Melt Flow Index (MFI): meaning and role.
The Melt Flow Index (MFI), or Melt Flow Rate (MFR), measures how much molten polymer flows through a standard nozzle in 10 minutes under set conditions (g/10 min). It is a key rheological parameter for thermoplastics, inversely related to melt viscosity and indicative of molecular weight: low MFI means higher viscosity and molecular weight, while high MFI means lower viscosity and molecular weight.
The ISO9001 certification, another milestone in Viplas development.
Since 2001, we have been producing plasticizing screws and barrels for domestic and international customers, primarily serving major manufacturers of machinery and systems for plastic extrusion, molding, blow molding, and recycling. Those of you who already know us or who follow us more actively have witnessed how, since 2023, Viplas has embarked on a decisive […]
TPE-S: is it rubber or is it plastic?
A styrenic thermoplastic elastomer, or TPE-S, is a material intermediate between rubber and plastic—it has characteristics of both. Let’s look at them in detail: 🔹 Structure It is composed of styrene blocks (rigid) and elastomeric blocks (rubbery), typically butadiene or isoprene (e.g., SBS, SEBS). 🔹 Behavior • At room temperature → it behaves like rubber […]
Preview 2025
The start of a new year is the right time to analyze what 2024 has been and what we intend to achieve in the new year. The past year has been an important one, during 2024 the prices of polymers used in the molding and extrusion of plastic materials have shown downward variations, influenced by […]