↓ Skip to main content

Fusible Plug Specialist

We produce all necessary eutectic fusible alloys in house. Compared to other suppliers who source fusible alloys from outside, we know how and we know why. This is very important for safety critical components.

What is Fusible Plug?
#

fusible plug example

Fusible plug, occasionally also called fuse plug, solder plug, is thermally operated non-reclosing pressure relief device that functions by yielding or melting of the fusible alloy1 sintered in plug body.

Fusible plugs only respond to over-temperature2. Compared to other type of safety devices, their structures are simpler and require no maintenance. Meanwhile they are very reliable if you buy from quality manufacturers like us.

Our Advantages
#

SINOMAS has been in this market for 25+ years. We treat quality above anything else. This is not only what we say, but also what we do, in many aspects that you might not be aware of. We have the test facility in house, ensuring that every product we deliver is fully qualified.

All fusible plugs can be custom designed based on your requirements. It can be either product development for new project, or replacement of existing fusible plugs of other brand3.

Plug Material Options
#

fusible plug structure

Fusible plug body can be made with the following materials:

  • Brass, optionally with Tin or Nickel plating
  • Stainless steel, corrosion resistant and high mechanical strength
  • Bronze, mainly used for steam boilers
  • Aluminum, for light weight demanding applications, for example aircraft wheel tires.

Due to the good machinability, brass is ideal for small batch (typically fewer than a few hundred pieces) custom orders. However brass fusible plugs can’t withstand high process pressure. Be sure to check with us before ordering.

Thread Type
#

Different thread types are popular in different countries and industrial segments. We are a global supplier and are familiar with the major thread specifications in the world: Metric, NPT, BSPP (G), BSPT (R), UNC, etc.

  1. Fusible alloys are low melting alloys (≤ 232°C) that are mainly comprised of Bismuth, Tin, Indium and Lead. The formulae are different for different temperature ratings. RoHS compliant fusible plugs are available upon request. ↩︎

  2. Available temperature ratings can be found in site page NPT Series. ↩︎

  3. We are not a retailer. MOQ applies to all orders if not in stock. ↩︎