For procurement specialists and formulation scientists, a thorough understanding of chemical properties and specifications is vital for making informed purchasing decisions. Diisononyl Phthalate (DINP) is a widely used plasticizer, and knowing its key characteristics ensures optimal performance in end products. This article breaks down the essential properties and specifications that buyers should consider when sourcing DINP.

At its core, DINP (CAS No. 28553-12-0) is a colorless, transparent oily liquid. This physical state is fundamental to its function as a plasticizer, allowing it to blend effectively with PVC and other polymers. Key technical specifications that define its quality and suitability for various applications include:

Purity: High-purity DINP, typically 99.5% or higher, is essential for consistent performance. Impurities can affect processing characteristics and the final product's properties.

Acid Value: A low acid value (mgKOH/g) is desirable, usually below 1.0. A higher acid value can indicate the presence of free acids, which may lead to undesirable side reactions or affect the stability of the formulation.

Color: The color is often measured on the Pt-Co (Platinum-Cobalt) scale, with a maximum limit (e.g., 300 max). A lighter color generally indicates higher purity and fewer colored by-products.

Heating Loss: This specification (often ≤ 0.4%) indicates the amount of volatile components present. Lower heating loss is preferred for better product permanence and reduced emissions during processing.

Freezing Point: DINP has a low freezing point (e.g., -25°C min), ensuring it remains liquid and easy to handle even in cooler climates.

Flash Point: A high flash point (e.g., ≥ 190°C) is important for safety during handling and storage, indicating a lower risk of ignition.

Density: The density typically falls within a range, such as 1.08-1.12 g/cm³. This parameter is important for volumetric calculations in formulation and logistics.

When you seek to buy DINP from manufacturers, always request a Certificate of Analysis (COA) for each batch, detailing these specifications. Understanding these parameters will help you ensure that the DINP you purchase meets your exact requirements and contributes to the superior quality of your final products. Trusted DINP suppliers will readily provide this crucial documentation.