r290 suppliers-r407h refrigerant is a good example of efficient production of Hangzhou E cool refrigeration Co.,Ltd. We select superior raw materials in a short time which only come from qualified and certified suppliers. Meanwhile, we strictly and quickly conduct testing in every phase without compromising the quality, ensuring that the product will meet the exact requirements.. In order to build confidence with the customers on our brand - Arkool, we have made your business transparent. We welcome customers' visits to inspect our certification, our facility, our production process, and others. We always actively show up in many exhibitions to detail our product and production process to customers face to face. In our social media platform, we also post abundant information about our products. Customers are given multiple channels to learn about our brand.. We have created an easily accessible way for customers to give feedback through Arkool Refrigeration. We have our service team standing by for 24 hours, creating a channel for customers to give feedback and making it easier for us to learn what needs improvement. We make sure our customer service team is skilled and engaged to provide the best services..