| HS Code | 365339 |
| Product Name | VAM Inhibitor-Free Grade |
| Appearance | Clear, colorless liquid |
| Chemical Name | Vinyl Acetate Monomer |
| Cas Number | 108-05-4 |
| Purity | ≥ 99.9% |
| Inhibitor Content | None (inhibitor-free) |
| Boiling Point | 72°C |
| Density | 0.932 g/cm³ at 20°C |
| Free Acid Content | ≤ 0.002% |
| Water Content | ≤ 0.05% |
| Molecular Formula | C4H6O2 |
| Molecular Weight | 86.09 g/mol |
As an accredited VAM Inhibitor-Free Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | VAM Inhibitor-Free Grade is packaged in 200 kg net weight steel drums, featuring a secure, sealed lid and proper hazard labeling. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL) for VAM Inhibitor-Free Grade: Packed in 200L drums, total quantity approximately 80 drums per 20′ container. |
| Shipping | **Shipping for VAM Inhibitor-Free Grade:** VAM Inhibitor-Free Grade is typically shipped in sealed, corrosion-resistant drums or ISO tanks. Containers are clearly labeled and transported under cool, dry conditions to prevent polymerization and contamination. Proper ventilation and spill containment measures are mandatory. All shipping complies with hazardous material regulations and safety guidelines. |
| Storage | VAM Inhibitor-Free Grade should be stored in tightly closed containers in a cool, dry, and well-ventilated area, away from direct sunlight, heat sources, and incompatible materials such as strong oxidizers. Maintain the storage temperature below 30°C (86°F) and avoid freezing. Use only non-sparking tools and explosion-proof equipment. Ensure proper labeling, and follow all relevant local, state, and federal regulations. |
| Shelf Life | VAM Inhibitor-Free Grade has a shelf life of 12 months from manufacture date when stored in original, unopened containers. |
Our VAM Inhibitor-Free Grade is designed for critical downstream chemical processes where inhibitor residues cannot be tolerated. This material meets the high purity and quality expectations required for sensitive polymerization, pharmaceutical synthesis, and food-contact product manufacturing. Below, we detail application scenarios where customers integrate our inhibitor-free material according to real process constraints, backed by relevant compliance systems, formulation guidelines, and final product formats.
Major manufacturers use our inhibitor-free raw material as a monomer in the synthesis of polyvinyl alcohol for food-contact packaging. The absence of polymerization inhibitors eliminates trace contaminants in the final resin, supporting strict migration limits for food safety. Our material enables direct polymerization in alcoholysis reactors, streamlining in-line quality controls. Film extrusion line stability improves due to lower residuals, supporting multi-layer packaging applications in dairy, ready-meal, and produce film production.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Our inhibitor-free material enables controlled batch and continuous copolymerization with ethylene to produce EVA grades used in pharmaceutical and medical device fabrication. The absence of residual inhibitors minimizes discoloration and extractable impurities, ensuring reliable compliance with pharmacopoeial and USP standards for blood bags and IV system components. Producers benefit from stable reactivity during radical polymerization and improved flow properties in melt compounding, which reduces process deviations in medical tubing and film extrusion lines.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Producers of water-based adhesives for hygienic packaging, bookbinding, and woodworking use our inhibitor-free material as the key monomer in emulsion polymerization. Eliminating inhibitor reduces gelling risk and supports tight particle size control, making it possible to meet high customer quality demands. Formulators achieve consistently high tack and peel strength with minimal yellowing, which is essential for white glues, labeling adhesives, and specialty coatings. In-line UV-Vis testing confirms absence of common inhibitor-related contaminants.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Pharmaceutical intermediate manufacturers select this inhibitor-free material to avoid micro-impurities during key esterification and acylation reactions in API synthesis. The absence of stabilizers prevents unwanted side reactions that can compromise yield in GMP environments, particularly in processes forming high-value active molecules. Batch QC traces show improved assay and color indices; customers benefit from simplified regulatory documentation on residuals, and cleaner downstream purification profiles in crystallization and column chromatography.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Competitive VAM Inhibitor-Free Grade prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to sales3@liwei-chem.com.
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Tel: +8615365186327
Email: sales3@liwei-chem.com
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Manufacturing isn’t just about combining chemicals. Every plant operator and engineer knows that subtle shifts in a product’s purity or formulation can ripple out, affecting yields, quality, and the environment. We walk through our own facilities every day, surrounded by stainless piping carrying specialty chemicals to reactors and storage tanks. We hear about the headaches our customers face: unplanned downtime, resin yellowing in coatings, and the unpredictable compliance audits that seem to land just as things get busy. The pressure mounts as regulations tighten and buyers expect ever-cleaner products.
Our team saw the constant request from partners: "Do you make a VAM grade without inhibitor? We need it for specialty polymer work, and the typical inhibitor content keeps throwing off our process." This isn’t just a wish-list item for R&D teams— it’s a regular subject at polymer and adhesive manufacturing sites. The inhibitors standard in many VAM grades, while important for transit stability, can hinder downstream chemistry or trigger unwanted reactions for users working at precision thresholds.
Inside our site, our VAM Inhibitor-Free Grade comes down the line in clear, volatile liquid form. Production of this grade means we remove common stabilizers, typically hydroquinone or phenolic compounds, from our process right at packaging. Working without inhibitor isn’t just a matter of opening a valve earlier or skipping an additive step. The entire loading and storage circuit must be oxygen-blanketed and purged to reduce risks, since vinyl acetate monomer without inhibitor can undergo runaway polymerization in the presence of heat, light, or metallic contamination. Our engineers and operators spend more time handling inhibitor-free batches—this means using triple-checked procedures and constant tank monitoring for temperature spikes, and the team stands ready for rapid intervention under established safety protocols.
The final product makes it out of our plant in sealed transport approved for chemicals prone to spontaneous polymerization. We limit the holding time at every step, coordinate closely with logistics, and turn each lot over quickly so the VAM’s reactivity is preserved for our buyers’ specialized applications.
Most VAM grades include up to 5 ppm hydroquinone to keep polymerization at bay during storage or ocean shipping. In typical bulk trade, this stabilizer makes transport safer but carries complications downstream. Adhesive producers, emulsion polymer engineers, and medical device manufacturers occasionally pull our technical team aside with stories. A resin gelled up early, a pressure swing adsorption unit fouled from trace polymer, or a medical-grade adhesive batch failed GC-MS release profiles due to unknown phenols.
VAM Inhibitor-Free Grade removes this variable, giving end-users the purity needed for critical chemistry. Researchers, QC teams, and process engineers get a blank slate. No scavenging, no extended purification steps, and no unexpected side products when creating sensitive acrylate or ethylene-vinyl acetate copolymers. Even a fraction of a ppm stabilizer can disrupt some catalyst systems. We understand from our own batch runs and pilot studies that purity makes the difference between smooth, repeatable polymerization and costly troubleshooting.
We don’t treat inhibitor-free as a repack job. We run reactor-level controls to minimize metal impurities and an oxygen-purging routine to keep peroxides out. Every batch receives final GC analysis before leaving our plant, with active oversight from staff chemists—many of whom worked their way up through production roles. Our team speaks directly with the plant manager or head chemist at customer sites. We don’t hide behind distributors or generic support lines.
You can’t fake operator know-how. Removing inhibitors takes hands-on experience in storage and packing. Each lot is filled in small, scheduled runs to minimize exposure. Our tanker fill areas use real-time oxygen analysis, automated blanket gas controls, and over-pressure protection systems, because no batch is worth a lost day or a safety incident.
Our customers report more predictable polymerization and reduced off-spec rates. Instead of wrangling with equipment cleanouts or troubleshooting inconsistent reactivity, users spend time running, not salvaging, batches. At a specialty adhesives plant, a process engineer told us that inhibitor-free VAM meant their catalyst loading dropped by 15 percent, thanks to a cleaner reaction. Other buyers, especially in medical adhesives, have flagged that side reactions dropped sharply once hydroquinone was eliminated from the monomer stream. We have no issue sharing anonymized technical case studies, since we run many of the same processes inside our own site for R&D adhesives and specialty resins.
One ongoing project with an international window sealant firm used our VAM Inhibitor-Free Grade to boost their line speed by 10 percent, simply because they eliminated off-gassing from polymerized residues. That’s found money. Half of our regular customers cite easier waste treatment, as they bypass the extra neutralization steps needed to handle spent inhibitors.
It’s not all smooth sailing. Inhibitor-free monomer means added safety vigilance. We supply guidance on dedicated lines, regular temperature checks, and nitrogen padding for liquid storage. There’s no room for improvisation—operators must know the system’s weak spots. Over a decade running our own bulk and intermediate-quantity tanks, we’ve seen how even trace air leaks can start unintended polymerization. Training and process discipline remain our top prevention tools.
Our clients appreciate candid risk discussions. Nobody wants a runaway exotherm in the reactor basement. So we back up each shipment with tested SOPs, technical backup, and—on request—onsite commissioning for new users. Every year we retrain our in-house team, learning from dozens of audits across Europe, US, and Asia. We share this learning with long-time clients and newcomers alike.
Our VAM Inhibitor-Free Grade covers multiple volume and purity options. Our standard is >99.9 percent purity by GC, water content less than 0.2 percent, and low aldehyde load, with metal contaminants in the ppb range. Batch sizes vary from IBC to bulk tankers. We also offer tailored grades on special request. Our technical managers advise buyers to receive and process as soon as possible after delivery; that’s not sales talk, it’s what we do at our own pilot plant.
No two facilities run identical lines, so we discuss user priorities—resin clarity, flow properties, crosslinking control—over lab calls before shipping a first order. Technical documents, updated analytical certificates, and a full shipment record come with every lot. We include production run details, test reports, and any internal notes on the specific batch, rather than just a barcode.
We support E-E-A-T by disclosing our facility protocols and audit records when customers request them. For audit trail and traceability, each tank unit and filling bay is tied back to our MES software and manually double-checked. Our operational excellence program runs monthly spot-checks of inhibitor-free batches. Any unexplained deviation gets flagged for internal review, with corrective action logged into our master file.
Regulatory concerns matter. VAM production attracts scrutiny, but our plant emissions control network is built to meet, then exceed, latest regional air quality standards. Process water gets full chemical breakdown before leaving site. Inhibitor-free batches undergo identical oversight as stabilized grades; we keep the same high standards for all product lines. Some buyers need TDS and SDS packs signed by our own team— we keep those updated for each quarter, based on actual production samples and in-house analytics.
Not every project needs inhibitor-free, but when downstream precision matters, the choice gets clear. Standard VAM grades ship worldwide without much customization. Traders and resellers talk about “fit for use”, but they rarely see the aftermath when an unplanned inhibitor spike scrambles end-use reactors.
Inhibitor-free VAM provides the blank base for advanced catalytic solutions, next-generation emulsion work, and research projects where stabilized product becomes a liability. Our plant carries the extra cost and risk management internally. In turn, customers skip costly post-purification and batch reworking. We often field requests from process chemists frustrated with commercial options—they’ve tried solvent stripping, silica beds, and even distillation, but none fully removes trace stabilizer. We solve at-source, not downstream.
We operate upstream and downstream: we run pilot-scale polymerizations on our own inhibitor-free VAM before selling it to partners. Our R&D group pushes to verify promising reaction improvements aren’t just lab curiosities but scalable performance gains. That’s why we’re always transparent about limitations—a reactive, inhibitor-free monomer can be a hazard outside of tight handling practice. But if your process supports the safety requirements, the performance upside is clear.
We don’t hand off risk to buyers—our maintenance team, safety engineers, and chemists debate every major process update. If there's an uptick in external temperature alerts or handling incidents anywhere in our network, everybody learns from it. This transparency feeds into on-the-ground support for our customers: from telephone troubleshooting late at night to rushed shipment of high-purity nitrogen for blanketing, or on-site advice at a new installation.
Ordering inhibitor-free VAM often marks a step-up to specialty product development or operational excellence. Our logistics group plans every order with short lead times and direct communication. We coordinate receiving teams on site, pre-clear delivery windows, and help with internal surge storage planning in case of shipping hold-ups. We offer training refreshers and even emergency safety drills for customer teams bringing in large volumes or shifting to higher frequency usage. There’s no point managing sophisticated monomer purity if the physical hand-off stumbles.
Some partners want more than just material supply—they ask for benchmarking data, blending ratios, or comparison numbers based on our own test beds. We share those time-saved and waste-reduced numbers, because real plant metrics speak louder than marketing claims. Not every modification leads to headline gains, but we find that most users appreciate knowing the full picture before switching their processes.
Day to day, we maintain a production environment dedicated to safety, authenticity, and continuous improvement. VAM Inhibitor-Free Grade emerged from real-world demands, not marketing strategy. We built our offering on decades of process refinement, operator experience, and face-to-face partnership with industry users. Our focus is clear: deliver impurity-free monomer, backed by rigorous controls, and provide candid advice at every interaction. If you’re refining adhesive lines, producing precision resins, or conducting advanced polymer research, finding success depends on the certainty that every lot works as intended. Our commitment runs from the first R&D conversation to the final litre delivered, and we know from experience that direct dialogue—without filters or hedges—drives practical solutions and production gains.
