Hand lay-up is the oldest, simplest and most widely used process for manufacturing glass fiber reinforced plastic components.

Advantages of the process:

• Relatively low mold costs
• Large-format and complex components can be produced
• Particularly suitable for prototypes and small batches

Application:

• Medium-sized and large-area parts
• Machine covers
• Boat hulls
• Vehicle trailers
• Facade cladding

In contrary to hand lay-up fiber spraying is a semi-automated process. Therefore, a mixing gun is used on which a cutter is mounted that cuts continuous fibers (rovings) into a desired length of between 20 and 60 mm, depending on the application. Together with a hardener, the resin is introduced into the mold via the fiber spray gun. As with the hand laminate, subsequent compaction and deaeration is carried out using a roller and brush.

Advantages of the process:

• Manufacturing of large-area components
• Fast and cost-effective production
• Particularly suitable for higher volumes

The RTM process involves working under pressure, i.e., closed molds must be prepared in advance. A resin-hardener mixture is then injected into the closed mold via one or more resin injection ports, where it cures under heat and pressure. Additionally, to improve the resin flow, vacuum can be applied in the mold.

Advantages of the process:

• Very good, paintable surfaces on both sides
• Constant, high laminate quality
• Precisely defined wall thicknesses
• Sandwich constructions can be produced
• Particularly suitable for reproducible series production

In this process, the single-shell mold is first lined with fiber materials. Subsequently, the mold is sealed airtight with a special vacuum film and a vacuum of around 0.8 to 0.6 bar is applied. The liquid resin is now sucked or into this mold or injected additionally.

Advantages of the process:

• Low molding costs
• High laminate quality
• Particularly suitable for prototype production as well as for single piece production and small series campaigns

During the winding process reinforcing fibers are pulled through an impregnation bath with pre-accelerated resin and are then wound onto a positive core.

Advantages of the process:

• Production of cylindrical, oval, conical, and spherical bodies
• Partially automated process
• Precisely adjustable wall thicknesses

As a rule, the casting process is carried out without reinforcing fiber. The activated resin is poured into the mold manually or by machine, where it cures. Fillers are often used in this process as well, which can reduce shrinkage, create optical or color effects, and reduce material costs.

The pultrusion process is used to produce profiles and hence, it is also called the profile drawing process. In this process, a defined number of rovings are soaked in an impregnating bath, then bundled and pulled through a heated die for shaping and curing. Precise temperature control is required to ensure complete curing of the material when leaving the mold.

Pultruded parts are characterized by a relatively high glass content and correspondingly high mechanical stiffnesses.

In this process, the reinforcing materials – mat blanks, fabrics or already preformed mats (preforms) – are inserted dry into the mold. Two-part molds are required.

A predetermined amount of the activated resin is poured over the reinforcing material and the mold is closed immediately. The usually high reactivity of the resin leads to a heating of the mold to 40–70 °C and therefore to a rapid hardening of the component.

Pressing compounds (semi-finished products) made of SMC or BMC are used particularly for the production of high volumes of FRP components for the automotive and electrical industries.

SMC – Sheet Molding Compound – processing of the molding compound by compression molding and curing at temperatures of approx. 150 °C.

BMC – Bulk Molding Compound – introduction of the compound into the mold by injection molding or injection compression molding.

Short cycle times and high levels of automation can be achieved with both processes.

In the centrifugal casting, the cut glass rovings and the activated resin are simultaneously introduced into a rotating cylindrical mold. Through centrifugal casting the rovings are impregnated and are being ideally compressed under the effect of centrifugal forces.

Advantages of the process:

• Production of pipes, poles, rollers, and tanks
• Partially automated process
• Continuous processes possible
• Good surface properties

HYMER uses GREMOPAL® polyester resin to produce garage tubs, storage boxes, and tubs for holding gas cylinders. The quality of the polyester resin takes is of highest importance and influences the entire manufacturing process. Only polyester resins from Gremolith AG meet the requirements in terms of processing, achieving the required component stability, and a long-lasting durability.

Vacuum injection method

"Besides the reliable product quality, HYMER appreciates the delivery reliability and services of Gremolith AG."

Hubert Schmid, Strategic Purchasing, HYMER GmbH & Co. KG

Gremopal® polyester resins from Gremolith AG are used as base building material for the entire shell of a boat.

Hand lay-up

Andreas Nötzli, with his company a customer of Gremolith for many years, particularly appreciates the very fast delivery speed, the flexibility in building material design (color, requirements), and the high quality of the polyester resin.

Bodus provides solutions for various challenges in the field of sewer management, ranging from canal cleaning, canal and shaft inspection, sewer rehabilitation, and leak testing of pipelines to various products for sewer maintenance. We offer tailored solutions for every problem, construction site, and task.

Sewer rehabilitation

Daniel Boller, who has been a partner with Gremolith for many years through his company, emphasizes the reliability in deliveries and services. Additionally, he values our profound industry expertise and the straightforward collaboration with our team. The prompt handling of inquiries and orders is also positively acknowledged. Particularly commendable is our willingness to address challenges that arise at short notice and provide suitable solutions.

The resins provided by Gremolith proved to be extremely reliable and of high quality. They meet high demands on the technical properties as well as the aesthetic quality of CEM Composites products. The processing of the resin is simple and efficient, which makes it possible to optimize manufacturing processes and achieve high production output.

Casting

The successful cooperation between CEM Composites GmbH and Gremolith as a resin supplier already exists for a number of years.

The reliable delivery and excellent customer service Gremolith offers is appreciated by CEM Composites. Our ability to respond to individual requirements and support the development of tailor-made solutions is also particularly appreciated.

It is gratifying for us to know that Gremolith is a reliable partner at our side. We would like to thank Gremolith very much for the good cooperation and expressly recommend Gremolith as a resin supplier.

Cem Koeylueer, Managing Director of CEM Composites GmbH

Composites have excellent properties: they are lightweight, retain their shape even under the highest loads, and resist corrosion, rust and oxidation.

Glass fibre reinforced plastics, carbon components, sandwich components and composite materials with other materials (wood, metal, concrete, thermoplastics) are processed and designed by Müller Kunststofftechnik AG.

 Gremolith resins are used in the industrial sector, vehicle construction, medical technology and apparatus engineering.

Hand lamination

"I would like to emphasize that Gremolith is truly outstanding in terms of flexibility and reliability in delivery. Their ability to adapt to our changing needs has helped us a lot in many situations.

The quality of Gremolith's resinsis also remarkable.

The products you supply are always of high quality and meet our expectations in terms of durability and performance.

The professionalism of Gremolith AG customer services/support is exemplary.

Their staff are always courteous and competent, and they have always helped us quickly and efficiently in various concerns.

Overall, we are extremely satisfied with your company. The combination of flexibility and reliability in delivery, high-quality products and excellent customer service makes you a reliable business partner."

Ivo Lüthi, Owner and Managing Director of Müller Kunststofftechnik AG

Probst AG manufactures technical components, toys, and specialized sports equipment from fiberglass.

Their whitewater racing boats, made from carbon and Kevlar, are renowned worldwide and have won several world championships.

Probst AG is also active in container construction and coatings. Under the Greenbox label, they produce special plant boxes in all sizes.

Art objects and installations complete the fabrication range.

Everything from a single source: consultation, production of molds, components, manufacturing, and assembly.

Fiberspraying

Mr. Peter Probst states: We have and always had for many years a very good relationship with Gremolith . Technical information or problems are dealt with very quickly. The processing of orders and the dispatch of materials always run smoothly. Of course, exerting influence on the International Commodity Exchange is outside the sphere of influence of Gremolith AG. Nevertheless, the materials are always delivered on time. The quality of the products is high and remains constant, which is not insignificant nowadays.

On our 'scale', Gremolith AG achieves AAA.

Hugo Wolf AG stands out with a wide array of core competencies, including cabin construction (for cash desks, restrooms, control rooms, technical rooms, etc.), prototype development, contract manufacturing (for small to medium-scale series), the production of high-quality plant containers under the brand duroplant.ch, repairs of existing GRP parts, as well as carpentry and metalworking services.

Hand lamination, Fiberspraying

Through our long-standing partnership with Gremolith, we are pleased to have come to know an extremely reliable and committed company. Over the years, we have experienced Gremolith as a business partner that is always ready to respond to our individual wishes. Their ability to always complete orders on time and to our complete satisfaction is testament to their professionalism.

Ing. E. Plank GmbH has played a significant role in equipping approximately 70% of all television towers in Europe with their high-quality panels for directional and broadband antennas. Moreover, the company is a leader in the manufacture of casings for electromagnetic linear acceleration motors, including stators and ventilation nozzles, which are used in the world's largest roller coasters. The production of protective covers for motorhomes and the large-scale manufacture of siren boxes for federal air protection services complete the versatile range of services offered by Ing. E. Plank GmbH.

Hand lamination, Vacuum process

At Ing. E. Plank GmbH, we would like to acknowledge the outstanding partnership with Gremolith AG and express our satisfaction with the quality of your resin products and the accompanying service offerings.

For 10 years now, we have been regularly procuring resin products from Gremolith AG, and we wish to emphasize that the quality of your resins has consistently met our expectations. The high purity, reliability, and consistency of your resin products have significantly contributed to ensuring the quality of our own plastic products.

We value the punctuality and efficiency with which your products reach our factory. This reliable supply chain helps optimize our production processes and avoid bottlenecks.

Furthermore, we would like to highlight the excellent support provided by your team. We have always been promptly and professionally assisted with any questions, concerns, or special requirements.

Overall, the collaboration with Gremolith AG leaves us greatly satisfied. We especially appreciate the outstanding quality of your products and the excellent customer care.

We look forward to continuing our successful partnership and are happy to recommend your resin products to others.

Nord Composites is known for its wide range of high quality products used in a variety of industries such as automotive, shipbuilding, construction, public transport, rail, swimming pools, sports and leisure, sanitary, car body parts, wind energy, furniture and decoration.

hand lay-up, fiber spraying, RTM, injection process, winding process, poltrusion, casting, centrifuging

Throughout our 20 year relationship, which has been professional and cordial from the start, we have always been able to count on first class support and service.

The collaboration is characterised by consistent quality - no false notes, only high quality service and a genuine interest in customer satisfaction. This makes working with Gremolith a real pleasure and an asset to our business.

At Gremolith we don't feel like a customer. We feel like a partner.