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19. May 2020

Rampf: Keeping cars dry with PU and silicone sealing foams

According to Rampf Group, vehicles must be reliably sealed to keep moisture outside of the car. When driving in wet conditions, the water should always run off the car and not finds its way through the car door into the interior. Sealing foams based on polyurethane and silicone from Rampf Polymer Solutions play a central role in keeping cars dry.

Vehicles must be reliably sealed to keep moisture outside of the car (Source: Rampf)

Vehicles must be reliably sealed to keep moisture outside of the car (Source: Rampf)

In recent years, the variety of car doors and door modules has greatly increased, and with it their complexity, said the company. The reason for this is the growing number of integrated systems, such as door locks, window regulators, and loudspeakers. In the manufacturing process, these elements are connected to a door assembly carrier and then form the internal part of a car door as a module. The door modules, also known as door assemblies, are usually made of aluminium or long glass reinforced polypropylene plastic.

Depending on the composition and design of the door module, different material formulations (liquid or paste) and application processes (2D, 3D) are required. To protect the sensitive electronic components of a door module from dust, moisture, and water, it must be efficiently sealed. This demanding task is mastered by two-component polyurethane sealing foams of the Raku PUR brand, said Rampf.

Albert Schmid, Key Technology Manager Sealing Systems at Rampf Polymer Solutions, said: „Only the optimum combination of material and process technology ensures perfect sealing and guarantees reliable and long-term protection from moisture and chemical influences as well as various environmental impacts.“

However, the sealing foam not only protects the door module from external influences, it also ensures compliance with the Noise Vibration Harshness (NHV) standards that are widely used in the automotive industry. The polyurethane-based, two-component sealing foam from Rampf Polymer Solutions can make a significant contribution to keeping the occurring vibrations as low as possible.

Advantages of 2K-Raku PUR sealing foam:

The 2K PU sealing foams are applied in-situ using the FIPFG method (Source: Rampf)

The 2K PU sealing foams are applied in-situ using the FIPFG method (Source: Rampf)

  • Maximum functional reliability: very good properties with regards to sealing behaviour, resilience, compressibility, ageing, and hydrolysis resistance
  • High efficiency: fast curing, in-line production, and availability of parts
  • Uncomplicated compensation of high manufacturing tolerances: low assembly forces and soft material
  • Customised development: range of variation for polyurethane sealing material
  • Inexpensive sealing material combined with cost-effective seal production
  • Compliance with NVH standards
  • Sustainable materials – cure at room temperature and can be recycled at Rampf

The sealing foams are applied using the Formed-In-Place Foam Gasket (FIPFG) method. The seals are applied in-situ (on the spot) to the sealing groove of the door module. The two components of the sealing foam are first mixed together on a two-component mixing and dispensing system. The subsequent foaming is achieved by the chemical reaction of MDI isocyanate with water. After the liquid or paste-like sealing foam has been applied to the door module, the reaction begins shortly thereafter, and the foam expands.

Particularly for high volumes, as is common in the automotive industry, FIPFG technology has prevailed over other application options for door modules, said the company. Rampf Polymer Solutions works closely with Rampf Production Systems, a developer and manufacturer of mixing and dispensing systems.


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