Notes on duty & taxes rates and compliance
Stearate Calcium is duty free and a has a VAT rate of 21% . High probability that restrictions apply for shipping this product with courier or postal companies. Shipping prohibitions, restrictions or special packaging requirements may apply to these products due to regulations of shipping dangerous goods.
I recommend you that you send an small amount with very good packaging and test if its a problem. Sometimes by experience is better to learn by experience that what they told you.