MCP Quality

The alloys are produced from high-grade constituents, following strict specifications. Quality is monitored by an accredited system conforming to ISO 9002.

Several process factors govern the choice of an alloy for producing fusible cores, including:

• operating temperature of the mould,
• injection temperature and pressure of the plastic, and
• deformation temperature of the finished component.

A suitable choice matches these values with appropriate thermal properties of the alloy, including melt-out temperature, specific heat and latent heat of fusion. Mechanical strength also requires consideration.

The viscosity and surface tension of the alloys are low, making for easy flowing and accurate reproduction of detail.

It is also perfectly feasible to mould rubber components in the same way and to use the cores to lay up various fibres (e.g. G.R.P. and Kevlar) for forming and curing.

The Table does not give an exhaustive list of possibilities. Although it indicates the alloys most commonly used, the design process should take into consideration the possibility that another composition may prove more effective.

With proper attention to usage, the MCP low melting-point alloys can be re-used continually over periods extending into years. If the composition is found to have drifted away from the original specification, it can usually be corrected in-house by the user. For this purpose, a testing service is available at the Wellingborough production laboratory. The corrective amounts of constituents can be supplied as a specially formulated alloy.

Requires inert containment to prevent excessivedross formation during re-cycling. Lead-free.