If you’ve ever stocked silicone emulsion for manufacturing, coatings, or personal care formulations, you know that one small misstep in storage can turn a valuable batch into something unusable—no amount of mixing or filtering will bring back its original consistency or performance. As a silicone emulsion supplier with over 12 years in the industry, I’ve seen it all: batches ruined by extreme temperatures, improper container choices, or just neglecting simple storage protocols. Today, I’m breaking down exactly how to store silicone emulsion properly, based on real customer experiences and hands-on testing in our own warehouse. Let’s start with the basics, because this isn’t just about “putting it on a shelf”—it’s about protecting a product that’s a mix of silicone polymers, water, emulsifiers, and other additives, each of which has unique sensitivities. Silicone Emulsion
First, let’s talk temperature, because this is the most common mistake I see. Silicone emulsion is a water-based product, right? So extremes in heat or cold will mess with the emulsion’s stability over time. Too much heat, and the water evaporates, leaving behind a thick, lumpy residue that’s impossible to re-disperse—we once had a regular customer who left a pallet of 55-gallon drums in a loading bay during a heatwave, and by the time we tested a sample, the silicone had agglomerated into solid chunks. Too much cold, on the other hand, freezes the water phase, which breaks the emulsion’s chemical balance. We advise customers to keep storage temperatures between 5°C (41°F) and 35°C (95°F) for short-term storage (up to 3 months), and between 10°C (50°F) and 25°C (77°F) for long-term storage (over 3 months). That window avoids both evaporation and freezing, and it’s easy to implement even in basic warehouse spaces. Pro tip: If you’re in a climate with seasonal temperature swings, avoid storing near exterior walls, windows, or heating vents. We also recommend checking your warehouse thermostats monthly—small fluctuations, like a heater turning on for a few hours overnight, won’t hurt, but consistent spikes or drops will.
Next, container and packaging choices. This is another area where customers cut corners and end up with problems. Silicone is chemically inert to most materials, but that doesn’t mean any container works. Never store silicone emulsion in containers made of galvanized steel or uncoated carbon steel—over time, the emulsifiers in the emulsion will react with the metal, leading to discoloration, pH shifts, and reduced emulsion stability. We always recommend food-grade high-density polyethylene (HDPE) drums, tanks, or bulk containers for short-term use, and stainless steel (316-grade, not 304) for long-term bulk storage. Why 316? It’s more resistant to corrosion from the emulsifiers and trace metals that might be present in smaller batches. Also, always use containers with tight, airtight lids. Exposed emulsion on the surface will evaporate quickly, creating a thick skin that falls into the rest of the product, causing agglomeration. I’ve had customers use loose-fitting lids because they “need to access the emulsion frequently,” but even daily access can let in too much air and dust. For drums, invest in bung adapters that let you dispense product without fully removing the lid, and for bulk tanks, use pressure-sensitive lids that seal automatically after dispensing. One more thing: Don’t mix old and new emulsion in the same container. Even if it’s the same product, different batches might have tiny variations in pH or emulsifier content that can cause instability over time. We teach this to every new customer, and it’s prevented at least half the stability issues we’ve encountered.
Then there’s pH and chemical exposure. Silicone emulsion’s pH is carefully formulated—most of our standard products have a pH between 6 and 8, which is balanced to keep the emulsion stable. If you expose it to strong acids (below pH 4) or strong bases (above pH 10), you’ll break the emulsion’s surface tension, leading to silicone separation. The most common chemical exposure mistake isn’t intentional, though—it’s storing silicone emulsion near other industrial chemicals, like acids, alkalis, or even other latex emulsions. Fumes from adjacent chemicals can seep into the emulsion’s container and alter its pH, even if the container is sealed. We recommend storing silicone emulsion in a separate section of your warehouse, at least 3 meters (10 feet) away from other chemical products, especially acidic or alkaline ones. Also, test the pH of any emulsion you’re storing every 2 weeks, especially if you’re in a space with other chemicals. A simple pen-style pH meter costs less than $50, and it can catch a pH shift before it causes permanent damage. For example, a customer once stored silicone emulsion next to a batch of hydrochloric acid; over a month, fumes from the acid lowered the emulsion’s pH to 3, and when they went to use it, half the batch had separated into a silicone layer on top of water. That’s a $2,000 loss just because of a poor storage layout.
Light and UV exposure—yes, that matters, too. A lot of people don’t think about light affecting emulsion, but ultraviolet (UV) light can break down some of the organic emulsifiers and additives in silicone emulsion over time. This is especially true for products used in outdoor coatings, which might have UV-stabilizers, but even standard industrial emulsions are sensitive to prolonged sunlight. Avoid storing emulsion in clear plastic drums or near windows that get direct sunlight. If you must use clear containers (for small sample sizes, for example), keep them in a dark cabinet or cover them with a tarp. We learned this the hard way a few years ago when a customer ordered 10 small 5-gallon clear drums for a temporary job; they stored them on a loading dock for two weeks, and the emulsion’s viscosity dropped by 40% because UV light broke down the emulsifiers. That job was delayed, and they had to reorder a new batch—we still give them a discount when they come back because we feel bad about the miscommunication on storage.
Now, let’s talk about different storage durations, because storage changes depending on how long you’re holding the emulsion. Short-term storage (0 to 3 months) is the easiest: follow the temperature window, use sealed HDPE containers, and keep it away from other chemicals. The key here is to use the FIFO method—First In, First Out. Always use the oldest batch first, and don’t let new batches sit on top of old ones. Long-term storage (3 to 12 months) requires a bit more care. For long-term storage, we recommend using stainless steel tanks, not drums, because drums can develop small leaks over time, even if they look intact. You should also add a small amount of a non-ionic preservative (we recommend our food-grade option, which is compatible with all our emulsions) if you’re storing for more than 6 months, to prevent microbial growth in the water phase. Microbes love warm, moist environments, and they can break down the emulsifiers, leading to separation. We do not recommend storing emulsion for more than 12 months, no matter how careful you are—even with perfect conditions, the emulsion’s stability will start to degrade after a year, so it’s better to order smaller batches more frequently if you don’t go through a lot of product.
I also get a lot of questions about re-stabilizing emulsion that has gone bad, and I should be clear here: most of the time, it’s not possible. If your emulsion has separated, has a skin on top, smells foul (that’s microbial growth), or has a lumpy texture, it’s usually beyond saving. The only exception is if it’s just slightly thickened from minor evaporation—you can add a small amount of deionized water (5% to 10% of the total volume) and mix it with a high-shear mixer for 10 minutes, but that’s a temporary fix, not a long-term solution. We don’t recommend doing this for critical applications, like food contact or medical coatings, because you’re altering the product’s original formulation.
Now, let’s talk about common mistakes that even experienced customers make. One big one is storing emulsion in unconditioned spaces, like warehouses with no climate control. I know not every business can afford heated warehouses, but even if you use portable heaters in the winter or fans in the summer, you can maintain a better temperature range. Another mistake is not checking containers for leaks. Even a small pinhole leak in a drum will let water evaporate over time, and if the temperature drops below freezing, the leaked water will expand and damage the drum, ruining the entire batch. We always tell customers to do a visual check of their drums or tanks once a week, looking for dents, leaks, or discoloration. A few small dents on the side of a drum aren’t a big deal, but dents around the bung (lid) can cause the seal to break, leading to evaporation.
Another thing to consider is how you’re moving emulsion into storage. When you transfer emulsion from our bulk delivery trucks to your storage containers, use clean equipment. If you use hoses or pumps that were used for other chemicals, the residue can contaminate the silicone emulsion, leading to stability issues. We provide free hoses and pumps for bulk orders, and we tell customers to only use those tools for silicone emulsion, or to clean them thoroughly with deionized water before each use. One customer once used a hose that had leftover latex emulsion, and the two products reacted, turning the silicone emulsion into a thick, rubbery mass—they ended up throwing away $5,000 worth of product because they skipped the cleaning step.
At the end of the day, storing silicone emulsion correctly is all about attention to the small details. It’s not rocket science, but it requires consistency. We’ve been in this business long enough to know that a well-stored batch will perform exactly as intended, while a poorly stored one will cause delays, extra costs, and frustration. If you’re new to storing silicone emulsion, or if you’ve had issues with batch stability in the past, don’t hesitate to reach out to our team—we’re here to help you adjust your storage process to fit your specific needs. Whether you’re a small manufacturer with a 50-gallon drum setup or a large factory with a 10,000-gallon bulk tank, we can provide tailored advice, from container recommendations to storage layout tips. We work with clients across industries, from textile coatings to personal care, and we know that every application has unique storage requirements. If you’re ready to source high-quality silicone emulsion and get a custom storage plan for your operation, get in touch with our purchasing team today. We’ll walk you through every step, answer all your questions, and make sure your product arrives and stays in perfect condition.
Pretreatment Auxiliaries References:
- ASTM International. (2019). Standard Guide for Storage of Water-Based Polymer Emulsions. ASTM D4727-19.
- Silicone Emulsion Manufacturing Association. (2021). Best Practices for Storage and Handling of Silicone Emulsions.
- Zhang, Y., & Li, M. (2020). Stability of Water-Based Silicone Emulsions Under Variable Temperature Conditions. Journal of Applied Polymer Science, 137(24), 48762.
- Food and Drug Administration. (2022). Guidelines for Storage of Food Contact Additives, Including Silicone Emulsions.
Nanfeng Dasun Technology Co., Ltd.
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Address: Nanfeng Industrial Park, Nanfeng County, Fuzhou City, Jiangxi Province, China
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