Rubber grommets are one of the most common types of grommets and are used across a wide range of industrial applications. Due to their many advantages, various industries use rubber grommets in all kinds of equipment, ranging from vehicles to consumer electronics and more. Here, we will discuss rubber grommets as well as their many benefits and applications.

What Is a Rubber Grommet?

Rubber grommets are used in various manufacturing and electrical engineering applications to cover sharp edges. Also known as insulating bushings, edging, bushings, or eyelets, rubber grommets are typically black in color and can be used for various purposes, including:

• Protecting wires. Rubber grommetsare waterproof and dustproof, and they can protect wires from being easily cut by sharp plates and edges.
• Strain relief.Rubber grommets can provide strain relief by gripping wires in place and minimizing any damage or disruptions that happen if the cable or cord is accidentally pulled.
• Aesthetic purposes.Rubber grommets can enhance the appearance of a drilled or punched

What Are the Benefits of Rubber Grommets?

Rubber grommets offer various benefits that make them an ideal solution for numerous applications. Not only do they protect wires and cables from sharp edges but also from the effects of vibration. Other benefits include:

• Various size options.Rubber grommets come in hundreds of stocked sizes to accommodate varied hole sizes and panel thicknesses.
• Water-resistant.Rubber grommets offer excellent water-resistant characteristics and are capable of withstanding organic acids and most modern chemicals.
• Durability and versatility. The durable and resistive properties of rubber grommetsmake them suitable for a range of industries that may come into contact with harsh conditions. They are built to be long-lasting and won’t come loose as easily as other grommet types.
• Material choices.Depending on the environment in which the rubber grommets will be used, they are available in several material options, including SBR, Buna-N, EPDM, silicone, Viton, and neoprene.

Rubber Grommets from NewayRubber grommets have uses across a wide spectrum of applications due to their ability to protect wires, prevent the intrusion of dust and water, and provide an aesthetically pleasing solution for covering sharp edges. At Neway, we offer a selection of rubber grommets in various sizes to fit your needs and save you time and money. We can help you determine the ideal material choice and can even provide a custom solution if you can’t find the part you is looking for. For more information about our rubber grommet capabilities, contact Neway.

VDI Surface Finish – is a scale often used by German machine manufacturers and quite widely used in Spark and Wire Erosion (Verein Deutscher Ingenieure, the Society of German Engineers)

RA is calculated by an algorithm that measures the average length between the peaks and valleys and the deviation from the mean line on the entire surface within the sampling length. Ra averages all peaks and valleys of the roughness profile and then neutralizes the few outlying points so that the extreme points have no significant impact on the final results.

RT is calculated by measuring the vertical distance from the highest peak to the lowest valley within five sampling lengths, then averaging these distances. Rz averages only the five highest peaks and the five deepest valleys—therefore, extremes have a much greater influence on the final value.”

SPI Surface Finish Standards

The SPI is that Society of the Plastics Industry  sets standard for plastics industry in the United States that identifies the cosmetic quality of plastics, NEWAY uses  the SPI standard to define finish of plastic injection molded parts.
There are twelve grades of finishes specified by the SPI in four categories that range from A1 12 to D3 . The card comes with notes of DIAMOND, Grift paper, STONE , DRY BLAST GLASS BEAD and OXIDE for each SPI-SPE number.

Characteristics:

Excellent weather resistance, able to withstand environmental factors such as UV radiation, high temperature, and humidity.

High impact resistance, strength, and rigidity.

Good chemical resistance, able to withstand corrosion from acids and alkalis.

Can be dyed and surface coating, with a wide range of color options.

Can be processed through injection molding, extrusion molding, and other methods.

Applications:

Building industry: ASA material is widely used in the building industry, mainly for the production of roofing, doors, and windows. Its excellent weather resistance enables it to be used outdoors for a long time without damage.

Automotive industry: ASA material can be used for the production of exterior components for automobiles, such as roofs, side shells, mirrors, and lights. Its weather resistance ensures that these components do not deform or fade when exposed to outdoor environments for a long time.

Home appliances: ASA material can also be used for the external components of home appliances, such as TV shells and air conditioner shells. Its good weather resistance and color options can meet consumers’ personalized needs.

Other industries: ASA material can also be used for the manufacture of amusement equipment, outdoor furniture, sports equipment, and other products.

Cold running is a process for producing plastic parts in which plastic material is injected into a mold at room temperature. which is great for creating precise and intricate shapes Hot running is a process for producing plastic parts in which a heated plastic material is injected into a mold, it is better for applications requiring higher strength and stiffness.

What are the advantages and disadvantages of Cold and hot running for plastic parts?

Cold running is a process that is used to form plastic parts at room temperature. It is a cost-effective way of producing parts that have complex geometries and shapes. Cold running is often used to produce parts that are thin-walled, highly detailed, and require tight tolerances. The process is also suitable for producing parts that require a smooth surface finish. The main advantage of cold running is that it is a fast and economical process. Another benefit is that it is a clean process and does not require the use of any cutting fluids.

Hot running is a process that is used to form plastic parts at high temperatures. This process is used for parts that require greater strength and superior dimensional accuracy. Hot running is also used for parts that require a glossy finish or have intricate details. The main advantage of hot running is that it produces parts that have high strength, superior dimensional accuracy, and a glossy finish. The main disadvantage of hot running is that it is a more expensive process than cold running and requires more setup time.

Reinforcing Agents: including glass fiber (GF), carbon fiber (CF), nanoparticles, etc., which can improve the strength, stiffness, and heat resistance of PP.

Flame Retardants: such as aluminum hydroxide, magnesium hydroxide, etc., which can improve the flame retardant performance of PP.

Fillers: such as talc, calcium oxide, calcium silicate, etc., which can reduce the cost of PP and improve its physical properties.

Functional additives: such as antioxidants, UV absorbers, light stabilizers, lubricants, etc., which can improve the service life and stability of PP.

Elastomer toughening agents: such as EPDM, SBS, SEBS, etc., which can improve the toughness and impact strength of PP.

Weathering agents: such as silane coupling agents, organic titanium, etc., which can improve the weather resistance and anti-aging performance of PP.

Reflective agents: such as micro glass beads, metal films, etc., which can improve the reflective performance of PP, and are widely used in traffic safety facilities, protective equipment, and other fields.

Different PP modified materials should be selected according to specific usage scenarios and requirements.

From simple o-rings to complex parts, Neway offers a wide range of silicone sealing solutions and sophisticated processing capabilities to deliver a quality product every time. Find out if silicone o-rings are right for your application from our four key facts below.

1. Offers Excellent Resistance Properties
Silicone o-rings are widely sought after for their outstanding resistance properties to a wide range of chemicals, temperatures, and weather conditions. Specifically, silicone is known to feature:

Extreme temperature resistance from -155°F to 400°F
Superior insulating properties
Exceptional weather resistance to UV light, ozone, water, oxygen, moisture, and steam
Outstanding aging characteristics
Chemical resistance to oxidizing chemicals, some acids, ammonia, and isopropyl alcohol
2. Various Types and Forms of Silicone
Silicone can be formulated in various types—each providing different working properties that are key in specific environments. These types include:

Dimethyl Silicone: ASTM D1418 Designation VMQ. Used in general silicone applications
Phenyl Silicone: ASTM D1418 Designation PVMQ. Used in low temperature applications
Fluoro silicone: ASTM D1418 Designation FVMQ. Offers oil resistance properties
Liquid Silicone Rubber (LSR): ASTM D1418 Designation VMQ. Used in injection molding
In addition to multiple types of silicone, it also comes in many forms. High Consistency (HC) silicone is used in compression, transfer, and rubber injection, while LSR silicones are injection molded.

3. Can be formulated to Meet Your Needs
Every silicone seal can be formulated to meet specific requirements, such as color, temperature ranges, insulation, and more. Depending on the application, silicone seals can be transformed for highly specific functions:

Silicone can insulate or be conductive
Withstand freezing temperatures and handle extreme heat
Can be almost any color, including translucent or glow-in-the-dark
Resists fungus and is non-toxic
Based on the excellent range of working properties, silicone is used in many applications in which organic rubber cannot perform.

4. Superior in Medical Applications
Silicone o-rings are available in FDA approved and medical compliant grades. Because of silicone’s non-toxic biocompatibility, it has become a key material for medical seals and devices. As medical technology continues to become smaller and more compact, micro miniature silicone seals are becoming increasingly popular.

Silicone seals play an important role in the medical industry and are used in many life-saving applications, including:
Ventilators
Medical pumps
IV components
Feeding devices
Implant materials
Want to learn more about silicone o-rings?
Contact an engineer today.

Two Types of Tending: Manually and Automatically Trimmed Gates
There are two types of gates that are used in plastic injection molding: manually trimmed and automatically trimmed gates. With manually trimmed gates, an operator must separate the parts from the runners after every cycle. Manually trimmed gates are used when the material used for the part must not be exposed to the forces of automatic shearing or when the gate is too thick to be separated automatically.
With automatically trimmed gates, no human intervention is needed to separate parts from runners. When the tool opens to eject the part, it is automatically sheared from the runner. Robots and other automation equipment used with automatic trimming can also reduce scratching and labor content.  This also eliminates the need for manual separating as an additional operation and ensures that cycle times remain constant.

Common Plastic Gate Designs
While gates come in a wide range of designs, four of the most commonly used are:
Edge Gate. Probably the most common gate design, it is best suited for flat parts and is located (not surprisingly) on the edge of the part. Edge gates work well with medium and thick sections, and can be used on multicavity two-plate tools. They leave a scar at the parting line.

Sub Gate. This design is the only automatically trimmed gate on the list, and it requires ejector pins. A very common gate, it has a number of variations, some with memorable names like the smiley gate and the banana gate, as well as the tunnel gate. Sub gates can be used away from the parting line, giving you great flexibility in placement. They leave a very small scar on parts.
Direct or Sprue Gate. This manually trimmed gate is used to produce symmetrical filling of single cavity molds for large cylindrical parts. Easy to design and with low maintenance costs, it produces parts that are typically lower stressed and high strength. This gate leaves a significant scar at the point of contact.

Hot Tip Gate. Typically located at the top of a part as opposed to the parting line, this type of gate is great for conical or round shapes that require uniform flow. This type of gate requires a heated element to deliver hot material directly to the part, but it can improve flow and reduce cycle times. It leaves a small raised spot on the surface of the part.

Gate design is a critical component of the injection molding design process. Accessing the variables like part/mold design, material selection, and production intentions are important considerations when deciding what gate design is right for the job. In our more than two decades in plastic injection molding, we’ve seen gate designs that produced outstanding parts and others that required a trip back to the drawing board. As a result, we have significant expertise in this area and can provide tremendous insight on your mold design. We hope this serves as a core understanding or gating and what options are available.