Lab Watch Glasses Beaker Cover Set in 100mm 90mm 75mm 60mm For Laboratory

Description

Introduction：

A watch glass is a circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance and as a cover for a beaker. A larger watchglass may be referred to as a clockglass.

Feature:

1. 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

2. 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)

3. The sturdy construction and makes these covers an excellent choice for science classrooms

4. 5 different sizes: 100 mm, 90 mm, 80mm, 70mm and 60 mm which are great for various uses.

 

Code	Material	Diameter	Packing	G.W(kg)
1175-60mm	Glass	60mm	1000pcs/ctn	14
1175-70mm	Glass	70mm	600pcs/ctn	12
1175-80mm	Glass	80mm	600pcs/ctn	15
1175-90mm	Glass	90mm	600pcs/ctn	16
1175-100mm	Glass	100mm	600pcs/ctn	22

 

Detail photos：

 

Using:

One of the generic uses of a watch glass includes as a lid for beakers. In this case a watch glass is placed above the container, which makes it easier to control and alter vapour saturation conditions. Moreover, a watch glass is often used to house solids being weighed on the scale. Prior to weighing desired amount of solid, a watch glass is placed on the scale, followed by taring or zeroing the scale so that only the weight of the sample substance is obtained. Not only can a watch glass be used for observing precipitation patterns and crystals, it can also be used for drying solids.

Another technique used in chemistry laboratories to increase the drying rate is passing a gentle stream of dry air or nitrogen gas over the watch glass from an inverted funnel clamped above it.

 

Specifications:

There are two types, glass watch glasses and plastic watch glasses, used in the laboratory.  These watch glasses are available in various sizes and widths.  Watch glasses are usually thicker than any other glass or plastic labware. Glass watch glasses – This can be reused after it is sterilized in an autoclave or a laboratory oven.  The glasses made provide high resistance to thermal shock, chemical resistance and withstand mechanical durability.

 

Question&Answer:

 

1. How about the delivery time?

Sample for free, it will arrive at destination within 3-7 days by DHL FEDEX UPS.

Small quantities, it will arrive at destination within 5-10 days by air.

Large quantities, it will arrive at destination within 25-35 days by sea.

 

2.Where are your manufacturer?

Our factory is local in Chongqing.

 

3. What is your main products?

Our main products include centrifuge tube, test tube, microscope slide, pipette tip, urine container, blood collection tubes, female swab, blood lancets and other plastic labwares.

 

4.Do you have any certifications?

Yes, we have the CE, ISO.