Mold Release Agents
A good mold release agent (MRA) will allow the material to be removed quickly and effectively. Mold releases can reduce cycle times, defects, and browning of finished product. There are a number of mold release types available; they can be categorized as follows:
- Sacrificial coatings: the coating of MRA has to be applied each time because most of the MRA comes off on the molded part when it releases from the tool. Silicones are typical MRA compounds in this category.
- Semi-permanent coatings: the coating, if applied correctly, will last for a number of releases before requiring to be re-applied or touched up. This type of coating is most prevalent in today's rotational molding industry. The active chemistry involved in these coatings is typically a polysiloxane.
- Permanent coatings: most often some form of PTFE coating, which is applied to the mold. Permanent coatings avoid the need for operator application, but may become damaged by misuse.
Read more about this topic: Rotational Molding
... SunOS version Release date Code base Description Sun UNIX 0.7 1982 UniSoft UNIX v7 Bundled with 68000-based Sun-1 system SunOS 1.0 1983 4.1BSD Support for 68010-based Sun-1 and Sun-2 ... for multiprocessor (SPARCserver 600MP) systems first CD-ROM-only release SunOS 4.1.3 Aug 1992 SunOS 4.1.3C Nov 1993 SPARCclassic/SPARCstation LX only SunOS 4.1 ... SunOS 4 supported Sun-2 (until release 4.0.3), Sun-3 (until 4.1.1), Sun386i (4.0, 4.0.1 and 4.0.2 only) and Sun-4 (SPARC) architectures ...
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... This would become System V Release 4 (SVR4) ... On September 4, 1991, Sun announced that its next major OS release would switch from its BSD-derived source base to one based on SVR4 ... Although the internal designation of this release would be SunOS 5, from this point Sun began using the marketing name Solaris ...
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