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PE Wax for Hot Melt Adhesives

PE wax for hot melt adhesives is the main component that sets viscosity, open time and set speed. Carbon black provides color, UV protection and structural filling.

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Gun applying hot-melt adhesive to cartons on a packaging line

Hot-melt adhesives are used across a wide range of fields, from packaging to furniture and from hygiene products to bookbinding. A hot-melt formulation typically consists of three main components: a base polymer, a tackifying resin and a wax.

What PE wax determines

The wax is the lowest-viscosity component of the formulation and directly controls three critical properties:

  • Application viscosity: As the wax level rises, melt viscosity falls; this means application at a lower temperature and a thinner film.
  • Open time: Determines how long the adhesive stays tacky after application. A high-drop-point wax gives a short open time.
  • Set time: A fast-crystallizing wax provides the fast bonding that high-speed packaging lines need.

Choosing the type

High-density (HDPE) waxes give a fast set time thanks to their high drop point and sharp crystallization profile; low-density (LDPE) waxes provide a softer, more flexible film and a longer open time. Oxidized types improve adhesion to polar surfaces (paper, cardboard, metal).

The role of carbon black

In black adhesives and sealants, carbon black both gives color and protects against UV degradation. In applications exposed to the outdoors, such as automotive glass adhesives, this protection is functional, not cosmetic.

What to Watch For in This Industry

Leave a margin between drop point and application temperature

Working just above the wax drop point leads to viscosity fluctuations. Application 20–40 °C above the drop point is generally recommended.

Thermal stability matters in long tank holding times

In a melt held for hours in adhesive tanks, a wax with low thermal stability can cause discoloration and residue.

Acid value affects adhesion

The acid value of oxidized waxes (ASTM D1386) increases adhesion to polar surfaces; it has no effect on non-polar surfaces.

HDPE Wax Non-oxidized HDPE wax is a high-density, high-drop-point non-oxidized wax. It offers strong external… Drop point · °C 120 – 140 Viscosity (140 °C) · mPa·s 10 – 300 LDPE Wax Non-oxidized LDPE wax is a soft, low-density wax with a branched chain. For applications that need… Drop point · °C 100 – 115 Viscosity (140 °C) · mPa·s 150 – 2,000 Micronized PE Wax Micronized Micronized PE wax is a powder wax ground to micron size. A surface additive for paints… Drop point · °C 105 – 130 Average particle size (d50) · µm 5 – 15 PP Wax Non-oxidized PP wax is a polypropylene wax. With a high drop point and excellent compatibility with… Drop point · °C 140 – 165 Viscosity (170 °C) · mPa·s 50 – 800

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Industry-Specific Questions

Which type of PE wax is suitable for hot melts?

HDPE wax is preferred in packaging applications that need a fast set time and high heat resistance; LDPE wax in applications that need flexibility and a long open time. Oxidized types are an advantage for bonding paper and cardboard.

What happens if I increase the wax level?

Viscosity falls, application becomes easier and set time shortens; but beyond a certain point, bond strength and flexibility decrease. The typical level is 15–30% depending on the formulation.

My adhesive becomes brittle in the cold.

A highly crystalline wax may be in use. Switching to a lower-density, softer wax type improves low-temperature flexibility.

Resources

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