Alexei Volkov
The thickness of plastic is usually measured in mils, which is the thickness of the sheet in thousandths of an inch. However, in the context of 28 pt plastic, the thickness is likely referring to points (Pt), which is a unit of measurement commonly used for paper thickness. According to a conversion table, 28 pt corresponds to approximately 0.711 mm or 0.028 inches. This thickness is often used for paper products such as book covers, business cards, and invitations, where the thickness and durability of the paper are important for the desired look and feel of the final product.
| Characteristics | Values |
|---|---|
| Thickness | 0.711 mm or 0.0279 inches |
| Comparison to other paper thicknesses | Thicker than 12 pt. cardstock and 24 pt. cardstock |
| Use cases | Premium invitations, business cards, bookmarks, brochures, luxury business cards, laminated flyers, leaflets, etc. |
| Sustainability | Lighter Pt. paper stocks are more sustainable as they require less wood pulp and produce less waste. |
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What You'll Learn
28 PT plastic is 0.711mm thick
The thickness of plastic sheeting is usually measured in units called mils, which are equal to 0.001 inches or one-thousandth of an inch. However, in the context of paper thickness, the term "PT" is commonly used to denote points, which also represent thousandths of an inch. Thus, when referring to 28 PT plastic, it is understood to be 0.711mm thick.
To put this into context, a standard sheet of paper is approximately 0.1mm thick, making 28 PT plastic nearly seven times thicker. This thickness measurement is commonly associated with paper products, such as book covers, business cards, and invitations, where the thickness of the material contributes to the overall durability and tactile experience.
In the realm of plastic sheeting, the thickness of 0.711mm falls within a range suitable for various applications. For instance, plastic sheeting used in landfills as geomembranes requires greater thickness to withstand rugged conditions. On the other hand, certain applications, such as plastic film exposed to sunlight, may require additional additives like UV inhibitors to enhance durability, despite having a thinner gauge.
The thickness of 28 PT plastic, or 0.711mm, offers a balance between flexibility and sturdiness. This thickness is often chosen for projects that require a combination of durability and ease of manipulation. It is important to note that the thickness of plastic sheeting can vary based on specific requirements, and the additives or reinforcements included in the plastic composition also play a significant role in its overall performance.
While the thickness of 28 PT plastic is specified as 0.711mm, it is worth mentioning that the plastic industry allows for a certain level of variance. It is generally accepted that plastic sheeting can deviate by +/-10% from the stated thickness, meaning a 28 PT plastic sheet could fall within a range of approximately 0.64mm to 0.78mm while still being classified as 28 PT. This tolerance accounts for potential fluctuations during the manufacturing process and ensures that the product meets functional requirements without being overly restrictive.
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Thickness is measured in microns, mils, or gauge
Thickness is a critical factor in determining the durability, perception, and visual appeal of materials such as plastic and paper. While the thickness of plastic is often expressed in microns, mils, or gauge, paper thickness is commonly measured in points (pt) or pounds (lb).
Microns, Mils, and Gauge:
Microns, mils, and gauge are units used to measure the thickness of materials, particularly plastic. A micron, denoted as 'µ', is one-thousandth of a millimetre (0.001 mm). This unit is often used in the plastic sheeting industry to express the thickness of plastic gauge. For instance, a 6-mil plastic sheeting will measure 6 mils thick by a micrometer.
The term 'mil' is commonly used to describe the thickness of packaging materials, tapes, and gloves. One mil is equivalent to 0.001 inches or 0.0254 millimetres. To convert mils to microns, multiply the value in mils by 25.4.
Gauge is another unit used to measure thickness, particularly in the context of plastic stretch film. It is equal to one-hundred-thousandth of an inch, making it 100 times the measurement in mils and approximately four times the measurement in microns. For example, a stretch film with a thickness of 0.5 mils is equivalent to 50 gauge.
Points (pt):
Points (pt) is a measurement unit commonly used to describe the thickness of paper in thousandths of an inch. For example, 12 pt paper has a thickness of 0.012 inches, making it a durable option for items like business cards. Lower pt values, such as 5.8 or 6 pt, offer economic and environmental benefits due to reduced material usage and improved sustainability in logistics. On the other hand, higher pt papers tend to be thicker and more durable, making them suitable for projects requiring long-lasting, high-quality prints.
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Plastic sheeting can be made to a multitude of thicknesses
Plastic sheeting is a versatile material that can be made to a wide range of thicknesses, each suitable for a variety of applications. The thickness of plastic sheeting is typically measured in mils, which is equivalent to one-thousandth of an inch. For example, a 6 mil plastic sheet is thicker than a 4 mil plastic sheet, with a thickness of 0.006 inches (by dividing the mil value by 1000).
Plastic sheeting can be as thin as 1 mil, which is commonly used for a grocery store plastic bag, or as thick as 120 mils. Different applications require different thicknesses of plastic sheeting. For instance, thinner sheets (2 mil) are ideal for light-duty tasks such as covering furniture during painting, while thicker sheets (6 mil or more) are often used for heavy-duty tasks like vapor barriers and crawl space encapsulation.
In certain cases, a highly durable liner designed to last a lifetime may be required, while in other scenarios, a temporary cover can suffice with a thinner plastic sheet. The thickness of plastic sheeting also depends on its intended use. For example, a vapor barrier must be a minimum of 6 mils, whereas the EPA requires hazardous waste HDPE liners to be a minimum of 60 mils.
The durability of plastic sheeting is not solely dependent on its thickness. Reinforced plastic sheeting with scrim adds resistance against punctures and rips, and plastic sheeting density is another factor to consider. Additionally, the type of polyethylene used can impact the heat resistance and flexibility of the plastic sheeting. High-density polyethylene (HDPE) sheeting is more heat-resistant than low-density polyethylene (LDPE) and performs well under direct UV exposure, but it is more rigid and susceptible to cracking during installation.
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True thickness is when a film measures its stated thickness
The thickness of plastic sheeting can be engineered to suit a variety of applications. For instance, plastic sheeting used in landfills needs to be stronger and thicker than plastic used for other applications. The thickness of plastic is typically expressed in microns, with 1 micron (1μ) equalling 1/1000 mm.
The term "true thickness" in the plastic sheeting industry refers to a film that measures its stated thickness. For example, a film that is labelled as 6 mils thick will measure 6 mils by a micrometer. It is common knowledge in the industry that most films have a +/-10% variance, so a 6 mil film can measure 5.4 mils and still be considered 6 mils.
Reinforced films that have strings running through them are often measured at their thickest point, where the reinforcement crosses. These films can be as thin as 3 mils between the reinforcement grid but are sold as 6 mil films. There are some films that are "true" 6 mil films, such as PolyScrim 6 and Anti-Static Fire Retardant 6 mil.
The thickness of plastic films can be measured using thickness gauges, such as those manufactured by SolveTech, which are precise, non-contact thickness gauges for measuring plastic film, nonwovens, and other materials. These gauges can be used in laboratories or on production lines and provide accurate measurements to ensure product quality and consistency.
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Thicker plastic is usually stronger
Thicker plastic is generally stronger, and there are several reasons for this. Firstly, the polymer molecule chain length influences the strength of plastic; longer molecules tend to result in stronger plastics. Thicker plastics can accommodate longer polymer chains, thus increasing their strength.
Secondly, additives can be incorporated into thicker plastic to enhance its strength and durability. These additives may include glass fibre, carbon fibre, or nylon fibre, which significantly improve the durability of the plastic. However, these additives also increase production costs and cause additional wear on the moulds used to create the plastic parts.
Additionally, thicker plastic parts often feel more rugged and durable due to their increased thickness. This is particularly important for products that require a sturdy and robust feel, such as high-touch items like business cards or custom bookmarks.
The thickness of plastic is measured in a variety of units, including points (pt), mils, and micrometers (µm). 28pt plastic, as referenced in your query, equates to 0.711mm in thickness. This thickness falls within the range of thicknesses achievable with PVC plastic, which can be manufactured from 200 microns (0.2mm) to 5mm in thickness.
It is worth noting that while thicker plastic generally equates to stronger plastic, there are other factors that contribute to the strength of plastic. These include the purity of the base resin, the presence of contaminants, and the design of the plastic part. For instance, thinner walls with minimal supports can give plastic a cheap and flimsy feel, whereas thicker plastic with well-designed supports can enhance its perceived quality.
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Frequently asked questions
28 pt plastic is 0.711mm thick.
The thickness of plastic sheeting is measured in units called mils, which are equal to 0.001 inch or about the same thickness as a human hair.
The most common thickness used is 6 mils or 0.006 inches.
"True" means that a film that is labelled as having a certain thickness, such as 6 mils, will measure at that exact thickness by a micrometer.
Generally, the thicker the plastic sheeting, the stronger it is. However, the composition of the plastic, including any additives, can also impact its strength.
