When I discuss “yellow blowing agent” with industrial buyers, I usually explain that the term commonly refers to azodicarbonamide, also known as ADC or ADCA. ADC is an organic chemical blowing agent supplied as a fine yellow to yellow-orange powder, with the molecular formula C2H4N4O2 and a molecular weight of approximately 116.08 g/mol. It decomposes when heated and releases gas, allowing plastics, rubber, and related compounds to form a cellular structure.
However, color alone is not a sufficient chemical identification. Different manufacturers may describe products as yellow blowing agents, while their active chemistry, activation temperature, particle size, gas yield, and additive system differ. For reliable purchasing, I recommend confirming the product name, CAS number, safety data sheet, certificate of analysis, and intended polymer application before placing an order.
In most B2B polymer applications, yellow blowing agent means ADC-based chemical blowing agent. The commonly referenced CAS number for azodicarbonamide is 123-77-3. When heated under suitable processing conditions, the material decomposes and generates gases, primarily nitrogen, carbon monoxide, carbon dioxide, and smaller quantities of other decomposition products depending on the formulation and process environment.
The generated gas expands the softened polymer or rubber compound. At the same time, the surrounding material must have sufficient melt strength or viscosity to retain the gas and create a stable cell structure. This is why the blowing agent cannot be selected independently from the resin, compound formulation, processing temperature, mold design, and required density.
The yellow appearance is generally a visual characteristic of the powder and does not, by itself, prove purity or performance. Shade can vary with raw material quality, particle size, manufacturing conditions, surface treatment, and storage. I therefore advise buyers to use color as an initial identification feature only, not as the main acceptance criterion.
The primary function is chemical foaming. During heating, ADC releases gas that creates cells inside a polymer or rubber matrix, reducing density and producing a foam or sponge-like structure. This can support weight reduction, cushioning, thermal insulation, sound absorption, and controlled surface texture, depending on the material system.
ADC is also valued because its decomposition profile can be adjusted through activators or modified grades. A conventional grade may decompose at a temperature around 200–210°C, while activated or surface-treated grades may be designed for lower processing temperatures. The actual onset and peak decomposition temperatures must be verified against the supplier’s technical data because they vary by grade and test method.
A commercial yellow blowing agent can influence more than expansion. Its particle distribution, dispersion, gas release rate, and residue content may affect cell size, surface smoothness, odor, color, compression behavior, and production stability. For this reason, I treat blowing agent selection as a formulation decision rather than a simple commodity purchase.
ADC is used in selected thermoplastic formulations, including PVC, EVA, polyethylene, and other polymer systems where the processing temperature and melt behavior are compatible. It may be used for profiles, sheets, footwear materials, seals, mats, synthetic leather, and molded components. The correct grade depends on whether the buyer needs low-density expansion, fine cells, a smooth surface, or a specific processing window.
Rubber manufacturers may use yellow blowing agent to produce sponge rubber, sealing strips, gaskets, soles, hoses, and cushioning components. In these systems, decomposition timing must be coordinated with vulcanization. If gas is released too early, the compound may lose expansion efficiency; if it is released too late, the cells may not develop properly before the rubber structure sets.
Foamed polymer and rubber products can provide lower weight and improved cushioning compared with solid materials. Applications may include automotive sealing materials, construction profiles, packaging components, sports goods, footwear, and general industrial insulation. The final suitability depends on the product’s mechanical, thermal, odor, emissions, and regulatory requirements.
For more information, please visit Shitong.
Not every yellow blowing agent is supplied in exactly the same form. Buyers may encounter conventional ADC, activated ADC, surface-treated ADC, fine-particle grades, and masterbatch or pre-dispersed forms. These options are intended to address different needs, such as lower activation temperature, improved dispersion, reduced dust, or easier dosing.
| Product consideration | What it affects | Buyer question |
|---|---|---|
| Particle size | Dispersion, surface quality, and dosing consistency | Is the grade suitable for my compound and mixing equipment? |
| Activation temperature | Compatibility with extrusion, molding, or vulcanization | Does decomposition match my processing window? |
| Gas yield | Expansion efficiency and achievable density reduction | What is the tested gas evolution under the stated method? |
| Surface treatment or activation | Dispersion, processing temperature, and formulation behavior | What additives are included, and are they compatible with my resin? |
Before approving a yellow blowing agent, I recommend requesting a technical data sheet and a recent certificate of analysis. Important specifications normally include appearance, active content, moisture, ash or residue, particle size, decomposition characteristics, gas evolution, and storage requirements. A buyer should also confirm whether the stated values are typical or guaranteed release specifications.
For reference, the chemical identity of ADC is commonly represented by a molecular weight of approximately 116.08 g/mol, and many conventional grades are associated with a decomposition range near 200–210°C. Some commercial materials report gas evolution in the approximate range of 200–230 mL/g under defined test conditions, but this figure is method-dependent and should not be used for direct comparison unless all suppliers use the same test method.
Packaging and storage are also practical specifications. Buyers should verify the standard package size, lot number, production date, recommended storage temperature, humidity protection, and shelf-life guidance. Because powder handling can affect worker exposure and dispersion, the SDS and local occupational safety requirements should be reviewed before production use.
First, compare the blowing agent’s decomposition profile with the actual temperature history of the compound. The relevant temperature is not only the machine set point; residence time, shear, pressure, mold temperature, and the presence of activators also influence when gas is released. I suggest validating the grade through a small laboratory or pilot trial before full-scale purchasing.
A high gas yield does not automatically produce the best foam. The polymer must be able to hold the gas, and the release rate must be compatible with nucleation and solidification. For fine-cell products, dispersion and particle size may be as important as nominal gas volume.
For footwear, automotive, construction, packaging, and consumer products, the buyer may have additional requirements related to odor, emissions, restricted substances, worker handling, or finished-product regulations. I recommend defining these requirements before comparing prices. A technically suitable grade that cannot pass the customer’s compliance review may create greater cost later in the project.
At Shitong, I approach yellow blowing agent supply as a technical purchasing process. I can help buyers clarify whether they need a conventional ADC grade, an activated grade, a finer-particle option, or another formulation based on the polymer, equipment, target density, and processing temperature. Product selection should be based on documented specifications rather than color or a general product name.
For an initial evaluation, I recommend sharing the polymer or rubber type, processing method, operating temperature, target expansion level, expected monthly volume, packaging preference, and destination market. With this information, a supplier can recommend a more relevant grade and identify which specifications require confirmation by sample testing or batch documentation.
Yellow blowing agent most commonly refers to ADC, a chemical blowing agent used to generate gas and cellular structure in compatible plastic and rubber compounds. Its key purchasing factors include chemical identity, activation temperature, gas evolution, particle size, dispersion, residue, compliance documentation, and supply consistency. The yellow color is only a preliminary visual feature and should never replace technical verification.
If I were preparing a purchase specification, I would begin with the polymer system and processing window, then define the required foam density, cell structure, surface quality, and compliance conditions. I would compare supplier documents on a like-for-like basis and test a representative sample before confirming a larger order. Buyers can contact Shitong with their formulation and production requirements to discuss suitable yellow blowing agent options, packaging, documentation, and B2B supply support.
Want more information on yellow blowing agent? Feel free to contact us.
Comments
Please Join Us to post.
0