Injection moulds
Design and manufacture of injection moulds in Gdańsk since 1993. Single- and multi-cavity, hot runner, two-component 2K moulds. Böhler-Uddeholm tool steel. Prototypes from 3 weeks.
What is an injection mould and why does its quality determine the product?
An injection mould is a precision steel or aluminium tool that shapes a plastic part during the plastic injection moulding process. Mould quality directly determines the final product — its dimensions, surface finish, strength and repeatability. A poorly designed mould generates defects: warping, short shots and weld lines.
At the MAJ-PLAST toolroom in Gdańsk we have been designing and manufacturing injection moulds for over 30 years. We operate a CNC milling centre, Mitsubishi EA EDM machines, surface grinders and Solid Edge 3D design software. We produce moulds ranging from simple single-cavity to complex multi-cavity with hydraulic slides and hot runner systems.
As an injection mould manufacturer in Pomerania, we serve clients from Gdańsk, Gdynia, the Tri-City area and across Poland. We export moulds to Germany, Scandinavia and the Benelux countries. Every mould undergoes injection trials on our Engel injection moulding machines — the customer does not need to arrange testing with a third party.
Types of injection moulds — from prototype to high-volume production
We begin injection mould design with a DFM (Design for Manufacturing) analysis — verifying that the part geometry is optimal for injection moulding. We propose modifications to reduce mould cost and improve part quality. We work with 2D drawings, 3D models (STEP, IGES, Parasolid) and physical samples.
Single-cavity moulds are used for prototypes and short runs — delivery from 3 weeks. Multi-cavity moulds (2, 4, 8 cavities) for serial production above 50,000 parts — lower unit cost. Hot runner moulds eliminate the cold runner, reduce waste by 15–30% and shorten the cycle. 2K moulds enable injection of two materials in a single cycle.
Aluminium prototype moulds are a fast, cost-effective solution for design validation — lead time 2–3 weeks, durability up to 10,000 shots. Ideal before investing in a steel mould. We produce moulds with slides and cores for parts with undercuts, side holes and complex 3D geometry.
Injection mould manufacturer in Pomerania — why MAJ-PLAST?
Injection mould production at MAJ-PLAST is an end-to-end process — from the first customer contact to delivery of the finished mould with approved samples. Our approach eliminates problems common to companies that outsource individual stages: design in one place, machining in another, testing in a third. At MAJ-PLAST everything takes place under one roof in Gdańsk — ensuring full control over quality and lead times.
Mould materials. We use exclusively Böhler-Uddeholm tool steels — guaranteed durability and repeatability. Standard grades: P20 (1.2311) for medium-run moulds, 718 (1.2738) for high-volume moulds with polishing, H13 (1.2344) for glass-fibre-reinforced resins, S136 (1.2083) for corrosive plastics (PVC). For prototypes we use aerospace-grade aluminium 7075.
Technologies in our toolroom. CNC milling centre with positioning accuracy of ±0.005 mm, Mitsubishi EA EDM machines (sinker and wire) for machining hardened steel mould cavities, surface grinders, Solid Edge 3D design software and MoldFlow analysis. Our engineering team averages 15 years of experience in injection mould design.
Injection moulds Gdańsk — location and logistics. The MAJ-PLAST toolroom is located at al. Grunwaldzka 311/A in Gdańsk — 15 minutes from the Port of Gdynia and the A1 motorway junction. For Tri-City customers we offer personal visits and pick-ups. For clients across Poland and Europe we arrange pallet and container shipping. Our injection moulds and stamping dies reach companies across the Pomeranian region as well as plants in Warsaw, Poznań, Wrocław, Łódź and Katowice.
Every injection mould produced at MAJ-PLAST undergoes testing on our Engel injection moulding machines. We perform 50–200 trial shots, optimise parameters (pressure, temperature, cooling time), measure the parts and provide the customer with a trial report together with first samples for approval. Serial production or mould shipment to the customer's plant begins only after acceptance.
Need an injection mould?
Send a 3D model — we quote within 24h.
Frequently asked questions
How much does an injection mould cost?
The cost depends on part complexity, number of cavities, material and runner system. Simple single-cavity moulds start from approx. PLN 15,000. Complex multi-cavity moulds with hot runners: PLN 80,000–200,000+. Free quotation based on 3D model.
How long does it take to make a mould?
Aluminium prototype: 2–3 weeks. Single-cavity steel mould: 4–6 weeks. Multi-cavity with slides: 8–12 weeks. Lead time includes design, machining, trials and correction.
Do you service moulds from other manufacturers?
Yes. We carry out repairs, cavity modifications, slide replacement, polishing and mould servicing — both our own and customer-supplied.
What steels do you use for moulds?
Standard: P20, 718, H13 (Böhler-Uddeholm). For special applications: S136 (corrosion), aluminium 7075 (prototypes). We select the material based on durability requirements and resin type.
Do you design moulds from scratch?
Yes. We design in Solid Edge based on 3D models, 2D drawings or physical samples. We perform DFM analysis and MoldFlow simulation on request.