Ningbo (P&M) Plastic Hardware Products Co. has 15 years of mold making technology for Overmolding mold. We have ISO 9001 certificates. We provide professional custom mold service and we are professional plastic mold manufacturer. We have sufficient experience in product raw material selection and mold material selection. We are well aware of the properties of various materials and the advantages and disadvantages of mold design. We will recommend suitable materials and professional design advice for our clients.
Overmolding Mold – Custom Overmold Tooling for Durable, Multi-Material Parts
Need a comfortable grip on a tool, a waterproof seal around a connector, or a soft-touch finish on a device? Our custom overmolding molds are the perfect solution. We design and manufacture precision molds for overmolding, allowing you to combine two or more materials into one seamless plastic part.
Ideal for consumer products, electronics, medical devices, and more — our overmolding solutions enhance both function and appearance.
What is Overmolding?
Overmolding is a process where a second layer of plastic is molded over an existing part — often made of metal or another plastic. This creates a finished product with multiple materials fused together, offering better grip, protection, insulation, or style.
You’ve seen it in:
Power tools with rubber grips
Toothbrushes with soft-touch handles
USB cables with flexible strain reliefs
Electronic connectors with sealed housings
We help you bring these features to your products with custom overmolding molds.
Custom Mold Design – Tailored to Your Product
Every overmolding project is different. That’s why we design each mold based on your unique part design and material combination.
We support multiple overmold structures:
Soft-over-hard plastic (e.g., TPU over ABS)
Plastic over metal (e.g., handles, inserts)
Multi-color or multi-texture finishes
Sealed joints and gaskets for waterproofing
Ergonomic grips and curved surfaces
We ensure excellent bonding between layers, clean parting lines, and consistent quality.
Suitable Materials for Overmolding
Choosing the right materials is key to a successful overmold. We help you select materials based on function, flexibility, durability, and appearance.
Common base materials (first layer):
ABS – Strong and impact-resistant
PC (Polycarbonate) – Tough and heat-resistant
PA (Nylon) – Durable and flexible
PBT – Great for electrical parts
Metal inserts – For added strength
Common overmold materials (second layer):
TPE (Thermoplastic Elastomer) – Soft, flexible, and grippy
TPU (Thermoplastic Polyurethane) – Resistant to wear and chemicals
Silicone-like plastics – For comfort or waterproofing
PP (Polypropylene) – Lightweight and flexible
We test for material compatibility to ensure strong bonding and long-lasting performance.
Overmolding Injection Process – How It Works
We use advanced injection molding techniques to deliver parts that are both functional and good-looking.
The process involves:
Insert or base part preparation – Can be molded by us or provided by you
Custom overmold tooling – Designed to wrap around or cover key areas
Second-shot injection – The overmold material is injected onto the base part
Cooling & ejection – The part is cooled and removed from the mold
Finishing & quality check – Each part is inspected for adhesion, appearance, and durability
We offer both two-shot molding and insert overmolding, depending on your product and volume needs.
Services We Provide
We’re more than just a mold maker. We offer complete solutions for your overmolded parts.
Custom mold design & manufacturing
Plastic part production – From prototypes to mass production
Component assembly – Including metal inserts or sub-parts
Secondary operations – Trimming, pad printing, packaging
Material sourcing & testing
Small batch or high-volume production
Whether you need soft grips, waterproof seals, or multi-material parts, we’ve got you covered.
Applications of Overmolding
Our overmolding molds are used in a variety of industries:
Consumer electronics – Earbuds, cables, chargers
Tools & hardware – Grips, housings, handles
Medical devices – Sealed components, ergonomic finishes
Automotive – Buttons, knobs, connectors
Industrial equipment – Impact-resistant covers, seals
Why Choose Us?
Custom-engineered molds for perfect fit and function
Fast turnaround – Prototypes in days, production in weeks
Expert design support – We help you optimize your part
Stable quality and precision – Tight tolerances, clean finishes
One-stop manufacturing – From mold to finished product
Global delivery – We ship worldwide
Get a Free Overmolding Mold Quote Today
Looking to create a high-quality overmolded plastic part? Contact us now for a free quote and let our team help you design, mold, and produce the perfect solution for your needs. We bring your product to life — with comfort, strength, and style.
We are plastic mold maker and can provide custom mold service, we can make injection molds, blow molds, rotational molds and die-casting molds.
For custom injection molds, we can provide professional custom injection molding services. Usually Plastic injection mold manufacturing Molding are manufactured using injection molding technology. The mold materials for injection molds can be chosen from P20, 718, S136, H13 and so on. The mold material reflects the mold life and product material requirements.
For parts that require blow molding production, we can also provide professional custom blow molding services.
Product Name |
Overmolding mold
|
Pls provide |
2D, 3D, samples, or the size of the multi-angle pictures |
Mould Time |
20-35 Days |
Product time |
7-15 Days |
Mould precision |
+/-0.01mm |
Mould life |
50-100 million shots |
Producing Process |
Audit drawings - mold flow analysis - design validation - Custom Materials - mold processing - core processing - electrode machining - Runner system processing - parts processing and procurement - machining acceptance - cavity surface treatment process - complex mode Die - The entire mold surface coating - Mounting plate - mold sample - sample test - sending samples |
Mould cavity |
One cavity, multi-cavity or same different products be made together |
Mould material |
P20,2738,2344,718,S136,8407,NAK80,SKD61,H13 |
Runner system |
Hot runner and cold runner |
Base material |
P20,2738,2344,718,S136,8407,NAK80,SKD61,H13 |
Finish |
Pitting the word, mirror finish, matte surface, striae |
Standard |
HASCO, DME or dependent upon |
Main technology |
Milling, grinding, CNC, EDM, wire cutting, carving, EDM, lathes, surface Finish, etc. |
Software |
CAD,PRO-E,UG Design Time: 1-3 days (normal circumstances) |
Product material |
ABS,PP,PC,PA6,PA66,TPU,POM,PBT,PVC,HIPS,PMMA,TPE,PC/ABS,TPV,TPO,TPR,EVA,HDPE,LDPE,CPVC,PVDF,PPSU.PPS. |
Quality system |
ISO9001:2008 |
Establish time |
20days |
Equipment |
CNC,EDM,Cutting off Machine,plastic machinery,etc plastic suitcase mould zhe jiang |
Plastic injection mold manufacturing Injection Mould making
1.We communicate product design according to samples/drawings and your requirements.
2.After the product design is confirmed, we carry out the mold design, we provide all kinds of injection molds, blow molds, silicone molds, die-casting molds services.
3.Material procurement, steel cutting and mold basic tools.
4.Mold assembly
5.Mold inspection, tracking and controlling mold processing.
6. We will inform you the date of mold trial and send you the sample inspection report and injection parameters together with the sample.
7.Your instruction and confirmation of shipment.
8.Prepare the mold before packing.
Plastic injection mold manufacturing molding Specification
1. Professional manufacturer, design, production injection mould and stamping mould quality control
2. rich export experience plastic injection mould and stamping mould
3. Reasonable price of design mould
4. Cavities: single or as per your requirements cavity
5. Treatment: S45C Pretreat>25Hrc,And Nitriding
6. Mould Steel: Cavity ,Core and slide: P20 ,2738,2136 available Moldbase :LKM available
7. Standard:DEM ,HUSKY,available
8. Hot runner: according to your demand
9. Life time: >300 Thousand Times
10. Package: Plywood case, anti-rust paint
Mold design:
Information you need to provide us
1. If you have drawings, 2D drawings, 3D drawings (preferably in STEP format).
2. If there are no drawings, you need to provide specific length, width, height and weight information. (It’s best to send us samples)
3. Should the mold be sent to your country, or leave the mold in our factory and we will help you produce the product.
4. Mold material requirements, cavity number requirements (you can tell us about the size of your injection molding machine)
5. Product material requirements and product quantity. (You can tell us about the use of the product and we can give you suggestions)
Mold testing:
Once the mold is complete, I do a mold test. It usually takes about 3-5 days to complete. We need to assemble the mold, adjust the pressure data of the machine, and try production. We need to check whether there are problems during the normal production of the mold and make modifications.
Packaging according to your needs
1.By air ,it takes 3-7 days for delivery .The goods can be shipped by DHL ,Fedex ,UPS .
2.By sea ,the delivery time is based on your port .
To South East Asian Countries takes about 5-12 days
To Middle east countries takes about 18-25 days
To European countries takes about 20-28 days
To American countries takes about 28-35 days
To Australia takes about 10-15 days
To African countries takes about 30-35 days.
Video-1: (Factory Video)
Video-2: (Injection Molding)
Video-3: (Blow molding)
Video-4: (Blow molding)
Video-5: (Roll molding)
Customer satisfaction is our most important goal. We focus on communication and cooperation with our customers, always pay attention to their needs and provide quick response and quality customer service. Our injection production mold factory is committed to establishing long-term relationships and ensuring that our customers receive the best after-sales service during the purchase and use of our products, and we will definitely do our best to solve any problems for our customers.
1. Who are we?
We are based in Zhejiang, China, start from 2014,sell to North America(30.00%),Southern Europe(10.00%),Northern.
Europe(10.00%),Central America(10.00%),Western Europe(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%). There are total about 51-100 people in our office.
2. How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment.
3. What can you buy from us?
Mould,Plastic Product, Metal Product,Dental Product,CNC machining.
4. Why should you buy from us not from other suppliers?
Ningbo P&M Plastic Metal Product Co., Ltd. We main do all kinds of 3d design, 3d printing and plastic metal molds tooling and products. We have our own engineer and factory. One-stop supply:3d design - 3d printing - mold making - plastic injection.
5. What services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU;
Accepted Payment Currency:USD,EUR;
Accepted Payment Type: T/T,L/C,PayPal,Western Union,Escrow;
Language Spoken:English,Chinese,Spanish,French,Russian.
6. What are the characteristics of your service?
1. Your inquiry related to our products or prices will be replied within 24hours.
2. Welltrained and experienced staffs to answer all your enquiries in fluent English.
3. Offering the support to solve the problem in the application or selling period.
4. Competitive prices based on same quality.
5. Guarantee samples quality same as mass production quality.