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Silicone extrusion process

The silicone extrusion process is one in which the unvulcanized silicone rubber moves through the cylinder of an extruder with the help of an endless screw to the head of the extruder. In this location press against the profile placed with the previously designed form. The silicone formed according to the geometry of the utensil is then moved to a high temperature zone located in the rear area of the extruder and which is vulcanized by the action of the high temperature. Silicone vulcanization is the last step of extrusion. In this, the silicone sets its physical and chemical characteristics as well as the shape. The quality and wall thicknesses of the product are monitored by contactless control of the contours. In Merefsa this control is carried out with a latest generation reader, which provides a continuous quality traceability reading and with 4 artificial vision cameras guaranteeing the most demanding tolerance levels.

Our customers also have the service of marking the profile or silicone tube. Any type of text or numbering can be incorporated. In this process, high-precision printers are used that perform inkjet writing in various colors at high pressure. Recently, the acquisition of a state-of-the-art extruder line has been made that allows us to significantly improve the quality of our service and reduce our already short delivery times, as well as increase our range of silicone products with the manufacture of different densities.

Most common silicone extrusion products

Most common silicone extrusion products

Silicone extrusion tolerances in Merefsa

Silicone extrusion tolerances in Merefsa, regulations and certifications

The tolerance in the process of extrusion with silicone, unlike those that work with more rigid materials, depends on several factors such as the additivation of the compound, the temperature, the curing time, the contraction, etc.

There are 3 degrees of internationally accepted extrusion tolerance, "E" :

  • Clase E1 = High quality
  • Clase E2 = Good quality. (Standard in Merefsa)
  • Clase E3 = No Critical

Atoxicity guarantee

Atoxicity guarantee

In our laboratory we review and guarantee the silicone atoxicity regulations where we can comply with international standards suitable for medical and pharmaceutical use and suitable for food contact according to: FDA CFR 177.2600 (US Food and Drug Administration), BgVV BfR cap.15 (Bundesinstitut für Gesundheitlichen Verbraucherschutz Und Veterinärmedizin), USP Clase VI (US Pharmacopoeia), EC 1935/2004 Regulation, Journal officiel de la Republique Française brochure 1227.

Advantages of the extrusion process

Advantages of the extrusion process

  • Possibility of manufacturing a variety of shapes
  • The products are flexible and light
  • High efficiency in all products

Alianza Empresarial para la Vacunación Infantil
ED Empleo
Consorcio del Caucho
Control Energético


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In accordance with the provisions of the General Data Protection Regulation, 679/2016 of May 2016, (hereinafter, RGPD), we inform you that your personal data will be included in a file owned by Manufacturados Españoles de Resinas Fluoradas, S.L.U., with NIF B08207284, and located in Castelló 9, ( 08830) Sant boi de Llobregat, Barcelona. We treat the information you provide us with in order to provide you with the requested service as well as to maintain the commercial relationship in accordance with current legislation. The data provided will be kept as long as the commercial relationship is maintained or for the years necessary to comply with legal obligations. The data will not be passed on to third parties except in cases where a legal obligation exists. You have the right to obtain confirmation as to whether Manufacturados Españoles de Resinas Fluoradas, S.L.U. is processing your personal data. You are therefore entitled to access your personal data, rectify inaccurate data or request their deletion when they are no longer necessary. To do so, you must request it by e-mail to rgpd@merefsa.com, or by sending a registered letter to the indicated address.


Castello, 9 08830 Sant Boi de Llobregat

Barcelona (Spain)

Tel (+34) 933 372 081

Fax (+34) 933 374 373

Office Schedule

Monday to Thursday from 8:00 to 13:00

Monday to Thursday from 14:00 to 17:15

Friday from 7:00 to 14:15

Warehouse Schedule

Monday to Friday from 9:00 to 14:00

Summer Intensive Schedule

From June 20th to September 13th from 07:00 to 14:15

Summer Vacation

Closed from 05/08/2024 al 23/08/2024

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