Zinc borate, an inorganic compound composed of zinc, boron, and oxygen, is one of the flame retardants offered by Taixing. We can provide different types of it, mainly based on the different water of crystallization contents. You can choose from various structural forms of zinc borate, including , , and 3.5-hydrated types, just according to your actual needs.
Actually, when discussing this issue, several points need to be determined based on the type of zinc borate, including the chemical composition content. For example, 3,5-hydrated zinc borate, this common and popular product from Taixing, contains approximately 37% zinc oxide, 48% boron trioxide, and about 15% water of crystallization. But we can also offer the anhydrous type, the proportions become approximately 77-78% zinc oxide, 22-23% boron trioxide, and no water of crystallization.
This parameter is highly correlated with the chemical composition above. Hydrated zinc borate has a LOI of 14%-16%, while anhydrous zinc borate has ≤1% because it lacks water of crystallization.
This also varies between different types of zinc borate. When we customize a formula for you, if the polymer processing temperature is in the medium to low temperature range, a hydrated type can be selected, with a dehydration range of 290-330 degrees Celsius. But if you want to use it in a high-temperature engineering plastic, we will recommend you choose the anhydrous type, with a thermal stability temperature exceeding 400 degrees Celsius.
The mainstream range for zinc borate is D50: 2-10 μm. For a finer particle size, please contact Taixing for customized formulation.
From a long-term use perspective, zinc borate is certainly a very reliable flame retardant. We recommend this type of product because of its excellent weather resistance and stability. It has extremely low solubility in water, and as an inorganic salt, unlike organic ones, it does not experience significant chain breakage or rapid performance degradation. The particle structure is stable, and it remains inert in contact with polymer systems, without adverse reactions. Furthermore, the flame-retardant effect of zinc borate does not significantly decrease over its entire service life, so you can use it with confidence.
When you wholesale a batch of zinc borate from us, you will face the issues of its transportation and storage. Taixing will arrange reliable transportation and make preparations for rain and moisture protection during transportation. When you are preparing a warehouse for it, please make sure that the environment is dry, cool and well ventilated. Although zinc borate has good stability, it is still necessary to avoid long-term exposure to high temperature and high humidity environments. In particular, the hydrated type is slightly more prone to absorbing moisture than the anhydrous type.
Once opened, use as soon as possible. Before adding, pre-disperse or pre-mix with the main flame retardant and add in batches, do not add all at once.
