Tip: Put a question mark (?) at the end of your search to jump directly to related words. New RhymeZone features: Advanced search, Example sentences, Spanish version.
Thermal cracking. In thermal cracking, high temperatures (typically in the range of 450Â°C to 750Â°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
In transparent parts, you will usually see these internal cracks before the molded part fails. The cause of this type of part cracking is internal stress caused by high plastic pressure during molding. This stress can be caused by a cavity pressure that is either too high or too low. The solution to an internal part cracking problem is to change the packing pressure. Cracks in Corners â When cracks appear in the corners of plastic parts, the cause is too much plastic shrinkage onto the mold core in that corner.