When sourcing popsicles, you must prioritize food safety and ingredient transparency. Key specifications include Brix level (sugar content) to ensure consistent sweetness and freezing points, pH levels for stability, and the melting rate, which is critical for consumer satisfaction. Ensure the supplier uses high-quality stabilizers and emulsifiers to prevent large ice crystal formation, maintaining a smooth texture. For packaging, specify food-grade BOPP or PET/PE films with high moisture barriers to prevent freezer burn.