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 diameter precision

🧪11µm medium retention

⏱️10.5 s/100mL/sq inch flow rate

C$2862

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Description

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

BULK PACK OF 100 - Stay stocked and ready—ideal for high-demand environments and continuous testing cycles.
VERSATILE GRADE 1 QUALITY - Trusted across food, agriculture, air pollution, and educational labs for diverse applications.
OPTIMAL 11 MICRON RETENTION - Captures fine particulates with medium retention, balancing speed and accuracy effortlessly.
PRECISION CUT 42 5 MM CIRCLES - Perfectly sized for consistent lab results and seamless integration into your workflow.
RELIABLE 10 5 S 100 M L FLOW RATE - Engineered for efficient filtration without compromising clarity or throughput.

Whatman 1001-042 Grade 1 filter paper circles (42.5mm diameter) offer medium retention at 11 microns and a flow rate of 10.5 seconds per 100mL per square inch. Widely used in food, agriculture, air pollution monitoring, and education, these 100-pack cellulose filters deliver consistent, reliable filtration for routine analytical separations.

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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