Inserts are made of polyethylene of a high pressure of PVD or polyethylene of low pressure of PND, depending on preference of the customer. As a rule, most often use PVD since this polyethylene is more elastic. For special purpose inserts (heat-resistant) use special additives with the relevant structure of the insert.
Allocate several functions of inserts for big-races. The main destination of inserts for big-races it:
- Protection of hydrophobic materials against direct or indirect penetration of moisture in μR. Inserts provide to 100% protection and safety of production.
- Protection against dust and other external factors of influence.
- Protection on the contrary production from penetration in out of. Such inserts are used for transportation of liquids in μR for that transportation.
- Protection against free penetration of air. Of course it is not possible to provide tightness, but thanks to an insert the microclimate remains inside.
Inserts can be divided on categories of mission:
- Food insert. It is used in the food industry where direct contact of food products with an insert is meant.
- Technical insert. Wider range of use: in chemical sector, industrial, agricultural, etc. Requirements to such insert are significantly lower therefore it for reduction in cost of cost can is made with insignificant addition of secondary polymers.
- Suspendirovanny insert. Such insert already has the created mouth.
- Antistatic insert. Provides decrease in risks and possibility of a static stress.
- Heat-resistant insert. Provides the increased resistance to high temperatures from 120 °C to 200 °C