Monodisperse PEG is a pure compound with a precise, discrete molecular weight and exact molecular formula, whereas polydisperse PEG is a polymer mixture with an average molecular weight (e.g., 2K, 5K, 10K). Compared to polydisperse PEG, monodisperse PEG not only addresses the limitations of conventional PEG’s polydispersity but also allows fine-tuning of the physicochemical and biological properties of PEGylated drug products through precise structural control.
PEG products exhibit sensitivity to temperature, light, and moisture, requiring storage at 15°C or below immediately upon receipt. While most products are provided in solid form (with the exception of very low molecular weight variants), all vials must be protected from light exposure, particularly UV radiation. Prior to opening, frozen products should be allowed to reach room temperature to prevent moisture condensation. For optimal long-term stability, maintain products in their original solid form and avoid storage in solution.
If you cannot find your desired product structure on our platform or require a one-stop procurement solution for reagents across multiple R&D processes, please contact our team. We will evaluate the feasibility of your request and, if possible, provide a systematic solution tailored to your needs.
In-stock items can be shipped within one week. As PEG products are sensitive materials, we conduct quality testing on each batch prior to shipment to ensure optimal condition. For out of-stock items, the standard lead time is typically 3–5 weeks, depending on synthesis complexity. Should you have any specific delivery requirements, we will contact you to confirm the details.
Our products are manufactured under stringent QA/QC standards and a well-established approval and review system. Each batch undergoes rigorous quality inspection by the Quality Department before shipment, with a Certificate of Analysis (COA) issued for every product. State of-the-art analytical instruments are employed for product testing to guarantee structural integrity and purity that meet scientific research application standards.
All products are packaged according to our Certificate of Analysis (COA) to ensure stability and prevent damage during transit. Each vial is sealed with parafilm, vacuum-packed, and wrapped in protective bubble wrap. For temperature-sensitive items, we include ice packs to maintain appropriate storage conditions.
We typically ship via FedEx using 2Day, Overnight, or International Priority services, depending on product stability and destination. Other carriers, such as UPS or DHL, can be accommodated upon request.
Delivery time and cost depend on product availability and shipping destination. For in-stock items, orders placed before 3:00 PM PST are typically shipped the same day. We use FedEx 2Day, Overnight, or International Priority based on product stability and location. Shipping costs vary depending on the method and destination. For a shipping estimate, please provide the item(s) of interest and your delivery address—we’ll be happy to assist.
To check the status of your order, please contact us at orders@purepeg.com. Be sure to include your order number or purchase details in your message so we can assist you promptly.
To request an invoice, please email us at ar@purepeg.com. If possible, include your order number or relevant purchase details to help us process your request efficiently.
We accept ACH, wire transfers, checks, and major credit cards.
Our standard payment terms are NET 30, meaning payment is due within 30 days of the invoice date. If you require extended payment terms, please feel free to inquire—our team will be happy to assist.
