Purchasing Guide
Purchasing Suggestions for Overseas Buyers
Use these guides to compare product grades, brands, packaging, documents and quotation information before sending an inquiry.
Guide List
Purchasing Guide Articles
Select a topic below to review common purchasing questions for glycerin, propylene glycol and animal vaccine adjuvants.
2026-07-10How to Evaluate Propylene Glycol Quality for Food, Pharmaceutical and Specialty ApplicationsIn the pharmaceutical, food, and functional material industries, propylene glycol is widely used as a solvent, carrier, or excipient. At first glance, propylene glycol is a relatively simple and well-established basic chemical raw material. However, in practical applications, downstream users often pay much more attention to its long-term quality stability rather than a single set […]2026-07-10Imported Glycerin Selection Guide: THAIKING vs KLK Latest 2026 COA ComparisonImported glycerin is widely used in food, cosmetics, pharmaceutical, and industrial applications. Among the popular imported glycerin brands in the market, THAIKING glycerin from Thailand and KLK glycerin from Malaysia are two commonly selected options. Henan Tongshang has conducted a detailed comparison based on the latest original manufacturer COA (Certificate of Analysis) documents from 2026, […]2026-07-10Dow vs SK vs Shell Propylene Glycol: 2025–2026 COA ComparisonA Detailed Comparison Based on Original Manufacturer COAs Henan Tongshang has conducted a detailed analysis based on the latest original manufacturer Certificate of Analysis (COA) documents from 2026. By comparing the key quality indicators of Dow Propylene Glycol, SK Propylene Glycol, and Shell Propylene Glycol, buyers can better understand the differences between these three popular […]2026-07-10Information Required Before Requesting a QuotationTo help us understand your requirements and provide an accurate quotation, please confirm the following information before submitting your inquiry. 1. Product Information Please specify the product you are interested in: For products outside our main product range, please provide the full product name, CAS number and intended application whenever possible. 2. Grade and Specification […]