Among common commercial plastics, which one is typically the lowest cost per kilogram and widely used for films, containers, and molded parts?

Introduction / Context:
Cost awareness guides material selection. Among widely used plastics, polyethylene (PE) is commonly the lowest-cost large-volume polymer owing to massive global capacity and simple hydrocarbon chemistry.

Given Data / Assumptions:

• Commodity pricing varies regionally but trends persist: PE is generally cheaper than PVC, PC, or PTFE.
• Bakelite is a thermoset for specific uses, typically not the cheapest commodity by volume.
• “Polythene” is a common name for polyethylene.

Concept / Approach:
PE’s low cost arises from abundant ethylene feedstock and efficient processes (gas-phase, slurry). PVC can be inexpensive but often prices above many PE grades when considering formulation needs; PTFE and PC are substantially more expensive.

Step-by-Step Solution:
Survey relative commodity prices historically.Identify polyethylene as the typical lowest-cost workhorse.Select polythene (PE).

Verification / Alternative check:
Market reports consistently show LDPE/LLDPE/HDPE among the lowest price brackets in bulk polymers.

Why Other Options Are Wrong:
PTFE/PC: specialty, high-cost.Bakelite: niche thermoset, not a mass low-cost film/container resin.PVC: inexpensive but generally not below PE in most markets.

Common Pitfalls:
Assuming short-term price spikes overturn long-term cost hierarchy.

Final Answer:
Polythene (polyethylene)