Types of LSR Injection Molding​

There are many types of LSR materials. Some include:

• medical levels

The ability to be extracted for medical applications, which have extremely delicate criteria to prevent interfering with tissues, will be removed from an LSR in subsequent phases. The strength of the material is also increased by removing the extractables. Restrictive (implant for fewer than 30 days) and unrestricted are the usual classifications for these grades (implant greater than 30 days). The only difference between these classes typically is the degree of biocompatibility testing that was done on the substance. To assist clients in obtaining FDA clearance for their medical device, several suppliers create FDA master files.

• Self-lubricating:

It is possible to combine incompatible fluids with the parts. This substance will bloom to the surface to provide a slick surface when the silicone has dried and hardened. Then, depending on the pace at which the consumer wants the fluid to bloom, 1.5 to 3 percent of a phenyl fluid is added to the silicone.

• Conductive:

To the LSR components is put conductive-grade carbon black. In comparison to silicones packed with metal particles, these grades have very high mechanical qualities and may achieve volume resistivity as low as 9 ohm-cm.

• Self-bonding:

The addition of adhesion promoters. It provides primer-free adherence to a range of surfaces. The substance adheres nicely to polysulfones, stainless steel, aluminum, and nylons with glass filler. For composite seals, it provides the ideal means of reducing assembly components or achieving even greater sealing between two mating components.

• Radio Obscure

In order to make the silicone component visible under X-Ray, barium sulfate is applied. This works nicely for medical uses like catheters and wound drains.

• Flame Resistant

Without any additions, the majority of LSR rubber will satisfy a UL 94 HB grade. Higher grades, such V1 or VO, need for chemicals that break down and release water.

• Quick Cure:

A maker of LSRs can regulate the quantity of functional groups added as cure sites in the material, just like with ethylene propylene, where a terpolymer with double bonds is added, to adjust the degree of crosslinking of the elastomer. Higher reactivity is the outcome, which leads to extremely short cycle times for the mass manufacture of silicone components.