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How To Avoid Corrosion

Corrosion is a major cause of expenses for the injection molding industry. In the plastics industry, the costs do not only pertain to mold damage or repair. The breakdown/shutdown of a machine can also be caused by corrosion, resulting in production delays and productivity losses.

Many factors determine how you can prepare for proper corrosion control. Plastics with fillers, for instance, are particularly abrasive and can eliminate the mold steel after several cycles.

injection mold


Plastic with high melt temperatures exposes mold to greater heat and results in higher wear and tear than plastic with low melting points. Corrosive vapors or residues are emitted by certain materials, leading to extra cleaning and corrosion prevention. Complicated molds often get overlooked.

Mold presses, slides, lifters, and moving cores, as well as mechanics and hydraulics, are also susceptible to corrosion issues. This is especially so with an abundance of corrosion vapors from PVC molding and several other types of substances.

mould components

Sprue bushings are as important, if not more, than the interior surface of a mold. Rusty sprue bushings prevent the barrel nozzle from sealing properly. The bases that are damaged when they are clamped to the platens could cause issues with holding the mold halves parallel. This could cause flash or an excessive pressure on the clamp.

When a mold is put into production, the type of material used and the method of application can help prevent the bleed out of solvents and anti-rust coatings. When bleed-out occurs, components may be marked with antirust/grease/oil material for hours prior to the initial molding process.

When the mold protectant is unable to mold off in a proper manner then an solvent cleaner is typically used to eliminate it. In this process of removal, some solvent generally penetrates through the ejector pins , and it contaminates the lubricant within the box for pins. The result is thinning the ejector pin lubricant, which then oozes out past the pins, leaving marks on the part that was molded.

Right protection

The right mold protection and corrosion preventive will provide about a year of protection while the mold is stored. The best part is that they won’t need to be scrubbed before starting up because they flash off during the initialization process. This reduces the risk of normal bleed out issues.

Certain rust-preventive products are great for long-term storage (3 or 5 years) however, they may require cleaning in order to get their residue from mold prior to manufacturing. Rust preventives should be formulated with neutralizers to ward off attack from acidic fingerprints.

Some have a light blue dye, which is easier to see areas of coverage. People those who mold PVC or other resins that are fire-resistant have to contend with the acid vapors that are released during molding.

Acid vapor neutralizers are constructed to be extremely durable to avoid corrosion due to the vapor that is released from those resins. You must take daily steps to clean the mold by the end of the day in order to perform proper mold maintenance.

Ensure that the next time you open your mold, it will keep producing like it did earlier in the day by cleaning it thoroughly with an excellent solvent cleaner and degreaser, and applying a rust preventive.

Why Choose Contract manufacturing

Contract manufacturing is a process under which a company does not manufacture its products. The production activities are outsourced to contract manufacturers. Contract manufacturers are those who manufacture other company’s products on a contract basis.

Contract manufacturers are expert persons in the production process. Companies put their own label and packaging on the products manufactured by contract producers.

Companies provide full details like types and specifications of products it wants to the outsourcing manufacturers. Sometimes the company even provides the raw materials to the outsourcing manufacturers.

There are some standards decided and explained to the outsourcing producers by companies. These standards are used for inspection of goods manufactured by another manufacturer.

Products are required to pass these standards during inspection. Contract manufacturing is beneficial for the company as it helps in minimizing cost and focusing on more functional areas.

Advantages of Contract Manufacturing

Economies Of Scale

Contract manufacturing helps in minimizing the cost of production for the company. Under this, the company does not manufacture its products itself. Rather the production activities are outsourced to other manufacturers.

These manufacturers produce large amount of products for different customers. This helps them in acquiring cheap materials in bulk and takes advantage of economies of scale. The more they produce the less the cost would be.

More Focus On Selling Activities

Contract manufacturing helps companies in paying attention to functional areas. Selling of products is important task for the businesses. It needs to face tough competition in the market to survive. Companies, through outsourcing of its production activities, get more time to focus on these activities.

Quality Products

Under contract manufacturing, products are not manufactured by the company itself. Companies basically outsource their production activities to contract manufacturers. These manufacturers are highly skilled and expert in production activities.

They produce high-quality products at lower costs. This helps companies to provide good quality products to its customers.

Saving Cost

Contract manufacturing helps the companies in saving huge capital required for setting up the production process. Companies are not required to invest large amount in production plants and several other types of equipment.

It saves the company cost of labour involved in paying wages and training. Thus the companies outsource their production activities to low-cost countries.

Easy Entry In Markets

There are various trade barriers in many countries to perform business there. Companies cannot enter and sell their products there. Under contract manufacturing, it becomes easy for companies to enter into different countries.

They give the contract to the manufacturers in different countries producing their products. It helps in entering different markets.

Disadvantages of contract manufacturing

Quality Issues

This is one of the risks involved in contract manufacturing. It is essential for companies to inspect the products manufactured by contract manufacturers. They need to develop certain standards for testing of their products. Contract manufacturers may not produce products meeting the required standards.

Lacks Control

Under contract manufacturing, companies lose control over production activities. Contract manufacturers produce products as per their skills. Companies may not be able to control or directs manufacturers for the production of their products.

It is also possible that contract manufacturers are not able to deliver the required product.

Lack Of Flexibility

Companies under contract manufacturing lose the ability to respond to market conditions. There are always great fluctuations in the market regarding the demand for its products. Companies do not have direct control over production activities.

They cannot affect its supply chain. It becomes difficult for them to fulfil their customer’s demands.

Delay In Delivery

Contract manufacturers are those who are expert in production activities. These manufacturers produce products not of one company but of different companies.

They carry production activities on a large scale. Sometimes, due to workload, they may not be able to produce the company’s products on time.

Outsourcing Problems

Under outsourcing, companies contact manufacturers of different countries. These manufacturers are basically of low-cost countries. Different countries have different cultures, traditions, language and lead times.

This difference among countries makes it difficult for companies to manage its contract manufacturers.

6 Tips for negotiating agreements to Contract Manufacturers

A contract is an agreement between the supplier and the customer which should define expectations and assumptions from both parties. When done properly, contracts are essential for creating structures and recording crucial information regarding timelines and workmanship.

In full disclosure, few companies at all will ever be able to legally make a contract binding, and Chinese suppliers will not offer much credence to any legal document. The most significant reason to create the document was to initiate an exchange of ideas at the beginning of a brand new partnership to (a) record the most critical details for the launch of your product and for regular supply chain needs to ensure you can (b) your business relationship begins on a positive note.

Here are six suggestions for things to consider when structuring agreements between contract manufacturers in Asia:


“Quality” is a subjective term only brought into focus with technical details and measurements. The concept of workmanship is usually understood different between a vendor and a client. Clear agreements regarding quality assure that the final product is manufactured in accordance with established quality standards. Both parties should agree how quality will be assessed, examined, and what degree of quality is acceptable and unacceptable. There are a variety of standards regarding fit and finish, performance, and packaging , which could be classified as categories such as “minor” as well as “critical.” The agreements should cover these as well as frequencies and the conditions to be able for factory audits as well as pre-shipment inspections , or PSIs. With travel by company personnel nearly impossible, third-party sources and QC agents are a good idea. Engaging a China sourcing agent is an effective tool for ensuring high-quality control during pandemics.


A contract manufacturing agreement must include specific terms describing the timing of production runs as well as delivery. If penalties for late delivery dates are mentioned, they should be explained that this is due to your brand being penalized by your customers. Production schedules are usually unplanned by the manufacturers and are based on the priority given to high volume customers. Delays can last for more like months than just days particularly during busy times like Chinese New Year and prior to Black Friday.

Modifications to Products

Modifications from both sides are common especially during the initial production runs. Brands should be solely responsible for any changes to design and materials. As changes from original drawings are made, it could be difficult to determine who owns any intellectual property rights to the designs: the buyer or the supplier. Be aware of who is responsible for the new tooling or development work. A detailed written agreement defines who owns IP rights in certain situations. This offers additional security to businesses concerned about IP theft.


The actual cost of manufacturing is subject to fluctuations which means the factory may be able to raise costs even after negotiations have begun. Factors such as fluctuations in currency as well as material and the cost of labor can significantly impact production costs. While tariffs can significantly affect landed costs they should be treated separately from the manufacturing cost.

The rising costs of manufacturing are worldwide and not isolated to China. Contracts should include the specifics of how and when the manufacturer may alter costs from the original quotation. In normal times, it’s not unusual to request price incentives for volume or tiered pricing when possible that reward promises of quantity and goals. Without such an agreement it’s not usually a breach of contract to escalate prices until the purchase orders has been made and accepted.


Service levels are broad based on aggregates and the results of all of the above over periods of time. In Western traditional usage, they are typically measured as KPIs. Agreements should also articulate whether or not you intend to review these at what frequency, and any corrective measures or penalties to be implemented if the level of service is not in line with accepted standards. Conversely there should be some kind of incentive or reward for the service provider should KPIs meet or exceed established benchmarks.


In the event of negotiating an agreement with a manufacturer, there are a few suggestions to consider prior to having both parties sign on the”dotted line. The contract should be written in at least English as well as Chinese to avoid any misunderstandings due to language differences. When the contract is ready for signing, the person signing it from the manufacturer’s party must be a factory owner , or at a minimum an executive manager – not a salesperson, or another factory employee. The contract should then be approved by the factory and then receive its seal of approval, also known as “chops” that is a legally binding act in China.

polycarbonate injection molding ,why?

With the growth of our industries, we are compelled to optimize our production cycles to make our processes more efficient. From raw materials to tooling, we aim for quality and efficiency in a cost-effective manner.

polycarbonate injection molding

As we focus on developments in the plastics industry, there are a number of aspects to consider. The plastic industry has been making huge strides over the past few years. Plastic injection molding is a good example of this. Historically, it dates back to the end of the 19th century. The concept of injection molding was first conceived by John Hyatt and Isaiah Hyatt.

The idea has developed since then to the point of incorporating automation into the cycle.

Injection molding now uses polycarbonate as a raw material. Injection molding of polycarbonate is growing in popularity due to its many benefits.

Polycarbonates: what are they?

Properties and Characteristics of Polycarbonates
PCs are made of a unique combination of chemical and physical properties that make them superior to glass, plastic, and PMMA.

Thermoplastics such as polycarbonate are amorphous and contain carbonate groups. They are tough and have other unique properties. It is relatively easy to mold them. Because of these properties, they are used in many industries.

Strong impact resistance and toughness.
Strong and resistant to impact and fracture, polycarbonates are strong and durable. Computers have a density of 1.2-1.22 grams per cubic centimeter and are indestructible at temperatures up to 140°C.


Polycarbonate is a clear plastic that lets 90% of light pass through. For this reason, they are often used in automotive parts. In addition, polycarbonate sheets can be customized based on your color preferences.


Glass is 6 as heavy as polycarbonates. As a result, it is easier to install and more efficient. Transport costs will also be reduced.

UV protection

The benefit of polycarbonates is that they protect us from UV light. If you come into contact with UV light, you will be 100% safe.

The Nature of Optics

Optical applications are well suited to polycarbonates because of their amorphous nature. Their refractive indices are 1.584 for clear polycarbonates

Resistant to chemicals and heat

A high level of acid and alcohol resistance is found in PCs. Note that PCs are susceptible to reacting with diluted alkali. Cleaning PC parts with alkaline soap is not recommended. Polycarbonates hold up to temperatures up to 135°C.