The melting point range of PVC blood bags

Data from various sources indicate differences in the melting point of PVC, primarily ranging between 160-212°C. Specific characteristics include:

No fixed melting point; it begins to soften at 80-85°C, transitions to a viscoelastic state at 130°C, and transforms into a viscous flow state at 160-180°C.

Some literature cites the melting point as 212°C or 170-195°C (decomposition temperature).

For medical-grade PVC, the heat sealing process is typically controlled at 140-160°C, with a melting point around 160-170°C.

Specificity of Medical-Grade PVC

Medical PVC must meet biocompatibility requirements, though its melting point is similar to that of general-purpose PVC.

During thermal processing, attention must be paid to the decomposition temperature (approximately 120-126°C), and the actual application temperature should remain below this threshold.

Reference Values for PVC Blood Bags

Based on a combination of medical and general data, the melting point range for PVC used in blood bags is approximately 150-200°C. Specific values may vary depending on material formulation (e.g., plasticizer content) and processing techniques.