Selecting the appropriate grade of Ammonium Polyphosphate (APP) is crucial for optimizing performance in various industrial applications. As a premier manufacturer and supplier, understanding the distinct characteristics of APP Phase I and APP Phase II is key for our clients seeking the best flame retardant solutions. This guide will help you navigate these differences and make an informed decision.

Ammonium Polyphosphate (APP) Overview
Ammonium Polyphosphate is a halogen-free, non-toxic inorganic salt widely recognized for its excellent flame retardant properties. It functions primarily through an intumescent mechanism, forming a protective char layer upon exposure to heat, thereby insulating the substrate and preventing fire propagation. Its versatility makes it a sought-after additive in plastics, coatings, textiles, adhesives, and more. As a reliable Ammonium Polyphosphate supplier, we ensure our products meet stringent quality standards.

APP Phase I: Properties and Applications
APP Phase I is characterized by shorter, linear polymer chains. While it offers effective flame retardancy, it is generally more sensitive to water (hydrolysis) and exhibits lower thermal stability compared to Phase II. Decomposition typically begins at temperatures above 150°C. Its properties make it suitable for applications where moisture exposure is limited and moderate thermal resistance is sufficient. If you are looking to buy Ammonium Polyphosphate for specific applications such as certain types of intumescent coatings or as a fertilizer, Phase I might be a consideration. However, for applications demanding higher performance and durability, Phase II is often preferred by manufacturers.

APP Phase II: Enhanced Performance and Stability
In contrast, APP Phase II features longer, cross-linked polymer chains, offering significantly higher thermal stability. Decomposition starts at around 300°C, making it ideal for high-temperature processing and demanding fire safety requirements. Its lower water solubility and improved compatibility with various resin systems make it a superior choice for advanced flame retardant formulations. Manufacturers seeking to buy Ammonium Polyphosphate for high-performance plastics, solvent-based and water-based intumescent coatings, or flame-retardant textiles often choose Phase II. Its robust nature ensures sustained fire protection, even under challenging conditions.

Choosing the Right Phase for Your Needs
The selection between Phase I and Phase II depends heavily on the specific end-use requirements. For applications where cost-effectiveness and moderate performance are key, and water sensitivity is not a major concern, Phase I might suffice. However, for applications demanding superior thermal stability, moisture resistance, and long-term fire protection, such as in construction materials, automotive components, and electronic casings, APP Phase II is the recommended choice. As a leading Ammonium Polyphosphate manufacturer in China, we offer both phases, ensuring you can find the perfect fit for your formulation. Partner with us to secure a consistent supply of high-quality CAS 68333-79-9.

Partner with a Trusted Supplier
Ningbo Inno Pharmchem Co., Ltd. is dedicated to providing high-quality Ammonium Polyphosphate to meet the diverse needs of the global market. Whether you require APP Phase I or Phase II, our team is ready to assist you in selecting the optimal product and providing competitive pricing. Contact us today to discuss your requirements and secure your supply of this essential halogen-free flame retardant.