Sep. 22, 2026
AC blowing agent usually refers to azodicarbonamide (ADC), a chemical blowing agent used to create fine, uniform cells in polymer and rubber products. When heated under suitable processing conditions, ADC decomposes and releases gas, which expands a softened polymer compound into a foam. I use the term “AC blowing agent” in this article to mean ADC-based foaming material, while recognizing that commercial grades can differ in particle size, activation temperature, gas yield, purity, and surface treatment.
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Manufacturers commonly use AC blowing agent in PVC, EVA, PE, PP, rubber, synthetic leather, footwear materials, wire and cable compounds, sealing products, and other lightweight polymer applications. The correct grade depends on the resin, processing temperature, desired foam density, color requirements, equipment, and regulatory expectations. As Shitong, I help buyers evaluate these variables before selecting a grade rather than treating all AC blowing agents as interchangeable.
AC blowing agent is incorporated into a polymer formulation before or during processing. As the compound reaches the activation range, the blowing agent decomposes and releases gas inside the softened material. The polymer melt or rubber compound must have enough strength and viscosity to retain that gas; otherwise, cells can collapse, merge, or escape from the product.
Commercial ADC products may be supplied as powders, activated grades, coated grades, or masterbatch forms. Some grades are designed to decompose at a lower temperature, while others are selected for processing systems that require delayed gas release. These differences affect extrusion stability, molding behavior, surface quality, foam uniformity, and the final density of the product.
As a practical reference, many technical discussions describe ADC decomposition in a broad range around 180–220°C, but the actual behavior of a commercial product must be confirmed through its technical data sheet and application testing. Gas yield may be reported around 200–250 mL/g for some grades, although this is not a universal specification. Buyers should compare values only when the testing method, sample condition, and reporting basis are consistent.
The primary function of AC blowing agent is to generate gas that forms cells within a polymer or rubber matrix. These cells can reduce material density and may improve cushioning, flexibility, thermal insulation, or material usage efficiency. The final result depends not only on the blowing agent but also on resin melt strength, nucleation, cooling rate, pressure, and formulation design.
A suitable ADC grade can help manufacturers develop a more consistent internal cell structure. Uniform dispersion is important because agglomerated particles may produce oversized cells, surface defects, pinholes, or uneven density. In appearance-critical products, the supplier should discuss residue, particle size, color, and compatibility instead of focusing only on gas yield.
Different activation profiles allow formulators to match gas release with the softening and shaping behavior of the polymer. If the blowing agent releases gas too early, expansion may occur before the compound has adequate strength. If it activates too late, the material may not expand sufficiently before cooling or leaving the processing zone.
| Application | Why AC Blowing Agent May Be Considered | Important Evaluation Point |
|---|---|---|
| PVC foam products | Supports lightweight structures and controlled expansion | Activation temperature, color, and residue |
| EVA footwear and foam sheets | Can contribute to cushioning and reduced density | Cell uniformity, rebound requirements, and mold cycle |
| Rubber products | Creates cellular rubber for seals, pads, and related components | Compatibility, curing system, and dimensional stability |
| PE and PP compounds | May be used for lightweight molded or extruded materials | Processing temperature and melt strength |
| Synthetic leather and coated materials | Can help develop a soft or embossed cellular structure | Surface quality, odor control, and dispersion |
AC blowing agent is also used in selected wire and cable, insulation, gasket, mat, packaging, and construction-related polymer applications. Suitability must be verified for each formulation because the same product may behave differently in an extrusion line, compression mold, injection mold, or continuous coating process. A small laboratory trial is often more informative than relying on a general application label.
The first processing question is whether the blowing agent activates within the usable temperature window of the resin. The polymer must soften sufficiently to contain the released gas, while the blowing agent must not react or decompose prematurely during compounding. I recommend comparing the supplier’s activation information with the actual barrel, die, mold, and curing temperatures used in production.
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Uneven feeding can create local over-expansion and inconsistent density. Powder handling, premixing sequence, carrier selection, and feeding equipment all influence dispersion. In continuous processing, the formulator should also check whether the grade bridges, segregates, or produces dust under the plant’s operating conditions.
There is no universal dosage that guarantees a specific density or cell size. A higher addition level may increase expansion potential, but it can also affect mechanical strength, surface appearance, dimensional stability, and processing pressure. For this reason, dosage should be established through a controlled trial, such as testing several formulation levels while recording density, cell structure, shrinkage, and surface quality.
For example, a trial may compare 1%, 2%, and 3% addition levels by weight, but these figures should be treated only as experimental points rather than standard recommendations. The final dosage depends on the resin, product thickness, desired expansion ratio, equipment, and the blowing agent’s gas yield. Buyers should ask for application guidance that reflects their actual polymer system.
Temperature is only one part of the foaming process. Pressure affects gas solubility and cell growth, while cooling determines whether the expanded structure remains stable. Excessive shear, an unsuitable die design, or inadequate cooling can produce density variation even when the blowing agent itself is appropriate.
When I evaluate an AC blowing agent for a B2B customer, I begin with the end product and process rather than the product name alone. The buyer should define the polymer type, processing method, target density, color, foam structure, product thickness, and expected production volume. These details help narrow the selection between standard, activated, coated, high-gas-yield, low-temperature, or masterbatch options.
Price per kilogram should not be the only purchasing criterion. A lower-priced grade may require higher dosage, create more scrap, or demand additional processing adjustments. A more suitable grade can sometimes reduce total production risk, but this conclusion should be supported by comparative trials and actual cost calculations.
At Shitong, we support industrial buyers who need AC blowing agent for polymer and rubber processing. Our role is to help match product characteristics with the customer’s material system, equipment, performance target, and sourcing plan. We can discuss grade selection, technical documentation, packaging, sample evaluation, and repeat-order requirements without assuming that one grade fits every application.
For a useful technical review, buyers should prepare the resin type, processing temperature, product dimensions, target density, current blowing agent, dosage, and main production problem. If the issue is poor dispersion, unstable density, surface defects, odor, premature decomposition, or insufficient expansion, these details help guide a more relevant recommendation. Final approval should always be based on the buyer’s own formulation and production trial.
AC blowing agent is a practical chemical foaming solution for manufacturers that need controlled expansion, lower density, or cellular structure in polymer and rubber products. The best grade is not determined by the name “AC” alone; it is determined by how its activation profile and dispersion behavior match the resin, equipment, and product requirements. Processing conditions must be validated because temperature, pressure, shear, and cooling can significantly change the final foam structure.
As the next step, prepare your material type, process temperature, target density, current dosage, and product application before requesting a grade recommendation. Contact Shitong to discuss your technical requirements, documentation needs, packaging expectations, and trial plan. We can help you compare suitable AC blowing agent options and move from initial selection to a more controlled production evaluation.
Contact us to discuss your requirements of ac blowing agent. Our experienced sales team can help you identify the options that best suit your needs.
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