Watering can

HDPE forms a light, hollow container for carrying and pouring water.

Watering can, illustrative image

Material

Hollow plastic body: HDPE

Material selection rationale

Low weight
Keeps the empty container manageable.
Tough hollow wall
Holds water while tolerating ordinary handling.
Hollow-body geometry
A handle transfers the weight of water into the body; local wall distribution matters more than the empty can’s lightness suggests.

How it becomes a product

  1. Form a hollow body: A representative route blow-moulds a heated HDPE tube inside a shaped mould.
  2. Finish and assemble: Openings are trimmed and the spout or sprinkler fittings are completed or attached, depending on the design. The chosen moulding and joining sequence creates the hollow body and spout path; any rose is a separate component.

Preparation routes

Ethene route

Catalytic addition polymerisation. A catalyst builds relatively unbranched polyethylene chains. This differs from the high-pressure radical process for LDPE even though both begin with ethene. The repeat formula alone cannot distinguish this material from LDPE: branch structure is the missing information that links catalyst choice to packing and stiffness.

Catalyst and process control determine chain structure. Some commercial grades use small amounts of comonomer; this overview follows the ethene backbone. Controlled chain length and comonomer content select a grade, rather than changing a pellet into a finished bottle.

  1. Poly(ethene): structure, manufacture and usesChemical Industry Education Centre, University of York

Sources

  1. HDPE watering cansTremalin
  2. Poly(ethene): structure, manufacture and usesChemical Industry Education Centre, University of York