Frequently Asked Questions

Here you can easily find frequent questions as per FAQs below. If you are not finding what you are looking for, just ask us for help. We could be reached 7/24.


General Questions

We located in Hangzhou, Zhejiang Province. The nearest airport is Xiaoshan International Airport (about 25 km), Nearest Seaport Shanghai ( 250 km) and Ningbo ( 160 km).

T/T Transfer, Letter of Credit ( LC), Paypal, Western Union, D/A, O/A, or D/P are all acceptable.

We know what customers care, so we will protect the privacy of our customers and never disclose it to the third party before you don’t agree.

We offer a 30-day, no-questions-asked return policy. If you’re not satisfied with your purchase, simply return it within 30 days.

We ship worldwide. Please provide your location details for specific shipping information.

We offer comprehensive customer support through phone, email, and live chat on our website.

Once your order is shipped, we will provide a tracking number so you can track your order’s progress.

Yes, all our products come with a warranty. The specific terms vary by product, so please check the product details or contact us for more information.

We value your feedback and are committed to improving our services. You can provide feedback or make a complaint through our website or by contacting our customer service team.


Services Info

Our vials, caps, and septa are designed to fit most autosampler models. Please provide your model details for specific compatibility information.

We offer competitive pricing without compromising on quality. Please contact us for specific product pricing.

We have strict quality control over the source of raw materials for QC and QA. Also, we are available for a third party inspection such as SGS, Intertek to ensure the quality. Our pricing is based on the investigation of the market and we are favorable to share mutual benefits.

Our high-quality products ensure reliable results, reducing the need for retests and saving time and resources.

We are delighted to inform that we are able to ODM and OBM with our Mastelf logo Brand. We are currently promoting our brand, so you’ll be getting an additional discount once distribute our products.

Yes, we can provide samples for most of our products. Please contact us to request a sample.

Yes, we do offer OEM services. We can customize our products to match your brand and specific requirements.

Delivery times vary depending on the order size and destination. We strive to fulfill orders as quickly as possible. Please contact us for specific delivery times.

mastelf faq

Emergency Questions

We offer after-sale service to our customers. Whenever complaints came in like quality issues, carton damage, or quantity shortages.
We kindly request that you inform us of the issue by email or if possible with a report attached. Upon receiving your request, we will get in touch. 
It is important to note that the complaint period expires one year after the goods have been shipped.

Ask For A Quick Quote

We will contact you within 1 working day, please pay attention to the email with the suffix “”