What's a good product to use the smaller ones with? Amazon sell anything good?

You question makes no sense at all.

If needed, can these be cut to fit a specific size of funnel? Or would I be better off just buying some of the square filters and cutting those?

Buy the correct size for your Buckner funnel; if you are using a gravity funnel, look up how to fold round filter paper for this type filter.

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Whatman 1001-042 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 42.5mm Diameter (Pack of 100)

Whatman 1001-042 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 42.5mm Diameter (Pack of 100)

Product ID: 28253875

📏42.5mm precision diameter

🧪11 micron medium retention

⏱️10.5 s/100mL/sq inch flow rate

KD 11.90

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Description

🧪 Elevate your lab game with Whatman’s gold standard filter circles!

BALANCED FLOW RATE - 10.5 s/100mL/sq inch ensures efficient filtration speed
VERSATILE GRADE 1 QUALITY - Trusted across food, agriculture, air monitoring & education
OPTIMAL 11 MICRON RETENTION - Captures fine particulates without compromising flow
PRECISION CUT 42 5 MM CIRCLES - Perfectly sized for consistent lab results every time
PACK OF 100 FOR BULK EFFICIENCY - Stay stocked and ready for all your routine lab needs

Whatman 1001-042 Grade 1 quantitative filter paper circles measure 42.5mm in diameter with an 11 micron retention rating and a flow rate of 10.5 seconds per 100mL per square inch. Widely used in laboratories for qualitative and quantitative separations, these cellulose filters excel in applications spanning food industry testing, agriculture, air pollution monitoring, and educational labs. Each pack contains 100 precision-cut circles designed for reliable, consistent filtration performance.

Specifications

ASIN	B00394F978
Best Sellers Rank	#226,308 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #17 in Quantitative Lab Filter Paper
Date First Available	May 25, 2017
Item Weight	0.16 ounces
Item model number	F1000-1
Manufacturer	Whatman
Product Dimensions	3.5 x 2.3 x 1 inches

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