Design For Manufacturability

Design For Manufacturability

At WEISS PRECISION, we firmly believe that the design of a component holds immense significance, influencing no less than 80% of its cost. It also has a far-reaching impact on various aspects such as quality, reliability, functionality, serviceability, and manufacturability. Furthermore, the design of a product plays a crucial role in determining the speed at which a new product can be launched, thereby acting as a driving force behind a company’s competitive advantage.

This is precisely why we place a strong emphasis on design at WEISS PRECISION, focusing on design for use, design for manufacturability, and design for competitive advantage. Our ultimate goal is to maximise our client’s success and we understand that the design and engineering process holds paramount importance in achieving this objective.

This is precisely why we place a strong emphasis on design at WEISS PRECISION, focusing on design for use, design for manufacturability, and design for competitive advantage. Our ultimate goal is to maximise our client’s success and we understand that the design and engineering process holds paramount importance in achieving this objective.

WEISS PRECISION’s Keys to Success

And we will get back to you ASAP.

Material Selection

Our decades-long experience with injection-molded plastic material selection will benefit you. As we work closely with our resin suppliers, we can help you choose the best material to meet your needs at the right price, from basic polypropylene to engineering-grade ABS and polycarbonate.

Choosing the right material for your project

Our team of experienced project engineers evaluates your product’s end use during the project development phase to determine whether or not additives or special colors are necessary. What are the product’s requirements? Does it need to be fire retardant, UV light/extreme temperature, or chemically resistant? With WEISS you are guaranteed to find the right material for any end-use application.

Engineering grades Thermoplastics

  • ABS
  • Polycarbonate
  • AB/Polycarbonate Blends
  • Nylon
  • TPE
  • Acrylic

Commodity grade thermoplastics

  • Polystyrene
  • Polypropelene
  • Polyethylene
  • High impact Polystyrene

Scientific Injection Molding

Scientific injection molding involves establishing predictable, repeatable plastic injection molding parameters using predictable facts and data. With a focus on part design, mold design, material selection, and measurements of plastic injection molding process parameters, WEISS Precision systematically controls variables that could result in defective parts.


Weiss-Precision applies the latest scientific injection molding practices and tools, coupled with the experience of our highly trained team and innovative engineering, to ensure optimal plastic injection molding process control, repeatability and part quality.

  • Higher yield and low material consumption
  • Repeatability across set-ups and material lot
  • Better flow analysis


Plastic injection molding process parameters controlled by scientific injection molding include:

  • Robust part design
  • Hold Pressure
  • Mold Temperature
  • Melt Temperature
  • Mold design and build
  • Cooling Time
  • Critical performance criteria
  • Filling, flow and cooling analysis and engineering
  • Quality planning
  • Integrated operation requirements
  • Proper material selection
  • Repeatable process
  • Part ejection and handling
  • Ergonomics

Data Analysis

When scientific injection molding practices are applied, problems may be isolated and data is gathered to document and scientifically eliminate them.In real time, mold transducers provide feedback on the process to assist and facilitate the process.

Here is a sample of process data and chart profiles:

Fill optimization (fill optimization curve)

  • Fill cavity at several speeds under pure velocity control
  • Record fill time and peak plastic pressure at each velocity
  • Chart relative viscosity as a function of fill time

Pressurisation and gate freeze

  • Fill cavity to 95-99% under controlled velocity
  • Set hold pressure at 50-70% of peak fill pressure
  • Increase hold time at constant intervals for each shot
  • Record and chart part weight versus time

Pressure loss study

  • Fill the cavity to transfer position and record peak pressure
  • Reduce shot size and fill cavity to post-gate position
  • Reduce shot size and fill cavity to pre-gate position
  • Repeat as necessary by reducing shot size to fill to areas of desired pressure measurement


WEISS PRECISION, puts a strong focus on innovation. Using ISO guidelines, our Quality Management System (QMS) ensures every step we take is headed in the right direction. We ensure lasting success for our clients, ourselves, and our industry by combining our deep manufacturing expertise with independent experts from around the world. Each employee at WEISS Precision plays a critical role in providing high-quality plastic injection molds and molded components consistently and effectively. The team strives to produce plastic injection molded parts that meet the expectations of the customer by following controlled procedures, work instructions, visual standards, and quality plans.


We have a team of highly skilled employees who specialize in metrology to service our extensive market, performing to some of the tightest tolerances in the industry. To assist with developing the most consistent and accurate
measurement techniques for quality plastic injection molding projects, we have developed long-standing relationships with our customers.

  • Coordinate Measurement Machines (CMMs) (Zeiss and Brown and Sharpe)
  • Part scanning
  • Optical measurement
  • Air gaging
  • Custom-built inspection systems with data collection and reporting (real time)
  • Gloss meters
  • Color spectrophotometers
  • Tensile testing
  • Ash testing
  • Melt flow and volume testing
  • Pressure vessel testing
  • Leak testing
  • Force measurement (push/pull)
  • Surface plates and a wide variety of hand gagging

Data Analysis and Validation Submission

A variety of methods can be employed to analyze data, including color-coded PDF laboratory reports, Minitab reporting, Excel spreadsheets, and real-time statistics. In order to best meet the needs of our customers, we offer a variety of types of data output.

Typical submissions are

  • Advanced Product Quality Planning (APQP)
  • Production Part Approval Process (PPAP)
  • IQ, OQ, PQ Validation Protocol
  • Initial Sample Inspection Report (ISIR)
  • Device History Records (DHR)Certificates of Compliance
  • Certificates of Analysis


  • Sterilisation services are established and used for our customers’ products based on the quality planning activities at the start of each medical project.

Early Supplier Involvement

With early supplier involvement (ESI), relationships are formed early on in the engineering and development process, starting with concept and design work. Through ESI, we are able to create products that are high quality and low cost.

Benefit by Partnering Early on in the Project and Design Process

We have proven repeatedly that extra effort up front ensures success, which is why WEISS Precision considers ESI one of the two most critical factors in plastic injection molds and molded parts development. With the help of ESI, we enable proactive communication and collaboration on product specifications, performance, design, material, and much more. During the crucial planning and design phases, integrated WEISS Precision expertise will benefit your design team by:

  • Expertise on the latest materials and plastic injection molding technologies to optimize product and manufacturing solutions
  • Incorporation of design for manufacturability right from the start
  • Elimination of potential problems early on to save time and cost
  • Reduction in development time to get to market faster
  • Engineer out cost – engineer in quality and optimal performance

WEISS understands the importance of plastic for your business.
Innovation takes place here.

Contact Us