Compression Molding

Rubber Compression molding

Compression molding is one form of molded silicone rubber parts. Compressing preformed silicone rubber in a mold with a press during the compression process, Silicone rubber is forced into the mold cavity to form the final product during this process, any excess rubber is pushed into the flash and trim gate allowing easy cleanup once the rubber is set.

Compression molding works best for medium hardness compounds in low volume production. Silicone rubber can be difficult to insert into more complex mold designs. And Soft and Hard silicone rubber compounds don’t do well in the compression molding process.

But Silicone rubber compression molding offers advantages over other methods

  • Cost-effective Tooling
  • Maximized cavity count
  • The short set-up time that saves on short production runs
  • Economical process for medium precision
  • the least amount of waste in comparison to other molded rubber processes. 

Compression molding can be a cost-effective solution when:

  • Having silicone rubber industries manufacture the Tooling.
  • the cross-section of the part is very large and requires a long cure time.

Compression molding is used for anything from simple silicone rubber o ring to the most complex silicone parts.

If compression molding isn’t the best fit for your project, Ukong can offer a variety of other molded silicone rubber products through injection or transfer molding.


Injection Molding

Liquid silicone injection molding

Injection molding process involves rapidly injecting an exact amount of Silicone rubber from a tube or cylinder into a closed heated mold, the injection press closes the heated mold and applies pressure to keep the mold closed during the injection and curing cycles, the screw then injects the silicone rubber through the nozzle into the mold. the silicon rubber travels through the mold via a system of runners and sprues and finally enters the mold cavities through a gate, it then fills and packs the cavities to form the desired part rubber.

Injection molding offers economical advantages including:

  • short molding cycle
  • Lower unit cost
  • high dimensional tolerances
  • An absence of flash
  • little scrap or waste.

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Transfer Molding

Rubber transfer molding

Transfer molding combines the advantages of injection molding with the ease of compression molding. the process of transfer molding involves placing a rubber and a chamber at the top of the mold and then pushing through sprues into a heated mold.

Transfer molding offers several advantages over other methods,

  • shorter production cycles
  • maintains close dimensional tolerances than compression molding
  • provides uniformity to the molded products
  • fast mode setup.



Swimming caps are a crucial piece of equipment for swimmers, both amateur and professional. They help to protect hair from the harsh chemicals in pools, reduce drag in the water, and improve the swimmer’s speed and efficiency. When choosing a swimming cap, there are two main options: silicone and latex. Understanding the differences between these two types of caps can help swimmers make an informed decision about which one to choose.

Silicone swimming caps are made from a synthetic material that is soft and durable. They offer several advantages over latex caps. Firstly, they are hypoallergenic, which means they are less likely to cause an allergic reaction. This is particularly important for people with sensitive skin. Secondly, silicone caps are easier to put on and take off than latex caps, as they have a more slippery surface. They also last longer than latex caps and can withstand more wear and tear.

Another advantage of silicone caps is that they offer a comfortable fit. They are soft and stretchy, which means they can mold to the shape of the swimmer’s head without causing discomfort. This is particularly important for swimmers who spend a lot of time in the water, as an ill-fitting cap can cause headaches or other discomforts.

Latex swimming caps, on the other hand, are made from natural rubber. They are stretchy and form-fitting, which means they can provide a tight seal around the head. This tight seal helps to reduce drag in the water, which can improve a swimmer’s speed and efficiency. However, some swimmers may find latex caps to be less comfortable than silicone caps. This is because they can be more difficult to put on and take off, and they can feel tighter on the head.

One disadvantage of latex caps is that they are not as durable as silicone caps. They are more prone to wear and tear, and may not last as long. Additionally, they are not hypoallergenic, which means they can cause skin irritations or allergic reactions in some people.

In summary, the choice between silicone and latex swimming caps comes down to personal preference. Swimmers who value durability, comfort, and hypoallergenic properties may prefer silicone caps. Those who want a tight-fitting cap that reduces drag in the water may prefer latex caps. Ultimately, the choice between the two types of caps depends on the swimmer’s individual needs and preferences.

Swimming is a popular recreational and competitive activity that many people enjoy. Swimmers, whether professional or amateur, know the importance of having the right gear to enhance their performance in the pool. One essential piece of equipment that is often overlooked is the swim cap. A swim cap not only keeps the hair out of the face, but it also helps swimmers to glide more smoothly through the water. In recent years, custom swim caps have become increasingly popular among swimmers.

Custom swim caps come in different types and materials, but one of the most popular is the silicone swim cap. Silicone swim caps are made from a material that is lightweight, durable, and easy to put on and take off. Silicone is also hypoallergenic, making it an excellent option for people with sensitive skin. These swim caps are available in a wide range of colors and designs, making them an attractive option for swimmers who want to show off their style.

One of the advantages of using custom swim caps is that they can be personalized to suit an individual’s preferences. Personalized swimming caps can be printed with the swimmer’s name, team name, or logo, making them a great way to promote team spirit or personal branding. Custom swim caps can also be used to display a motivational message, a quote, or even a favorite image. The possibilities are endless, and the swimmer can create a unique and meaningful cap that reflects their personality and style.

Another benefit of using custom swim caps is that they can help swimmers to stand out in a crowded pool. In competitive swimming, where every second counts, having a distinctive swim cap can make it easier for coaches and teammates to spot their swimmers in the water. Custom swim caps are also great for triathletes who need to quickly locate their gear during a race.

Custom swim caps are not just for individual swimmers or competitive teams. They can also be used for fundraising events, charity swims, and corporate events. Personalized swimming caps can be designed to promote a specific cause or organization, and they can be sold or given away as part of a fundraising campaign. Custom swim caps can also be used as a marketing tool for businesses that want to promote their brand in a unique and memorable way.

In conclusion, custom swim caps are an excellent way to enhance a swimmer’s experience in the pool. They are available in different materials and designs, but silicone swim caps are a popular option because of their durability, comfort, and versatility. Personalized swimming caps can be customized to suit an individual’s preferences, making them a great way to show off style, promote team spirit, or create a memorable marketing campaign. Whether for personal use or for a fundraising event, custom swim caps are a fun and practical way to make a splash in and out of the water.

Baby teether

Silicone Baby Toy, Silicone Teether, and Teething Toy: Everything You Need to Know

As parents, we always want the best for our babies. This is why when it comes to choosing toys for our little ones, safety and quality are our top priorities. One popular option for parents these days is silicone baby toys, particularly silicone teethers and teething toys. In this article, we will explore what silicone baby toys are, their benefits, and how to choose the right ones for your baby.

What are Silicone Baby Toys?

Silicone baby toys are toys made from silicone, a synthetic material that is known for its durability, flexibility, and safety. Silicone is a popular material for baby products because it is free from harmful chemicals, such as BPA, phthalates, and PVC, which can be found in other materials like plastic. Silicone is also easy to clean, non-toxic, and hypoallergenic, making it an excellent option for babies who are teething or have sensitive skin.

Silicone Baby Teether

A silicone baby teether is a toy designed to soothe a baby’s gums and provide relief during the teething process. Teething can be a painful and uncomfortable experience for babies, and a silicone teether can help ease their discomfort. Silicone teethers are soft and chewy, making them perfect for babies to gnaw on. They are also easy to hold, lightweight, and can be shaped into various forms, making them ideal for babies to explore with their hands and mouths.

Benefits of Silicone Teether

Silicone teethers have several benefits, including:

Safe and Non-toxic: Silicone teethers are made from food-grade silicone, which is safe and free from harmful chemicals. This means that babies can chew on them without any risk of exposure to harmful substances.

Durable and Long-lasting: Silicone teethers are durable and can withstand the rigors of baby chewing. They can last for a long time, making them an excellent investment.

Easy to Clean: Silicone teethers are easy to clean, and they don’t retain odors or stains. They can be washed with soap and water or placed in the dishwasher.

Soft and Chewy: Silicone teethers are soft and chewy, making them perfect for babies to gnaw on. They can provide relief for sore gums and help babies through the teething process.

Teething Toy

A teething toy is any toy that is designed to help babies through the teething process. Teething toys can be made from various materials, including silicone, rubber, wood, and fabric. They can come in different shapes, sizes, and textures, and they can be filled with water, gel, or other materials that can be chilled to provide additional relief for sore gums.

How to Choose the Right Silicone Baby Toys and Teething Toys

When choosing silicone baby toys and teething toys, it is important to consider the following factors:

Safety: Look for toys that are made from food-grade silicone and are free from harmful chemicals. Check for any certifications or safety standards that the toy may have.

Durability: Choose toys that are durable and can withstand the rigors of baby chewing. Look for toys that are easy to clean and don’t retain odors or stains.

Size and Shape: Choose toys that are easy for babies to hold and manipulate. Consider the size and shape of the toy and whether it will be easy for your baby to use.

Texture: Look for toys with different textures, as this can provide additional relief for sore gums.


Silicone baby toys, particularly silicone teethers and teething toys, are excellent options for parents looking for safe, durable, and effective toys for their babies. These toys are made from food-grade.

Swimming caps for braids

Swimming caps for braids

Long hair swim cap

There is no better feeling, than that where you feel one with nature simply by being in the water. Swimming is an art, it requires grace and tactic. But grace and tactic cannot stand alone, good gear is essential. A long hair swim cap is designed to grant you the advantage while you’re under water. I mean after all, who want’s hair obscuring a naturally good underwater view?

Long hair swim caps are designed with the intention of including diversity in design. Although this might sound surreal to some, hair, is as diverse in texture and length. Due to this diverse nature of hair, a “one-size fits all” does not suffice. The Long hair swim cap guarantees that each customer’s needs are taken into account.

For this reason, Long hair swim caps can vary in design and structure. The long hair swim cap design can suit women with braids, long hair that might not necessary fit in a traditional swim cap, afro hair, dreadlocks, and different black hair.

Swimming caps for braids

Swimming caps for braids takes into consideration the length and bulk of braids. It’s structured such that the braids can fit inside a large swimming cap and prevent the swimmer from having to deal with soaked heavy braids when they leave the water.

Upholding diversity in the water is not an easy fit. Ukong has strived to ascertain that a swimming hat for long hair is designed such that the women can comfortably engage their favorite sport whether the sport is undertaken for competitive or leisure purposes.

Swimming caps for dreadlocks

There are many black women and girls who have dreadlocks. Our company did not fail to factor in this aspect of hair. A swim cap for dreadlocks ensures that every lock is tucked and protected from moisture.

Swim caps for black hair are structured with the lengths and the feel of the hair in consideration. Black hair can have very diverse textures and may fit differently in a swim cap.

Swimming caps for Afro hair

UKONG Swim caps for afro hair therefore, are strategic in ensuring that each dynamic aspect is accounted for. Thus, whether you rock a set of natural afro, dreadlocks, long hair whether treated or not, and even in instances where you have decided to opt for the more conventional braided look, there is a long hair swim cap designed specifically for you.

Swimming caps for long hair have been long overdue. They are essential innovations as they represent a marginalized group that had never been before factored in in sports. The long hair swim cap addresses diversity.

Swimming hats for long hair that are exceptionally designed by UKONG are diverse. The company integrated a varied color gradient and informed different sizes to the swim caps. This was an intentional choice that was strategic to include swimming caps that were made with a toughened silicone to offer durability.

Each long hair swim cap has a watertight seal that prevents water from seeping through into the hair. Thus, throughout your swimming exercise you’re guaranteed to maintain dry and healthy hair underneath your swim cap regardless of how much rigorous exercises you undertake underwater.


Silicone tubes are often used in industries and applications where heat and electrical conductivity are prominent. Although the third-party test report is the core to confirm the silicone tube has fire-retardant capabilities. There are also some simple test ways and you can test them anywhere. After the combustion test, the fire-retardant silicone tube has a higher ignition point.

We prepare fire-retardant silicone tubing and regular silicone tubes to test the ignition point.

First of all, we need to prepare a stable naked light, it is recommended the alcohol lamp as this is a piece of more reasonable testing equipment, while the lighter test results are not stable, so it is not recommended. The flame-retardant silicone tube and other silicone tubes can be burned on an alcohol lamp at the same time, there are obvious differences from the burning point, and combustion time, after burning.

Ignition Point: Put the flame-retardant silicone tube in the outer flame of the alcohol lamp from 500 to 600 ° (the flame is divided into the outer flame, the inner flame, and the Flame Center) . The ignition point of the flame retardant silicone tube is 50~80s.

and other non-flame-retardant silicone hoses into the outer flame about the 30s will be burning up. This test found that the flame-retardant silicone tube burning point is more than twice, and its instantaneous burning point is as high as 1000 degrees centigrade or above.

At present, the burning temperature of household appliances is basically below 1000 degrees centigrade, so the flame-retardant silicone tube used in daily life is almost not instantaneous combustion.

Flame-retardant silicone tubing has a high ignition point and is difficult to ignite (see below)

Other silicone tubes have a low ignition point and will ignite or even expand the flame when exposed to an open flame, accompanied by smoke (see below)

Combustion time: ordinary silicone tube in the combustion will accelerate and expand the height of the flame and combustion area, is not flame retardant effect which is the same as other ordinary silicone materials, after removing it from the ignition source, the ordinary silicone tube will burn on its own for a period of time about the 20s, and in the silica gel pipe ashes can be found after the sporadic flame and then extinguished. Through the in-kind combustion test, it can be clearly observed that the flame-retardant silicone tube will not spread and enlarge the flame after it is ignited by an open flame, it can extinguish itself within 3s when it is removed from the fire source. No Flame and no spark ash will appear, so it can extinguish the scattered flame automatically.

The flame-retardant silicone tube will not burn even when it is ignited and will self-extinguish when the ignition source is removed.

For other ordinary silicone tubes, the height and width of the fire source will be enlarged after the burning of other silicone tubes

After burning: extruding silicone products will appear white solid powder after burning, after burning, the inner temperature of the ordinary silicone tube will be higher, and even there will be sparks that can not be put out quickly. It needs to be completely extinguished in a few seconds. Therefore, the ordinary silicone tube can not play the role of flame-retardant in household appliances. While the flame-retardant silicone tube can effectively control the speed of flame diffusion and good self-extinguishing effect.

As the silicone itself is a relatively high burning point compared to other materials, even ordinary silicone tubing is superior to other materials in terms of both burning speed and burning point, the flame-retardant silicone tube is a special silicone material specially developed for the purpose of protecting against combustion, and its effect is obvious to all.

Silicone tube

There are many simple ways to treat the dust surface of silicone tubes. The simplest way is to put the silicone hose lying flat in a clean environment with the circulation of air to weaken the adsorption value, the longer the silicone tube is placed, the weaker the adsorption capacity, which is why for a period of silicone hose dust-free, while the new silicone rubber tubing is on the side of the dust-suction.

Therefore, for manufacturers, the storage environment requirements for silicone tubes are quite strict, no matter from any process of silicone, we should avoid sticky dust. Once the adhesion of too much dust will seriously affect the quality and delivery efficiency, so if the silicone tube which has been covered with dust, must be cleaned.

Dust treatment method one: Alcohol Wipe is one of the more extensive methods, the advantage is affordable and easy to operate. The silicone hose pipe surface after an alcohol wipe will be much cleaner, but at the same time, alcohol will stimulate the adsorption value of silicone and lead to the silicone sticky dust speeding up again. so it is suggested that after wiping with alcohol, it needs to be quickly packed into a clean and sealed environment, for example, PE bags, cartons, etc., Do not re-exposed to dust environment. And alcohol is one of the dangerous chemicals that need professional training before the user can use it.

Method two: Wipe with white gas. white gas in compression molding, liquid silicone rubber injection process is used frequently. the advantage is that white gas cleaning ability is very strong, especially for silicone products, a small drop of white gas is excellent when wiped with an absorbent cotton cloth. However, it should be noted that white electric oil has certain corrosion properties but is quickly dried by air, therefore, the operator needs to wear gloves when using white electric oil to wipe the dust on the surface of the soft silicone tubing, and can not wipe the silica gel tube for a long time because it will corrode the surface of the silica gel tube and lead to the increase of the positive and negative tolerances of the product size. So we should wipe and dry the silicone tube using white electric oil.

Method three: Just Place in water. after the dusty silicone tube cooled down, put it into the clean water and add a small amount of bleach, a few minutes later, we can directly wipe it. The advantage of this method is that it is easy to operate and does not have extra cost. Most important, the silicone tube should be cooled down completely,  otherwise, it will cause the product tolerance reduction to the lower limit. As it needs extra time to dry the silicone tubing by mechanical or natural air-drying, it will affect the product delivery.

Method four:  with Matt surface. The glossy product has a strong adsorption value, while the matt surface is not. The matt surface touches rough, the advantage is that these rough surfaces effectively insulate the enhanced adsorption value, but the glossy surface looks more shiny and beautiful.

Method Five: Coating with anti-dust oil. This is the best way to protect silicone tubes from dust, and after coating the surface touch smoothly.  But it is difficult to spay even as the silicone tube is circular, which leads to the coating cost being expensive. and the coating is not environmental.

Method Six: Quickly air-dry. silicone pipe dust absorption mainly occurs in the product which has residual heat. Quickly air-dry is suitable for the products which have to be second vulcanized, such as food-grade and medical silicone tubes. It is also suitable for regular silicone products. We can use high-power electric fans to speed up the cooling, then the dust adsorption ability of the silicone tube is weakened.