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Selecting the right chemical foaming agent determines cell structure uniformity, weight reduction efficiency, surface quality, and whether your finished part passes environmental or regulatory standards. Zhejiang Joysun Advanced Material Co., Ltd. is a professional chemical foaming agent manufacturer with over 20 years of production experience, independent synthesis capability, and a full portfolio spanning ADC, OBSH, TSH, TSSC, DPT, and custom pre-dispersed masterbatch formats. The lineup is organized by application — not just chemistry — so engineers can match the right grade to their process without extensive trial-and-error.
A chemical foaming agent (CFA) is a solid compound that decomposes at a defined temperature range, releasing gas — primarily nitrogen (N₂), carbon dioxide (CO₂), or a combination — into the polymer melt. The gas expands to form a cellular structure inside the part. The practical performance of a CFA depends on four variables working together: decomposition temperature, gas yield, decomposition rate, and the nature of the gas and residual byproducts.
Decomposition temperature must sit within the processing window of the base polymer. Use a CFA that decomposes too early, and you lose gas before the mold closes or before extrusion pressure is sufficient to maintain cell structure. Use one that decomposes too late, and the melt has already solidified before foaming begins, resulting in collapsed or absent cells. Decomposition temperature also has to account for activators, since some systems use metal-based activators (zinc oxide, zinc stearate) to lower the effective decomposition point of ADC-based systems.
Gas yield, measured in mL/g, directly affects weight reduction efficiency at a given loading level. A grade with 220 mL/g gas yield requires a lower dosage to achieve the same density reduction compared to a grade at 140 mL/g. This has a direct impact on cost per part, compounding behavior, and residue levels in the finished product.
Residual decomposition products matter for odor, color, regulatory compliance, and downstream processing. ADC-based systems historically produce formamide and ammonia as decomposition byproducts, which are regulated in children's footwear and consumer goods under European standards including REACH. Buyers sourcing for these markets need formamide and ammonia values controlled at the parts-per-million level, not just "low" by general industry standards.
Joysun's chemical foaming agents are grouped by end market and processing type, covering footwear, automotive, packaging foam, engineering plastics, cross-linked foam, 3D printing, and building products. Each group has grades optimized for specific base resins, processing temperatures, and performance requirements.
Foaming agents for footwear applications address TPR, EVA, and TPU substrates across injection and compression molding. Grade NH269 (decomposition temperature 150°C, gas yield 175 mL/g) is a composite endothermic-exothermic balanced foaming agent for TPR footwear foaming. Grade NH298-3 (decomposition temperature 155°C, gas yield 190 mL/g) targets EVA shoe outsole injection foaming with low shrinkage and strong weight reduction performance. Grade NH369-1 (decomposition temperature 155°C, gas yield 200 mL/g) covers EVA and EVA/PVC blended outsole systems with the same low-shrinkage, high-weight-reduction profile. Grade TP204NS is a dust-free granular grade developed for TPU footwear one-shot molding, providing high whiteness, low density, and strong adhesion — particularly relevant for manufacturers running clean-room adjacent processes who cannot tolerate airborne fine powder. Full grade data is available on the foaming agents for footwear applications page.
Low-VOC, low-formamide, and low-ammonia ADC grades address regulatory compliance without switching foaming chemistry entirely. Grade FWHJ05 (decomposition temperature 190°C, gas yield 180 mL/g) targets EVA compression-molded shoe midsoles and is formulated as a direct drop-in replacement for standard ADC — no additional activator is required in the formulation. Formamide content is held below 200 ppm. Grade FWHJ201 (decomposition temperature 195°C, gas yield 180 mL/g) adds ammonia control below 200 ppm alongside formamide below 200 ppm, covering brands with dual-limit requirements on both residues. These grades are detailed on the low-VOC, low-formamide, low-ammonia ADC foaming agents page.
Automotive lightweighting foaming agents serve PP injection molding for interior structural parts, where fine, uniform cell structure and minimal surface flow marks are critical to part appearance and assembly tolerances. Grade LD22NXS (decomposition temperature 155°C, gas yield 35 mL/g) and Grade LD25NXS (decomposition temperature 150°C, gas yield 40 mL/g) are both supplied in PP open-mold format and deliver uniform and fine cell structures. LD25NXS specifically addresses minimal surface flow marks, which is a key quality requirement for visible interior automotive trim that cannot be painted or laminated post-molding. Details are on the automotive lightweighting foaming agents page.
Dust-free granular foaming agents for extrusion and injection molding sink mark prevention cover a wide range of engineering and commodity resins. These grades address two distinct process problems: weight reduction in extruded profiles and hollow sections, and sink mark prevention in injection-molded thick-wall parts where differential shrinkage creates surface depressions. Grade LD32NXS (decomposition temperature 155°C, gas yield 50 mL/g) is an eco-friendly granular grade for PE/PP extrusion. Grade LD12068SA-1 (decomposition temperature 160°C, gas yield 70 mL/g) handles both injection molding sink mark prevention in PE/PP/ABS/PPO and extrusion weight reduction. Grade PE135XS (decomposition temperature 150°C, gas yield 80 mL/g) is a cost-effective general-purpose extrusion grade with high gas yield. Grades LD53NXS and LD56NXS (both decomposing at 210°C) are designed for high-processing-temperature PP applications above 220°C, with LD56NXS also functioning as a nucleating agent in physical foaming systems. Grade PS233NXS (decomposition temperature 190°C, gas yield 20 mL/g) handles engineering plastics including ABS and PC in sink mark prevention applications. Full specifications are available on the dust-free granular foaming agents for extrusion and injection molding sink mark prevention page.
3D printing foaming agents expand the application range into additive manufacturing. Grade T-700-40S (decomposition temperature 150°C) is developed for PLA-based FDM printing and provides dimensional stability and weight reduction in printed parts, enabling lightweight lattice-like structures in functional prototypes and end-use parts. Full details are on the 3D printing foaming agents page.
Cross-linked IXPP and IXPE foaming applications use specialized grades compatible with irradiation or chemical cross-linking processes. These materials require CFA grades that perform within the tight temperature and pressure constraints of the cross-linking step without premature decomposition. The IXPP/IXPE foaming agents page covers the relevant grades.
PS-based foaming, used in extruded board products, decorative trims, and light diffusion applications, requires foaming agents matched to the narrow processing window of polystyrene and its blends. The PS foaming agents and light diffusion board foaming agents pages address these substrates. PE applications, including packaging foam sheets, pipe insulation, and geomembrane underlays, are covered separately on the PE foaming agents page.
Joysun manufactures foaming agent active ingredients from synthesis, not only formulates them. The synthesis, supply, and custom pre-dispersed masterbatch service provides seven active chemistries: ADC (azodicarbonamide, CAS 123-77-3, decomposition temperature 205°C, gas yield 220 mL/g), OBSH (4,4'-oxybis(benzenesulfonyl hydrazide), CAS 80-51-3, decomposition temperature 160°C, gas yield 140 mL/g), TSH (p-toluenesulfonyl hydrazide, CAS 1576-35-8, decomposition temperature 110°C, gas yield 130 mL/g), TSSC (p-toluenesulfonyl semicarbazide, CAS 10396-10-8, decomposition temperature 240°C, gas yield 150 mL/g), H/DPT (N,N'-dinitrosopentamethylenetetramine, CAS 101-25-7, decomposition temperature 190°C, gas yield 240 mL/g), and two activators — ZBS (zinc benzenesulfinate, CAS 24308-84-7) and ZTS (zinc p-toluenesulfinate, CAS 24345-02-6) — which promote decomposition of primary foaming agents and are used to dial in effective decomposition temperature in compound formulations.
OBSH is particularly relevant for buyers who want to move away from ADC entirely. Its decomposition products are free of ammonia and formamide, making it inherently compatible with strict consumer goods regulations. The lower gas yield compared to ADC (140 vs 220 mL/g) means loading levels need adjustment, but for applications where residue chemistry is a go/no-go criterion, OBSH eliminates the need for formamide and ammonia testing altogether.
TSH at 110°C decomposition temperature is the lowest-temperature option in the lineup, making it suitable for rubber systems processed at temperatures below standard plastics processing ranges, and for TPE or elastomer compounds where the processing temperature window is tight.
TSSC at 240°C is the highest-temperature grade, supporting engineering resins processed above 230°C such as polyamide (PA), polycarbonate (PC), and certain specialty polymer alloys where conventional ADC would decompose prematurely during compounding.
Custom particle size specification for ADC is available for buyers who need specific granulometry for their dispersion method — coarser particles for dry blending, finer particles for masterbatch production or liquid dispersion systems.
Pre-dispersed masterbatch service allows buyers to receive foaming agents pre-compounded into a carrier resin compatible with their production polymer, eliminating dust handling, improving dosing precision, and removing the need for internal masterbatch production infrastructure.
Decomposition temperature vs. processing temperature: select a CFA whose decomposition onset temperature is at least 10–20°C above the barrel processing temperature to avoid premature foaming during feeding and conveying. The effective decomposition temperature in a polymer melt differs from the value measured by differential scanning calorimetry (DSC) in air, so melt testing under relevant pressure conditions is recommended when pushing tight processing windows.
Gas yield and dosage calculation: target weight reduction percentage determines the required gas yield at the chosen dosage level. Higher gas yield grades allow lower dosage at the same weight reduction, which reduces residue loading in the final part and often improves surface aesthetics. For sink mark prevention applications, the required dosage is considerably lower than for full structural foaming — typically 0.1–0.5% by weight versus 1–3% for weight reduction targets of 10–30%.
Cell structure and nucleation: smaller and more uniform cells generally improve mechanical properties in structural foamed parts and improve surface finish. Grade selection, particle size of the CFA, cooling rate, and mold or die design all interact. For very fine cell requirements, combining a CFA with a physical nucleating agent or adjusting cooling profile may be necessary in addition to grade selection.
Residue and color effects: ADC residue includes biurea and cyanuric acid, which are relatively inert but can contribute to yellowish coloration in white or light-colored parts. For parts requiring high whiteness — such as TPU footwear in white colorways or white foam sheets — low-residue grades or OBSH-based systems are preferable. Grade TP204NS specifically lists high whiteness as a key feature for this reason.
Regulatory compliance: for children's footwear, food-contact foam, and consumer goods sold in Europe, formamide levels in the finished article are regulated. Standard ADC produces formamide as a decomposition byproduct. Compliance requires either using low-formamide ADC grades (FWHJ05, FWHJ201) or switching to OBSH-based systems where formamide and ammonia are not produced. Test finished articles rather than relying solely on raw material certificates, since processing conditions affect residue levels.
Footwear manufacturing accounts for a large share of global CFA consumption. EVA midsole compression molding, TPR outsole injection molding, and TPU one-shot direct attach all use different grades based on resin chemistry, mold temperature, and part geometry. Regulatory pressure on formamide in European markets has driven significant demand for low-formamide and formamide-free alternatives over the past several years.
Automotive plastic lightweighting uses CFA in PP and engineering plastic interior components to reduce part weight without changing wall thickness or tooling, enabling weight savings that contribute to fuel efficiency or EV range targets. Fine cell structure grades minimize the impact on surface aesthetics in Class A or near-Class A applications. Complementary to foaming, some automotive component manufacturers also use Joysun's NVH expandable sealants for cavity sealing and acoustic management in the same vehicle assembly.
Packaging and construction foam uses CFA in polyethylene and polystyrene systems for foam sheet, protective packaging, pipe insulation, and rigid board. High gas yield grades reduce material cost per unit volume, which is a significant factor at the scale these industries operate.
Engineering plastics including ABS, PC, PPO, and PA use high-temperature CFA grades to prevent sink marks in thick-walled injection-molded housings, structural brackets, and enclosures. Grade PS233NXS (ABS/PC) and LD53NXS (high-temperature PP) specifically address this requirement.
3D printing filament compounders and materials developers are increasingly incorporating CFA into FDM filament formulations to create lightweight cellular infill structures and reduce material consumption per print. Grade T-700-40S for PLA addresses this emerging segment.
For buyers sourcing a full additive package — for example, PVC-based foam advertising board requiring both a foaming agent and a thermal stabilizer — Joysun's portfolio also includes PVC Ca-Zn stabilizers and PVC flame retardants, enabling consolidated sourcing from a single supplier with technical knowledge across the formulation system.
Synthesis-level control over raw materials means Joysun can adjust particle size, purity, and activator loading in ADC and other chemistries based on buyer requirements — a level of customization that is not possible when sourcing through trading companies or from formulators who buy in bulk and repackage.
The R&D center and a Zhejiang Province postdoctoral research station collaborative platform support formulation development for non-standard applications. Buyers developing new polymer compounds or entering new application segments can request application testing and technical support rather than specifying blind.
Zhejiang Joysun Advanced Material Co., Ltd., established in 2005 and operating from the Dushangang Chemical Industrial Park in Pinghu, holds ISO 9001 quality management certification, AEO Advanced Certification from Chinese customs (2025), national High-Tech Enterprise status, and has been recognized as a Zhejiang Province Hidden Champion enterprise. The company has served over 600 clients globally across Europe, Southeast Asia, North America, and the Middle East. Annual production capacity across all product lines is 70,000 tons across two factory sites.
Full company background and capability information is available on the about us page. For technical data sheets, visit each product page. For volume inquiries, custom formulation requests, or sample orders, contact the sales team at sale@joysunsh.com or via the contact page.
