Sample Request and Small-Scale Trial Guide: How to Validate Suppliers Efficiently with 1kg/25kg Orders

In chemical raw material procurement, sampling before bulk ordering is the lowest-cost way to avoid quality risk. A seemingly cheap quotation can cause losses far exceeding the sample fee if batches are unstable or indicators are misdeclared. This article presents a practical sample request and small-scale trial evaluation method.

Why You Must Always Sample First

"Same name, different quality" is extremely common in chemical raw materials: colour, purity and volatile content of the same grade may fluctuate between batches, directly affecting your end-product yield. Samples let you proceed with real data before placing a large order, rather than relying on verbal promises.

The Haiyu Zhonglong Sample Policy

To reduce customers' trial-and-error cost, we offer 1kg / 25kg order-quantity samples for most fine chemicals and elastomers, covering NPG, TMP, PTA, BPA, TMA, PEG, SEBS/SIS and more. 1kg samples are for laboratory evaluation, while 25kg can be used for line trials, helping you complete validation before mass production.

How to Evaluate After Receiving Samples

Step 1: check that the COA (certificate of analysis) matches your indicator requirements line by line (purity, moisture, colour APHA, melting point/hydroxyl value, etc.). Step 2: retain and seal samples for later comparison with bulk deliveries. Step 3: run a small-scale formulation trial under real process conditions to verify compatibility, reactivity and final performance. Step 4: assess batch stability — request COA from the last 3 batches and examine the fluctuation range of key indicators.

Red Flags for Risky Suppliers

① Cannot provide a formal COA, or only states "compliant" without data; ② Refuses samples or requires abnormally high minimum orders; ③ Prices significantly below market and cannot explain the source; ④ Vague about batch fluctuations. Be cautious in these situations.

Next Step

To request samples or specification sheets, submit your requirements via Online Inquiry (stating product, grade and intended use), or Contact Us to reach our technical sales team. The product list is in the Product Centre.