Sofia Martinez
Plastic spacers are used in a variety of applications, from electronics to construction. They are small, hollow tubes that create and maintain space between connected parts. Plastic spacers are often used to support and position components within PCB assemblies, but they can also be used as glides, bearings, bushings, and rollers. In addition, plastic spacers are a low-cost solution for reinforced concrete construction, helping to secure steel bars within cast assemblies. While plastic spacers offer many advantages, such as corrosion resistance and electrical insulation, they may not be suitable for all applications due to their potential incompatibility with certain materials and susceptibility to corrosion from chlorides and chemicals.
| Characteristics | Values |
|---|---|
| Used in | Bikes, electronics, construction, automotive, machinery, assemblies, concrete structures |
| Function | Lengthen the space between connected parts, support and position components, secure and electrically connect components, maintain space between fastened parts, secure steel bars within cast assemblies |
| Advantages | Low-cost production, fast processing, lightweight, corrosion-resistant, chemical-resistant, resistant to UV radiation, versatile, electrical insulation, resistant to extreme temperatures |
| Disadvantages | Susceptible to corrosion when in contact with chlorides and chemicals, may melt at high temperatures, may not bond well with concrete |
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What You'll Learn
- Plastic spacers are used to secure steel bars in reinforced concrete structures
- Plastic spacers are used in bicycles to guide the positioning of the stem
- Plastic spacers are used in PCB assemblies to support and electrically connect components
- Plastic spacers are used to lengthen the space between connected parts in machinery
- Plastic spacers are used in construction to provide electrical insulation
Plastic spacers are used to secure steel bars in reinforced concrete structures
Plastic spacers are essential in concrete construction to ensure that steel reinforcing bars (rebar) remain in the correct position before and after concrete is poured. They are short, rod-like devices that secure the rebar within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured and remain within the structure.
Plastic spacers are designed for durability and are typically intended for single-use to ensure maximum performance and integrity. Plastic spacers offer several advantages: they are resistant to corrosion, lightweight, and easy to install, which saves time and labour costs. They are also low-cost and fast to process.
However, plastic spacers do not bond well with concrete and are not compatible materials. Plastic has mechanical properties (it holds the bar in position) but no structural properties, and is a foreign element within the construction. When the concrete is poured, a small gap is created between the concrete and the plastic. This gap can lead to a disconnection between the spacers and the concrete, providing a pathway for corrosive substances to access the steel reinforcement.
Despite this drawback, plastic spacers are essential components in reinforced concrete structures. They play a pivotal role in maintaining the structural integrity of concrete constructions by securing steel reinforcements in the correct position within the formwork to prevent movement prior to and during concreting.
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Plastic spacers are used in bicycles to guide the positioning of the stem
Spacers above the stem allow the top cap to compress the bearings. Without spacers, the top cap would bottom out on the fork when tightened. Having spacers above the stem also preserves the length of the steer tube and allows for the option to raise the stem in the future by repositioning the spacers below the stem. Most fork manufacturers advise a maximum limit of 30mm of spacers below the stem, while 5-10mm above is considered aesthetically pleasing.
Some manufacturers of forks with carbon steerer tubes recommend allowing for a 5mm spacer above the stem to ensure the stem has the maximum area to dissipate the clamping force. If the steerer is carbon, it is important to ensure the expansion plug is long enough to reach from the top of the steerer to below the bottom edge of the stem. If the plug is too short, riding with too many spacers above the stem can be dangerous as the steerer could break.
While plastic spacers are commonly used, some riders prefer alloy or metal spacers as they are stronger and cheaper alternatives.
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Plastic spacers are used in PCB assemblies to support and electrically connect components
There are various types of plastic spacers available, including snap-fit, snap-lock, vibration-damping, pivoting, spring-loaded, and releasable plastic PCB spacers. The choice of spacer depends on the specific application and environment in which it will be used. For example, if drilling into the chassis or enclosure is not possible, PCB pillars, a type of spacer, can be used.
Plastic spacers can be made from materials such as nylon 6/6, heat-stabilized nylon 6/6, PVC, Polyoxymethylene (POM), and polystyrene (PS). Nylon is chemical-resistant but should be avoided in damp and humid environments as it absorbs moisture over time. Heat-stabilized nylon 6/6 improves thermal properties and maintains mechanical properties at temperatures up to 257˚F. PS offers good thermal and electrical insulation, while PVC provides excellent electrical insulation and chemical resistance.
Plastic spacers can be installed by hand and do not require assembly equipment. They are suitable for a wide range of applications and provide sturdy, insulated spacing for high-power electronic applications.
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Plastic spacers are used to lengthen the space between connected parts in machinery
Nylon spacers, a type of plastic spacer, are used to lengthen the space between connected parts. They function as glides, bearings, bushings, and rollers. Nylon spacers are highly durable and resistant to cracks and corrosion. They are ideal for insulating against moisture and electricity due to their non-conductive properties. Nylon spacers can be used across many outdoor and indoor applications in various industries, including electronics, construction, and automotive.
Plastic spacers are also used in concrete construction as rebar spacers to secure steel reinforcing bars within cast assemblies. They are a low-cost, fast solution that is easily laid on formworks. However, plastic spacers are not compatible with concrete due to their different thermal expansion and contraction properties. When subjected to temperature variations, the plastic continues to expand and contract, creating a gap between the concrete and the plastic.
In some applications, plastic spacers are used for aesthetic and mildly supportive purposes. For example, plastic stem spacers on bicycles are not load-bearing but guide the positioning of the stem. Plastic spacers can also be used in weight-sensitive applications due to their excellent strength-to-weight ratio.
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Plastic spacers are used in construction to provide electrical insulation
Plastic spacers are also used in concrete construction as rebar spacers to secure steel bars within cast assemblies. Plastic spacers offer a classic, fast, and low-cost solution for construction. They are manufactured from polymers and are easily laid on form-works. However, plastic spacers are not compatible with concrete due to their different thermal expansion and contraction properties. When subjected to temperature changes, plastic continues to expand and contract at a higher rate compared to concrete, leading to a disconnection between the two materials.
In terms of electrical insulation, plastic spacers made of nylon are commonly used across various industries, including electronics, construction, and automotive. Nylon spacers provide excellent resistance to cracks and corrosion, as well as insulation against moisture and electricity. They are also lightweight, chemically resistant, and resistant to UV radiation.
Plastic spacers can also be found in bicycle construction, where they are used for positioning the stem and loading the headset bearings. These spacers are not load-bearing and are mostly aesthetic or mildly supportive.
Overall, plastic spacers play an important role in construction by providing electrical insulation, positioning components, and facilitating assembly processes.
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Frequently asked questions
Plastic spacers are used to lengthen the space between connected parts. They are typically small, hollow tubes that create a clearance gap between two surfaces.
Plastic spacers are used to support and electrically connect components within assemblies. They are also used to position components precisely.
Plastic spacers are corrosion-resistant, lightweight, and have excellent strength-to-weight ratios. They are also versatile, as plastic can be moulded into various shapes and sizes.
Plastic spacers are not suitable for use with concrete due to their different thermal expansion and contraction properties. They are also not suitable for applications with high humidity as they tend to absorb moisture over time.
