7 best lab watch glasses
Lab watch glasses are a type of laboratory glassware commonly used in scientific and industrial settings. These shallow, flat, and circular pieces of glass serve various purposes and are an essential part of laboratory equipment. Here is what you should know about lab watch glasses:
Design and Material:
- Shape: Watch glasses are typically circular with a flat or slightly concave shape. The flat surface and curved edges make them suitable for a variety of applications.
- Material: They are commonly made from high-quality borosilicate glass, which is known for its durability, resistance to thermal shock, and chemical inertness. This makes them suitable for use with a wide range of chemicals and temperatures.
Uses:
- Covering Beakers and Erlenmeyer Flasks: One of the primary uses of lab watch glasses is to cover open containers like beakers and Erlenmeyer flasks. This serves several purposes:
- Prevents contamination of the contents.
- Reduces evaporation, which helps maintain the concentration of solutions.
- Protects against spills and splashes.
- Evaporation and Drying: Watch glasses can be used to promote the controlled evaporation of liquids from a sample. Placing a watch glass over a beaker or petri dish allows for slow, controlled drying of a substance.
- Weighing: They can also be used in analytical balance operations for weighing small samples.
- Crystallization: Watch glasses are used for crystallization processes, allowing crystals to form and be easily observed.
- Cover for Samples: In microbiology and other lab applications, watch glasses are used as covers for samples on microscope slides or petri dishes.
- Covering Beakers and Erlenmeyer Flasks: One of the primary uses of lab watch glasses is to cover open containers like beakers and Erlenmeyer flasks. This serves several purposes:
Sizes:
- Lab watch glasses come in various sizes, ranging from a few centimeters to larger diameters, to accommodate different containers and applications.
Cleaning and Maintenance:
- To ensure accurate and reliable results, watch glasses should be cleaned and sterilized before use.
- They can be cleaned using standard laboratory glassware cleaning techniques, such as washing with soap and water, followed by rinsing and drying.
Safety Precautions:
- When using watch glasses in applications involving heating or potentially hazardous materials, appropriate safety measures and personal protective equipment should be employed.
In summary, lab watch glasses are essential pieces of glassware used in laboratories and industrial settings.They have a wide range of applications, including covering containers, promoting controlled evaporation, facilitating crystallization, and acting as sample covers. Their durability and chemical resistance make them suitable for use with various chemicals and in different laboratory processes. Proper care and maintenance are crucial to ensure their effectiveness and longevity.
Below you can find our editor's choice of the best lab watch glasses on the market
Syracuse Watch Glass, Plain, 2 5/8 in
Carolina Biological Supply Company
Product description
Grooved for stacking, with smooth edges. Size, 2 5/8" diam.
- Grooved for stacking, with smooth edges
- Size, 2 5/8" diam.
- From our beginnings in 1927, Carolina Biological Supply Company has grown to become a leading supplier of science teaching materials for all levels of education. Today, from our headquarters in Burlington, North Carolina, we serve customers worldwide, including teachers, professors, homeschool educators, hobbyists, and professionals in health and science-related fields.
- When you shop with Carolina, you're not alone! All of our products are backed by unparalleled technical support, available from 8am to 8pm, ET, Monday-Friday. Contact information (Live Chat, email, and phone) is provided after placing your order at Amazon.
User questions & answers
| Question: | How tall is it |
| Answer: | No, it's a soft rubber/plastic sole with a fabric footbed and fabric upper. My toddler wears these for waterplay. They absorb a little water, but they are dry in the morning when hung up to dry in a dehumidified basement overnight. |
| Question: | Is the closed side flat, concave, or convex |
| Answer: | It come to the top of the Achilles’ tendon. I loved these shoes and have actually gone through 2 pair! Definitely does not disappoint, they also wash up great in the washing machine! |
Scicalife Watch Glass Beaker Cover Set, 4 Pcs Lab Watch Glasses in 60mm, 75mm, 90mm, 100mm for Laboratory, Science and Chemical Experiment
Scicalife
Product description
Description
-Color: Transparent
-Material: Glass
-Size: About 10x10x1cm / 3.93x3.93x0.39in
Package Including
4 x Watch glasses
- Brand new: high-quality glass, so you can use it with confidence.
- High transparency, easy to observe experimental result.
- The price is favorable and the service life is long.
- Strong durability and corrosion resistance.
- Multifunctional: can be used as an evaporating dish, can be used as a lid, can be used as a container, can be used as a carrier
ULTECHNOVO Watch Glass Lab Watch Glass Beaker Ordinary for School Lab Chemistry Class 4pcs
ULTECHNOVO
Product description
Description
Are you looking for a high quality watch glass? Our product can satisfy all your needs. Thicken glass give you more safety,you can use it with confidence. Don' t hesitate! Come and buy it.
Features
-Color: Transparent
-Material: Glass
-Size: About 10x10x1cm / 3.93x3.93x0.39in
Package Including
4 x Watch glasses
60mm+75mm+90mm+100mm
- Brand new: high-quality glass, so you can use it with confidence.
- High transparency, easy to observe experimental results.
- The price is favorable and the service life is long.
- Strong durability and corrosion resistance.
- Multifunctional: can be used as an evaporating dish, can be used as a lid, can be used as a container, can be used as a carrier
12PK Watch Glasses, 2" (5cm) - Cover Lids for Beakers & Flasks - Evaporation Dish - Polished with Ground Edges - Eisco Labs
Eisco
- STURDY GLASS || Concave beaker covers (also known as watch glasses) made with quality glass. Each cover features ground edges & polished surfaces for safe handling. The 2.0mm glass thick construction resists shattering
- 12 PACK || Set includes twelve covers, each measuring 2" (5cm) in diameter
- VARIETY OF USES || Can be used for a variety of laboratory functions - ideal for covering beakers and flasks, but can also be used to hold small samples for observation under a low powered microscope, or evaporating liquids off of samples (i.e. growing seed crystals)
- GREAT FOR SCIENCE CLASSROOMS || The sturdy construction and makes these covers an excellent choice for science classrooms
- MANUFACTURED BY EISCO LABS || Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind
User questions & answers
| Question: | What is the smallest to largest Beakers will it cover |
| Answer: | It is 17.3 mm tall |
| Question: | Are these heat resistant |
| Answer: | Flat |
| Question: | Are these borosilicate |
| Answer: | There is a size chart under the photo where the description is located that’s what I used it breaks it down for baby months so the s,md, lg ect. (: |
| Question: | Could someone give me an approximate mass on the watch glass covers with 5 cm diameter |
| Answer: | I don't know the width of the shoe but my son has a wide foot and there is plenty of room for him. There is certainly room for a wide foot child and even if they didn't have a wide foot I feel like it would fit perfect. It's nice to have a little wiggle room while trying to put the shoe on a squirming kid. |
Product features
Watch Glass Beaker Cover, 2" Diameter
Highly functional laboratory glassware with a variety of uses in the classroom or lab.
In addition to covering beakers and flasks, watch glasses are useful for holding samples under low power microscopes, holding samples to be weighed and for high visibility observation of evaporation & crystallization
Manufactured with sturdiness in mind.
The 2mm thick, shatter resistant construction, ground edges & polished surface provides a safe product for handling in the classroom or laboratory.
ULTECHNOVO 4Pcs Watch Glass Beaker Covers Laboratory Watch Glass Evaporation Dish for Chemistry Class School Home Lab
ULTECHNOVO
Product description
Description
You are looking for high-quality glass watch it? Our products meet all your needs. Thick glass provides you with greater security, so you can rest assured that use. Don't hesitate! Come buy it.
Features
-Material: Glass
-Color: Transparent
-Size: 10x10x1cm 3.93x3.93x0.39in
Package Including
4 x Watch glasses
- LAB WATCH GLASS -The price is favorable and the service life is long.
- LAB WATCH GLASS -High transparency, easy to observe experimental results.
- LAB WATCH GLASS -Strong durability and corrosion resistance.
- LAB WATCH GLASS -Brand new: high-quality glass, so you can use it with confidence.
- LAB WATCH GLASS -Multifunctional: can be used as an evaporating dish, can be used as a lid, can be used as a container, can be used as a carrier
Watch Glass, 150mm Pack of 10
LabStock
Product description
Slightly concave watch glass, 150mm / 6 in. diameter, made of soda - lime glass. Many many uses around the laboratory including covering beakers to prevent evaporation or use as a shallow culture dish. 150mm size will serve as a nice lid for larger size beakers up to 2000 ml capacity. *** Please note: Edges are machine ground, not fire polished like a beaker or test tube rim. The fine-grit machine grinding does make the edge very smooth and safe for handling, but it will contain slight cosmetic blemishes. Please see image. ***
- Slightly concave watch glass, made of laboratory grade Soda-Lime glass
- 150mm / 6 in. diameter, serves as a nice lid for larger beakers to 2000ml capacity
- Machine ground edges, 2mm thickness
- Low cost pack of 10, a great choice for heavy classroom or laboratory use where some breakage can be expected
10pcs Lab Round Flat Glass Watches Glass Replacement 90mm
JRLGD
Product description
Attribute
Uses:Place the chemicals to be observed,but also cover the beaker to slow the evaporation of the contents and prevent dust from entering (but not sealing).
Material:Glass
Specifications:90mm diameter
Caracteristique
Made of high quality glass,high transparency,better observation.
Chamfered edges are designed to effectively prevent hand scratches.There have several sizes for choice,to meet your different size request.
Works great in labs,classrooms or for home experiments.
- Specifications:90mm diameter
- Made of high quality glass,high transparency,better observation
- Place the chemicals to be observed,but also cover the beaker to slow the evaporation of the contents and prevent dust from entering (but not sealing)
- Chamfered edges are designed to effectively prevent hand scratches.There have several sizes for choice,to meet your different size request
- Works great in labs,classrooms or for home experiments
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