Powder Angle of Repose
Powder Flow Angle Tester
Powder Pile Angle Tester
Angle of Repose Tester
Powder Flowability Tester
USP 1174 Angle of Repose
ISO 4324 Angle of Repose Apparatus
ASTM D6393 Powder Characterization
Powder Granular Heap Angle Tester
Powder Bulk Flow Angle Tester
Expert Angle of Repose Determination
Expert Powder Critical Angle of Stability Measurement
ASTM D6393 ASTM D6941 ISO 4324
ISO 8398 DIN EN ISO 4324 DIN EN 12047
USP 1174 Ph. Eur. 2.9.36/17

ASTM ISO USP Powder Angle of Repose - Orifice Diameter:

We provide precision equipment you need for repeatable powder testing. While we offer a range of precision engineered Funnel Sizes up to 25mm, choosing the right Orifice is about more than just getting the powder to fall, it's about the integrity of your data.

The 5mm Standard: The validated Choice
Our 5.0mm precision engineered Orifice is the center of professional powder characterization.

Global Comparability: Most international standards including ISO 4324 and USP <1174> are built around the 5mm opening. Using this size ensures your results can be compared with labs and suppliers and your customers and clients worldwide.

Controlled Flow: A 5mm stream prevents 'Cone Collapse'. It allows particles to settle naturally, giving you a true measurement of the powder's internal friction.

Our Tip: Even for 'sticky' powders, we recommend using our included Stainless Steel Stirring Rod with the 5mm Precision Funnel. This maintains standard compliance while gently assisting the flow.

When to Choose a Larger Orifice (10mm - 25mm)
We know that in the real world, some industrial powders are extremely cohesive and simply will not pass through a 5mm opening. We offer larger custom engineered Precision Funnels with an Orifice Diameter of up to 25mm to ensure you can still complete your tests, however, test results may be outside of recognized Test Standards and primarily helpful for your laboratory's internal QC.

What you should know before choosing a larger size:

Beyond the Standard: Using a larger Orifice usually moves your test outside of recognized ISO/USP specifications. You are creating an 'Internal Standard' rather than a globally comparable one.

The 'Avalanche' Effect: A 10mm or larger stream is much heavier. The weight of the falling powder can compress the pile, often resulting in a slightly shallower angle than a standard test would show.

Why We Tell You This:
Other shops might simply sell you a larger funnel without a second thought. We believe in Honest Engineering. We want you to have the funnel that works for your material, but we also want you to know exactly how that choice affects your scientific data.

Whether you need the precision engineered Orifice with a diameter of 5mm as recognized standard or the convenience of a larger precision engineered customized Funnel, we have the precision equipment to get the job done.