Thermoplastics

Launching a new gasket into production does not have to become a race of endless iterations. With a good design of extrusion tools and cutting moulds, you can shorten the time from idea to first valid series, reducing costs and surprises on the production line. In this guide, we explain how we work on the design and adjustment of tools to speed up industrialisation without sacrificing quality. The role of gaskets It all starts with the section of the profile. Based on the drawing or physical sample, we define the extrusion die (nozzle), the cooling and guiding calibrators, and the cutting method. The objective is for the final geometry to meet shape and measurement tolerances, with the expected hardness and elastic rebound. This is where a joint manufacturer makes the difference: the finer the adjustment of the die-gauge-cut assembly, the fewer iterations will be needed to achieve the right part. Shorter delivery times Precise and well-executed tooling significantly reduces the delivery times of the final product. When the tooling is manufactured with quality materials and tight tolerances, the extruded profile achieves its final geometry with only one or two adjustments, compared to the four or five that may be required with medium-quality tooling. This difference can mean a gain of two to three weeks in product delivery, as well as minimising adjustments and waste. At ISOGOM, we design each tool from the initial design stage, taking care of three key factors: This allows us to make the transition from profile conception to industrialisation shorter, more predictable and with consistent quality from the first series. Design for manufacturing: compression, drainage and tolerances A seal works if it seals with the right compression, drains water when necessary and fits into its channel without forcing. That is why the design incorporates: As a seal extrusion company, our job is to translate the design into a process: balancing geometry, material and tooling so that the seal works just as well in the sample as it does in the 10,000th run. -More info on rubber extrusion and plastic extrusion. Quality controls that save time later Measuring well at the beginning saves weeks at the end. In the pilot phase we apply: With this, the seal and profile trade that receives the production can rely on consistent batches, with no surprises between batches. Common adjustments and how we resolve them Even with a good design, there are typical adjustments that should be anticipated: Thanks to modular tooling and dies with micro-adjustment zones, these changes do not require the entire assembly to be redone, and the time-to-market remains short. Are you looking for a gasket manufacturer with its own tooling? At ISOGOM, we are gasket manufacturers with our own tooling design and construction. If you need to develop a new profile, migrate to another material or stabilise a reference, we accompany you from the prototype to the series, as a gasket extrusion company with total control of the process. We work for distributors and retailers of gaskets and profiles, as well as for OEMs and installers who require consistency, deadlines and technical support. Request your quote

If your shower screen leaks water or you notice limescale at the base, it’s time to check the rubber seal and the bottom water deflector. Here you will find the different types of seals for shower screens, how to measure them and step-by-step instructions for installing them without any complications. 1. Types of seals and where they are used 1.1. Rubber seals for shower screens They seal the joint between the glass and the profile to prevent leaks. 1.2. Lip-type rubber seal for shower screens For the edge of fixed or movable glass, it accompanies the closure without forcing. 1.3. Coextruded profiles for shower screens They combine a rigid body and a flexible wing, offering better watertightness and durability. 4. Lower water seal for shower enclosure profile Creates a small barrier at the bottom that returns water to the tray. For customised production or special replacements, see our extruded rubber profiles in the Extrusion services section. 2. How to choose the right size Choosing the right size is key to ensuring that the seal fits without gaps or friction. Measure the thickness of the glass, check the geometry of the edge and the actual space to be covered at the base. With this information, you can choose a profile and a water seal lip that will fit perfectly and prevent leaks.   Glass thickness: 6, 8 or 10 mm are the most common. The joint groove must fit without gaps. Lip height: if there is leakage at the base, look for longer lips on the lower weatherstrip. Radius and geometry: check whether the edge is straight or curved. Material: EPDM or TPE for better resistance to hot water, limescale and cleaning products. 3. Basic step-by-step installation Before installation, prepare the surface: clean off any limescale and soap residue, dry thoroughly and have a cutter, cloth and tape measure handy. Place the seal without stretching it, fit the weatherstrip firmly and carry out a quick water test to check for leaks. Cleaning: descale and dry the glass and profile thoroughly. Cutting to size: use a sharp cutter and guide for straight cuts. Fitting the seal: fit from one end of the glass without stretching the material. Installing the lower water deflector: press until you hear the “click” of the fitting. Check that the lip rests on the tray. Watertightness test: turn on the water and check the seals and corners. 4. Signs that you need to replace the seal You will know that it is time to replace the seal when the rubber is stiff, cracked or whitish, if puddles appear next to the bottom profile, if there are leaks around the corners or if you notice that the lip no longer rests properly on the tray. It is also a sign of wear if it creaks when opened, the panel loses its fit or, despite cleaning the limescale, drops continue to filter through after showering. If any of these symptoms occur, replacing the seal will restore the watertightness and extend the life of the screen. 5. Common mistakes and how to avoid them Choosing a lip that is too short: it does not return the water to the tray. Installing with dirt or moisture: reduces grip and service life. Stretching the seal when fitting: it then shrinks and leaves gaps. Do you need a custom-made weatherstrip? At ISOGOM, we manufacture custom-made profiles and seals for manufacturers and installers. Check out our processes and certificates on the Quality page and tell us about your case.

If you notice draughts or small leaks, it is probably time to check the rubber seals for glass in aluminium windows. In this guide, you will see what options are available, when to choose EPDM seals or PVC window profiles, how to measure the channel and glass correctly, and the basic installation to restore the seal without complications. 1. Types of seals for aluminium windows 1.1. Rubber seals for aluminium window glass They provide a perimeter seal between the glass and the profile, improving thermal and acoustic insulation and reducing vibrations when closing. 1.2. PVC window profiles A practical solution for quick replacements. They offer a good visual finish and are easy to install when not used intensively or indoors. 1.3. EPDM seals Material with high resistance to UV rays, temperatures and cleaning products. Ideal for outdoor exposure and demanding climates. 1.4. Rubber profile manufacturers At ISOGOM, we are rubber profile manufacturers, designing and extruding custom seals for short runs or continuous production, with technical advice and quality control. Check out our extrusion services. ISOGOM designs and extrudes customised seals and profiles for short or long runs, with quality control and technical support. Check out our services. 2. How to choose the right size A correct measurement ensures a uniform seal and prevents gaps. Note the actual thickness of the glass, the width and depth of the aluminium profile channel and the gap to be covered. With this information, you can decide on the optimum geometry and hardness for each window.   Glass thickness: 6, 8 or 10 mm are the most common. The seal groove must fit tightly. Profile channel: check the width and depth to prevent the seal from coming out. Material: EPDM for outdoor use and high durability; PVC for indoor replacements. Hardness and geometry: choose Shore A and lip shape according to closing pressure and gap. 3. Step-by-step installation instructions Prepare the area before you start. Clean the glass and profile thoroughly, dry completely and have a cutter, cloth, tape measure and isopropyl alcohol handy. Place the seal without stretching it, check the fit of the leaf and perform a quick test to ensure there are no gaps. Cleaning: remove dust, limescale and old sealant residue. Cut to size: make straight cuts and, if you reach a corner, make precise mitre cuts. Fitting: fit from one end without stretching the material. Check: open and close the window; it should not rub or come loose. Final test: check for leaks with a backlight or a little water. 4. Signs that the seal needs to be replaced When the rubber hardens, cracks or turns white, air or water leaks appear, noise increases with the window apparently closed, or the sash loses its fit and vibrates, it should be replaced. If, even after cleaning and adjusting the fittings, leaks or condensation persist, a new seal will restore the watertightness and prolong the life of the window or door. 5. Common mistakes and how to avoid them Choosing a profile that is too soft or too short for the actual clearance. Installing with dirt or moisture, which reduces grip and service life. Stretching the seal during assembly; when it shrinks, it leaves gaps. Not checking compatibility with the aluminium profile channel. Do you need a custom profile? At ISOGOM, we manufacture specific seals and profiles for manufacturers and installers. Check out our processes and certificates in Quality and tell us about your case.