Tel: +1 908 685 7500
Email: Capsule Sinkers
Floating dosage forms rarely dissolve at a reproducible rate. Using a sinker in Apparatus 2 fixes the dosage form to a certain point and aids reproducibility. Sinkers can also be useful where dosage forms may stick to the sides of the vessel.
See our Sinker Selection Guide to help select the right sinker for your application
General guidelines to consider when choosing a sinker for your application include:
- Sinker Size - the sinker should have minimal surface contact with the tablet as this can affect the dissolution rate.
- Sinker Weight - should be kept to a minimum - just enough to have a desired effect.
- PTFE Coated Sinkers Magnetic - used with magnetic retrieval systems, or where there may be a reaction between steel and the tablet.
- Uncoated - type 316 stainless steel sinkers are more durable than coated sinkers.
- Basket Sinkers - can be used but care should be taken that the outer coating of the tablet does not clog the mesh
- Wire Spirals - should be as wide as practically possible to avoid clogging.
All genuine QLA Products are manufactured to ISO9001 quality standards.
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Japanese Pharmacopeia Basket Sinker. Certified USP compliant
Japanese Pharmacopeia Basket Sinker. Certified compliant to USP Specifications. Top grade stainless steel for long life.
OEM Part# 12-3070, 302-9000
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Magnetic Japanese Pharmacopeia Basket Sinker
A Magnetic Version of the Japanese Pharmacopeia Basket Sinker. (This has the same dimensions as the sinker shown in the USP).
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Stainless Steel Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity
Stainless Steel Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity
OEM Part# 302-9051-6
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Stainless Steel Capsule Sinker with 10 Spirals, 31.0 x 11.0mm Capacity. Sotax Style
Stainless Steel Capsule Sinker with 10 Spirals, 31.0 x 11.0mm Capacity
OEM Part# 7349
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Sinker for Alfuzosin Hydrochloride Dissolution
Alfuzosin Hydrochloride Extended-Release Tablets Dissolution Cylinder Sinker. USP Compliant
See USP Monograph for testing procedure
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80 Mesh Basket Sinker, With Lid
80 Mesh Basket Sinker with Lid. Can be used with any dissolution tester.
OEM Part# 12-3064
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20 Mesh Basket Sinker, With Lid
20 Mesh Basket Sinker with lid. Can be used with any dissolution tester
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Stainless Steel Capsule Sinker with 5.5 Spirals, 29.2 x 11.8mm Capacity
Stainless Steel Capsule Sinker with 5.5 Spirals, 29.2 x 11.8mm Capacity.
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Stainless Steel Capsule Sinker with 4 Spirals, 22.5 x 11.8mm Capacity
Stainless Steel Capsule Sinker with 4 Spirals, 22.5 x 11.8mm Capacity
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Stainless Steel Capsule Sinker with 7 Spirals 23.0 x 8.0mm Capacity. Sotax Style
Stainless Steel Capsule Sinker with 7 Spirals 23.0 x 8.0mm Capacity
OEM Part# 6881
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Stainless Steel Capsule Sinker with 6 Spirals, 19.3 x 7.0mm Capacity. Sotax Style
Stainless Steel Capsule Sinker with 6 Spirals, 19.3 x 7.0mm Capacity
OEM Part# 8283
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Stainless Steel Capsule Sinker with 8 Spirals, 18.0 x 6.0mm Capacity. Sotax Style
Stainless Steel Capsule Sinker with 8 Spirals, 18.0 x 6.0mm Capacity
OEM Part# 7346
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Stainless Steel Capsule Sinker with 4 Spirals 15.5 x 5.0mm Capacity. Sotax Style
Stainless Steel Capsule Sinker with 4 Spirals 15.5 x 5.0mm Capacity
OEM Part# 8280
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PTFE Coated Capsule Sinker with 4 Spirals, 29.2 x 11.8mm Capacity
PTFE Coated Capsule Sinker with 4 Spirals, 29.2 x 11.8mm Capacity
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PTFE Coated Capsule Sinker with 4 Spirals, 27.9 x 10.4mm Capacity
PTFE Coated Capsule Sinker with 4 Spirals, 27.9 x 10.4mm Capacity
OEM Part# 1302-9062-6
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Stainless Steel Capsule Sinker with 4 Spirals, 21.3 x 9.8mm Capacity
Stainless Steel Capsule Sinker with 4 Spirals, 21.3 x 9.8mm Capacity
OEM Part# 302-9050-6
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PTFE Coated Capsule Sinker with 4 Spirals, 21.4 x 9.8mm Capacity
PTFE Coated Capsule Sinker with 4 Spirals, 21.4 x 9.8mm Capacity
OEM Part# 302-9060-6
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PTFE Coated Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity
PTFE Coated Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity
OEM Part# 302-9061-6
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Stainless Steel Capsule Sinker with 6 Spirals, 22.5 x 14.7mm Capacity
Stainless Steel Capsule Sinker with 6 Spirals, 22.5 x 14.7mm Capacity
OEM Part# 302-9053-6
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3 Pronged Capsule Sinker, Uncoated Stainless Steel Vankel (Varian) Style
3 Pronged Capsule Sinker Stainless Steel
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3 Pronged Capsule Sinker with Magnetic Top VanKel (Varian) Style
3 Pronged Capsule Sinker with Magnetic Top VanKel (Varian) Style
OEM Part# 12-3055
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3 Pronged Capsule Sinker with Magnetic Legs VanKel (Varian) Style
3 Pronged Capsule Sinker with Magnetic Legs VanKel (Varian) Style
OEM Part# 12-3056
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O-Ring Sinker 316 stainless steel 11.8 x 25.8mm capacity
O-Ring Sinker 316 stainless steel 11.8 x 25.8mm capacity
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40 Mesh Basket Sinker, With Lid
40 Mesh Basket Sinker with Lid. Can be used with any dissolution tester.
OEM Part# 12-3064
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10 Mesh Basket Sinker, With Lid
10 Mesh Basket Sinker with lid. Can be used with any dissolution tester
OEM Part# 12-3060
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8 Mesh Basket Sinker, with lid.
8 Mesh Basket Sinker with lid VanKel (Varian) Style
OEM Part# 12-3062
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8 Mesh Basket Sinker Japanese Pharmacopeia Size
8 Mesh Basket Sinker Japanese Pharmacopeia Size
OEM Part# 302-9066-6
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Custom weights and sinkers made to your specification
Custom weights and sinkers made to your specification
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Felodipine Test Suspended Basket Apparatus
Felodipine Test Suspended Basket apparatus for use with most dissolution testers. 8 Mesh, USP Standard with 10mm ID
Capsule Sinkers
Although the USP does not specify the dimensions of sinkers allowing different sinkers to be used, it does have a diagram showing a suitable sinker device. This is the CERTBSK-JP. We guarantee this sinker will meet the specification.
Other documents may refer to other sinkers. For example the monograph for Amantadine Hydrochloride capsules (Pharmacopeial Forum Vol. 35(3) specifies CAPWHT-2S.
Capsule Sinker Types Video 
About Capsule Sinkers 
Sinker Selection Guide 
Capsule Size Guide 
Alfuzosin Hydrochloride Testing 
Spiral Sinker Specifications 
QLA ISO9001 Certificate 
Dissolution Accessories Brochure 
