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Beakers, Glass, continued
Beaker, Borosilicate Glass
This is your basic beaker. Enamel graduations. All sizes have an extra- large marking
spot. The 50-mL through 4-L size borosilicate glass beakers are graduated in metric
scale to indicate approximate volume.
Catalog No.
Capacity
(mL) Graduation Range Price/Each Price/Pkg. Price/Case
GP1000 10 Not graduated $ 3.95 $45.72/12 $176.16/48
GP1005 50 10–40 3.45 39.36/12 149.28/48
GP1010 100 20–80 3.50 39.96/12 152.16/48
GP1015 150 20–140 3.50 39.96/12 152.16/48
GP1020 250 25–200 3.55 40.20/12 152.16/48
GP1025 400 25– 325 3.95 44.76/12 168.96/48
GP1030 600 50–500 4.75 27.48/6 162.00/36
GP1040 1000 50–1000 8.65 49.80/6 197.28/24
GP1045 2000 200–2000 21.00 82.40/4 160.00/8
GP9157 4000 500–3500 75.15 — 437.40/6
APPARATUS BEAKERS, GLASS
Beaker, Borosilicate
Glass
GP1000, etc.
What Is Borosilicate Glass?
Borosilicate glass is a strong, heat-resistant, soda-lime glass that
contains
a minimum of 5% boric oxide. It has a low coefficient
of expansion
and a very high resistance to chemical attack. Borosilicate glass
can withstand continuous use at temperatures up to 482 °C. Common
trade names for borosilicate glass include Pyrex® and Kimax®.
Beakers, Glass, Accessories
Hot Vessel Gripping Device
A unique silicone rubber device that enables teacher or student to grip hot vessels,
such as beakers and flasks. Silicone rubber will withstand very high temperatures
(260 °C). Fits any hand size. The gripping surface is studded to provide a positive grip.
This safety device is also useful for handling very cold vessels.
Catalog No. Description Price/Each
SE039 Hot Vessel Gripping Device $22.00
Beakers, Plastic
Hot Vessel
Gripping Device
SE039
Beaker, Polymethylpentene (PMP)
PMP plastic has transparency almost equal to glass. The chemical resistance is
excellent. Avoid, however, prolonged exposure to strong oxidizers and hydrocarbons.
PMP can withstand short exposure to temperatures as high as 175 °C. Continuous
exposure at 150 °C is possible. Graduated.
Catalog No. Description Capacity (mL)
Graduation
Intervals Price/Each
AP1206 Beaker,
Polymethylpentene
(PMP)
50 10 mL $ 5.70
AP1207 100 5 mL 6.25
AP1208 250 25 mL 11.50
AP1209 400 50 mL 13.65
AP1210 600 50 mL 17.90
AP1211 1000 100 mL 24.85
Beaker,
Polymethylpentene
(PMP)
AP1206, etc.
BEAKERS, PLASTIC continued on next page.
Glass can safely resist almost all chemical substances. It is neither affected by
nor does it affect the materials it contacts. In other words, it is generally inert.
Glass is transparent so liquid levels, colors and color changes are easily viewed;
it can be repeatedly heated and cooled. Glass is non-porous, easily cleaned and
can be repeatedly sterilized.
Flaws or scratches reduce the natural strength of glass. Why? When glass is
formed (no matter what the product or shape) the surface cools faster than the
interior. A compressed
skin surrounds the inside in a state of tension. When glass
is tempered (just like metal), the surface is deliberately
cooled much faster to
make the skin tighter. This makes the piece stronger.
A scratch or a flaw, however, creates a weak point. A break usually starts from
such a flaw. Always examine a piece of glassware for obvious scratches or flaws,
particularly if the vessel will be subjected to extreme temperatures, mechanical
stress or vacuums.
Metal or glass stirring rods may scratch glass, so use a rubber policeman on the
end of your stirring rod or use a plastic stirring rod. If you intentionally scratch a
glass vessel to start crystallization, then we urge you to consider discarding the
vessel after use.
When you set up glass apparatus, remember that each clamp you use can
become a stress point. You may wish to use coated or cushioned clamps and
only as many clamps as are necessary. Always distribute the weight in such a
glass setup evenly.
Rapidly heating or cooling glass sets up stress. Avoid the risk of vessel failure by
warming or cooling a vessel slowly. Particularly avoid placing a hot piece of glass
on a cool surface and vice versa.
Also, when heating beakers on a burner, always use wire gauze with a ceramic
center. If a ceramic center is not used, the glass beaker will eventually
fail thermally
(i.e., it will break when it is heated).
Glassware
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