manufacturing of PP products

Industrial gaskets, custom technical articles, semi-finished products, valve seats and insert rings

Polypropylene is often used as disks, rings, filter plates, flanges, bushings, blocks, strips, plugs, screws, nipples, shutters, support elements, plates, housings, rolls and grills.

PP is one of the most requested plastic materials: chemical resistance, hardness, stiffness and mechanical strength have allowed the use in various fields such as textile, packaging, food machinery, medical, pharmaceutical, electrical applications and as industrial components.


The polypropylene (PP) is a thermoplastic semi-crystalline product with propylene polymerization (H3C – CH = CH2) and belonging to the family of polyolefins. The types of polypropylene on the market have very different characteristics between them: this ensures the continued expansion of the range of products made of this material. Depending on the arrangement of the CH3 groups are formed various types of polypropylene, as the PP-I (isotactic), the PP-S (syndiotactic) and the PP-R (atactic). Then there are the special variants of polypropylene, such as PP-C (chlorinated), the PP-B (block), the PP + EPDM, the PP and the PP + talc + barium.

The polypropylene is processed in the most disparate manners: is injection molded, is worked by extrusion, can be expanded, can be thermoformed, it can undergo treatments such as printing, painting, welding or bonding and can be worked mechanically through removal chip.

Generally the PP has high rigidity and hardness, besides a high resistance to dynamic loads. It can work at temperatures above 100 ° C over long periods and at 140 ° C on short periods; It tends to become brittle at low temperatures. It has very good electrical characteristics and has a very low absorption index and water permeability. The PP is very resistant from a chemical point of view: up to 120 ° C retains its characteristics in contact with saline and acidic solutions. The gases, hydrocarbons and chlorinated hydrocarbons spread through the PP, thus tending to inflate. At room temperature the PP is susceptible to attack by strong oxidizing agents and in the presence of oxygen degrades. The artifacts in the PP are usually translucent.

The particular characteristics of polypropylene allow use in various sectors. The PP can be used to accomplish particular mounted in filter presses, valves, installations galvanizing, acid baths, pipes for waste water, pickling plants, piping for exhaust gas and food processing plants. In addition, the PP has many applications in the medical field: can be sterilized and can come into contact with human body parts. The atactic PP, in particular, can be employed to achieve anticorrosive tapes, insulating tapes and ribbons of aging resistant cover. The isotactic PP, however, has various fields of application: car interiors (ventilation systems, instrument panels, drawers, slots), containers, functional parts for household appliances (washing machines, fans, coffee machines), car body parts, parts for pumps, fan blades, electrical installations and furniture garden. Other types of PP (PP-Q, BO-PP, PP-M, CR-PP) are finally ideal for the fabrication of containers for liquids, bottles, electronic components, coatings for pipes and cables, tapes for packaging, bags and packaging transparent.


Shown below are the most common PA trade names available at LIMA.



Shown below are the most common trade names for the PP material.

Please remember that LIMA can provide both generic materials and materials covered by trademark (ie that show the TM or ® endorsements), based on the requirements of the customer. If the customer wishes to details made of plastic material covered by trademark, LIMA will stock up directly by the holding company of the said trademark.