Does this beaker require a #7 or #8 stopper?

This beaker came with the stopper that fit, it is a #9 Stopper.

Anyone know the maximum heating temperature?

"The maximum working temperature for PYREX glassware is 490°C. However, once the temperature exceeds 150°C, ensure that heating and cooling is achieved in a slow and uniform manner."

can I pull a vacuum on these flasks? Thanks, AL

They look pretty sturdy, so I'd imagine so ... but I've never tried. However, they are pretty typical Pyrex (meaning, they are very well made).

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Corning Pyrex #4980-1L, 1000ml Narrow Mouth Erlenmeyer Flask with Rubber Stopper (Single)

Product ID: 65903242

Details

Bottom Shape
Round
Brand
Corning
Capacity
1000
Graduation Interval
50 Milliliters
Material
Borosilicate

📏Graduations every 50ml for accuracy

🧪1000ml precision capacity

🛡️Heavy duty rim for chip resistance

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Description

🧪 Elevate your experiments with Pyrex precision and durability!

BUILT TO WITHSTAND - Heavy duty rim reduces chipping, extending flask lifespan in busy labs or creative spaces.
SECURE SEAL INCLUDED - Comes with a snug rubber stopper to keep your contents safe and contamination-free.
DROP TESTED PACKAGING - Arrives in a custom double-wall corrugated box that survives 4-foot drops—because your tools deserve the best.
GRADUATED FOR EXACTNESS - Clear 50ml increments from 250ml to 1000ml ensure precise measurement every time.
PRECISION MEETS DURABILITY - 1000ml borosilicate glass with uniform wall thickness balances strength and thermal shock resistance.

The Corning Pyrex #4980-1L Erlenmeyer flask offers a 1000ml capacity with precise 50ml graduations, crafted from durable borosilicate glass featuring a heavy duty rim to resist chipping. It includes a rubber stopper for secure sealing and is shipped in robust, drop-tested packaging, making it a top choice for professionals demanding reliability and accuracy in laboratory or industrial settings.

Specifications

ASIN	B07CQFB1S1
Best Sellers Rank	#24,516 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab Erlenmeyer Flasks
Bottom Shape	Round
Brand Name	Corning
Capacity	1000 Milliliters
Customer Reviews	4.8 4.8 out of 5 stars (747)
Graduation Interval	50 Milliliters
Item Dimensions D x W x H	5.08"D x 5.08"W x 8.5"H
Manufacturer	Karter Scientific
Material Type	Borosilicate Glass
Model Number	4980-1L(Flask-RS)
Part Number	4980-1L-RS

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42467CFA

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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