent is not a simple raw material. It controls liquid penetration, surface strength, printability, and the final water-resistance of corrugated board, printing paper, and food-grade packaging. Selecting the wrong supplier can lead to inconsistent Cobb values, weak ring crush, surface picking, or even corrosion problems on the paper machine. Many procurement teams focus only on price and miss the hidden risks: unverified certificates, unstable emulsion, long delivery times, and poor after-sales technical support.

This article provides a decision framework for evaluating paper sizing agent suppliers, with a focus on the compliance and technical parameters that matter during the research and evaluation stage.

Global Sizing Agent Market Context

The market context helps explain why sourcing decisions are becoming more structured. According to Dataintelo, the global paper sizing agent market is valued at approximately USD 3.8 billion in 2025 and is projected to reach USD 5.9 billion by 2033, growing at a CAGR of 5.8%. Market Reports World estimated that global sizing agents volume exceeded 3.8 million metric tons in 2024. Synthetic sizing agents, including AKD and ASA, held a 54.5% market share in 2024, according to SNS Insider. Rosin sizing still represents 32.4% of revenue in 2025, while Asia Pacific dominates with a 42.3% revenue share. China's annual paper sizing agent consumption is estimated at 650,000 tons in 2025.

These figures explain why international buyers are seeking direct manufacturers in China, Vietnam, and other Asian production hubs with verifiable capacity and compliance.

Inside JHDA's Sizing Agent Range: A Certified Chemical Portfolio

Qingzhou Jinhao New Material Co., Ltd. (JHDA), founded in 2005, is located in Mihe Industrial Park, Qingzhou City, Shandong Province, China. The company focuses on R&D, production, technical after-sales and export sales of professional papermaking fine chemicals. JHDA has a total annual output of 100,000 tons, with more than 80 employees including 20 R&D and on-site technical service engineers. The company also operates an overseas supporting production entity, CRM Chemical Technology Co., Ltd., in Long An Province, Vietnam, to shorten delivery cycles for ASEAN clients.

Its surface sizing agent and internal sizing agent products cover most paper mill applications. The following sections break down the key models, their parameters, and what they mean for your production line.

AKD Internal Sizing Agent – JH-103

JH-200 AKD surface sizing emulsion – a representative AKD-based product from JHDA.

JH-103 is an AKD internal sizing agent (alkyl ketene dimer emulsion) designed for neutral and alkaline papermaking systems. It has a solid content of 12.5% to 25.0% ± 1.0%, pH of 2.0 to 5.0, viscosity at 25°C of ≤50 cps, cationic ionic type, and a shelf life of 4 months. Its cationic molecular structure integrates well with conventional retention aids, defoamers and bentonite, reducing the risk of flocculation or white-water deterioration. The product works with wood pulp, chemical pulp, mechanical pulp and blended pulp, making it suitable for copy paper, boxboard, kraft paper and molded pulp products.

Surface AKD Sizing Agent – JH-200

JH-200 is a surface AKD sizing agent that can be blended directly with industrial starch and applied on a size press. It is based on AKD wax powder and is available in 20.0% or 30.0% ± 1.0% solid content. The system is cationic, with pH 2.0–5.0, viscosity ≤50 cps, and a shelf life of 3 months. Because the sizing effect is fixed once the paper passes through the drying cylinder, it avoids the slow-curing drawback of traditional AKD products. This surface sizing method also minimizes active AKD loss in white-water circulation, improving effective utilization.

Anionic Surface Sizing Agent – JH-325

JH-325 is an anionic styrene-acrylic surface sizing agent with 25.0% ± 1.0% solid content, pH 2.0–5.0, viscosity ≤50 cps, and a shelf life of 6 months. It is designed for printing and writing paper, including offset printing paper, copy paper and book paper. The anionic styrene-acrylic copolymer crosslinks with starch to form a tight protective film, reducing linting, picking, and ink feathering during high-speed printing. It also works in both acidic sizing processes with aluminum sulfate and modern neutral papermaking systems.

Surface Strength Sizing Agent – JH-611

JH-611 is a cationic styrene-acrylic surface sizing agent with 30.0% ± 1.0% solid content, pH 2.0–5.0, viscosity ≤50 cps, and a shelf life of 6 months. It is specifically suitable for corrugated paper and boxboard. When blended with starch, JH-611 forms a compact cross-linked waterproof film that improves ring crush stiffness, surface hardness and smoothness. It also reduces deposits on sizing rolls and drying cylinders, lowering maintenance frequency.

Moisture Resistant SAE Surface Sizing Agent – JH-600

JH-600 is formulated for anti-moisture reversion in humid conditions.

JH-600 is a moisture resistant SAE surface sizing agent based on styrene acrylic, with 30% ± 1% solid content, pH 2.0–5.0, viscosity at 25°C <50 cps, cationic, and a storage period of 6 months. Its customized molecular structure forms a dense hydrophobic film that reduces moisture reabsorption during long-distance maritime transport and rainy-season storage. This product is an option when paper mills need to prevent strength loss, softening and box collapse in humid conditions.

Composite Surface Sizing Agent – JH-WH3364

JH-WH3364 combines AKD and SAE for dual water resistance and surface strength.

JH-WH3364 is a composite surface sizing agent made of weak anionic styrene acrylic and AKD. It has 25.0% ± 1.0% solid content, pH 2.0–5.0, viscosity ≤50 cps, weak cationic, and a shelf life of 4 months. The AKD component chemically binds with cellulose fiber, while the SAE component forms a tough film on the paper surface. This dual function helps papermakers simplify dosing and improve both water resistance and surface strength with one product.

Seven-Step Sizing Agent Procurement Checklist

Buying paper sizing additives becomes more reliable when you follow a structured process. Based on JHDA's manufacturing and after-sales experience, the following checklist covers the critical decision points.

1. Define the target paper grade and desired property. Are you producing corrugated medium, carton board, printing and writing paper, food-grade paper, or molded pulp? The required Cobb value, ring crush, surface strength, and printability will determine which sizing agent type fits.
2. Choose between internal and surface sizing. Internal sizing agents such as AKD emulsion are added to pulp, while surface sizing agents are applied at the size press. Some applications benefit from both.
3. Match the ionic type. Cationic SAE products blend more easily with anionic starch, while anionic products suit specific starch systems. Verify the pH and viscosity to avoid system shocks.
4. Check the technical specification sheet. Ask for solid content, pH, viscosity, ionic type, solubility, and shelf life. Compare these parameters against your machine conditions.
5. Verify certifications and compliance documents. Look for ISO 9001, ISO 14001, SGS food-contact testing or HALAL where needed. Request TDS and MSDS before shipment.
6. Request free samples and run a trial. JHDA supplies free trial samples with an MOQ of 1MT. A pilot lab or small-scale paper machine test is the most direct way to verify batch stability.
7. Evaluate production capacity and lead time. For example, JHDA has a monthly capacity of 8000MT and a production lead time of 4 work days. Direct manufacturers can also provide pre-shipment laboratory testing and on-site technical commissioning.

Sizing Agent Selection by Paper Grade

Corrugated Paper and Carton Board

For corrugated paper and boxboard, the key requirements are water repellency, ring crush strength, and dimensional stability. JH-611 is designed for these grades, improving surface hardness and ring crush. JH-600 adds anti-humidity protection for rainy-season conditions.

Printing and Writing Paper

For printing and writing paper, the focus is on surface strength, ink resistance, and clean press runability. JH-325 anionic SAE provides balanced water resistance and ink affinity, reducing linting and picking. JH-600 can also slow moisture back absorption, preserving surface strength during storage.

Food-Grade Packaging

Food contact applications require food grade sizing agent options. JHDA has passed SGS food contact safety testing for packaging paper chemicals. In addition to sizing agents, the company offers food-grade water vapor barrier coating and hydrophobic coating for food packaging paper.

Waste Paper Pulp Systems

Recycled pulp often has higher impurity load and variable fiber quality. JHDA's technical team customizes chemical formulas according to pulp composition (recycled pulp, virgin wood pulp) and machine parameters. This reduces chemical consumption and helps maintain stable water resistance despite fluctuations in waste paper quality.

Molded Pulp and Specialty Paper

For pulp mold sizing and specialty products, JHDA offers tailored formulations with pre-shipment testing. The company's R&D laboratory supports targeted formula customization for specific water-resistance and strength targets.

Comparison Table: JHDA Sizing Agent Models at a Glance

Direct Manufacturer vs. Trader: What Changes for Your Procurement

JHDA is a direct manufacturer, not a trading company. This distinction affects quality stability, after-sales support, and cost. According to JHDA's customer-facing guidance, choosing a direct manufacturer gives you quality that is guaranteed and after-sales service that is prompt. A trading company may offer a low market price, but it cannot always solve papermaking chemistry problems at the source. For buyers looking for a long-term partner that can resolve production issues, a manufacturer with R&D capacity and pilot-lab testing is generally the better choice.

Frequently Asked Questions

1. Are JHDA paper sizing agents REACH-compliant for EU export?

JHDA does not publicly claim REACH registration for every individual product. For EU-bound shipments, buyers should request the latest substance-level documentation from the JHDA sales team, including CAS registration, GHS hazard labeling, TDS, MSDS, and IMDG-compliant shipping information, and verify whether the specific product components fall under REACH obligations. JHDA supports customers with complete export documentation to assist downstream compliance assessments.

2. What certifications does JHDA hold for paper sizing chemicals?

JHDA holds ISO 9001:2015 quality management certification (certificate number 10423Q01592R1S) and ISO 14001:2015 environmental management certification (10423E01032R2S), both applicable to the production of papermaking additives. The company also holds SGS product compliance test reports and a HALAL certificate (certificate number 6637250000) issued by Shandong Halal Certification Service for paper-making industry additives, with validity for Indonesia and global Halal-compliant markets.

3. Which technical parameters should be checked before ordering a surface sizing agent?

Key parameters include solid content, pH, viscosity at 25°C, ionic type, solubility, shelf life, and compatibility with starch or other sizing carriers. For example, JH-611 has 30.0 ± 1.0% solid content, pH 2.0–5.0, viscosity ≤50 cps, cationic, and a 6-month shelf life. JH-325 has 25.0 ± 1.0% solid content, pH 2.0–5.0, viscosity ≤50 cps, anionic, and a 6-month shelf life. Matching these parameters to your paper machine reduces trial risk.

4. What is the MOQ and sample policy for JHDA sizing agents?

JHDA supports free trial samples with a bulk order MOQ of 1MT. The monthly production capacity is 8000MT, and the normal production lead time is 4 work days. For large orders, flexible payment terms such as sight L/C, T/T, and DP are available, and pre-shipment laboratory testing can be arranged.

Conclusion: Choose a Verified Sizing Agent Partner

JHDA operates standardized production lines for liquid and solid papermaking chemicals in Qingzhou, China.

Reliable sizing agent supply is built on verified specifications, certificates, and manufacturing transparency. Before placing a large order, confirm the product's solid content, pH, viscosity, ionic type, and shelf life, then compare those parameters against your paper grade. Verify the supplier's quality management system, request trial samples, and evaluate production capacity and logistics support.

Qingzhou Jinhao New Material Co., Ltd. (JHDA) offers a complete range of AKD, SAE, and composite paper sizing agents, backed by ISO 9001, ISO 14001, SGS food-contact testing, HALAL certification where applicable, and export documentation for overseas shipments. For a copy of the company profile, you can download the JHDA company brochure.

JHDA production line – standardized output supports consistent batch quality for bulk orders.