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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.

Japanese Pharmacopeia Basket Sinker. Certified USP compliant

Part Number	Pack Size	Price	Buy
CERTBSK-JP	Each	£150.80

Japanese Pharmacopeia Basket Sinker. (This has the same dimensions as the sinker shown in the USP).

Stationary Basket Assembly, 10 Mesh

Part Number	Pack Size	Price	Buy
STABSK-10	Each	£218.44

Stationary Basket Assembly, 10 Mesh. Includes basket and shaft

5.5 Spiral Stainless Steel Capsule Sinker 22.4 x 11.81mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-XLSS	Each	£33.50

5.5 Spiral Stainless Steel Capsule Sinker 22.4 x 11.81mm Capacity. 5.5 coils.

4 Spiral Stainless Steel Capsule Sinker 33.5 x 11.7mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-XLS	Each	£27.06

4 Spiral Stainless Steel Capsule Sinker 33.5 x 11.7mm Capacity

Felodipine Test Suspended Basket Apparatus

Part Number	Pack Size	Price	Buy
STABSK-VK8	Each	£212.39

Felodipine Test Suspended Basket apparatus for use with most dissolution testers

10 Spiral Stainless Steel Capsule Sinker 31.0 x 11.0mm Capacity. Sotax Style

Part Number	Pack Size	Price	Buy
CAPWST-31	Each	£26.48

10 Spiral Stainless Steel Capsule Sinker 31.0 x 11.0mm Capacity

7 Spiral Stainless Steel Capsule Sinker 23.0 x 8.0mm Capacity. Sotax Style

Part Number	Pack Size	Price	Buy
CAPWST-23	Each	£26.48

7 Spiral Stainless Steel Capsule Sinker 23.0 x 8.0mm Capacity

6 Spiral Stainless Steel Capsule Sinker 19.3 x 7.0mm Capacity. Sotax Style

Part Number	Pack Size	Price	Buy
CAPWST-19	Each	£26.48

6 Spiral Stainless Steel Capsule Sinker 19.3 x 7.0mm Capacity

5 Spiral Stainless Steel Capsule Sinker 18.0 x 6.0mm Capacity. Sotax Style

Part Number	Pack Size	Price	Buy
CAPWST-18	Each	£26.48

5 Spiral Stainless Steel Capsule Sinker 18.0 x 6.0mm Capacity

4 Spiral Stainless Steel Capsule Sinker 15.5 x 5.0mm Capacity. Sotax Style

Part Number	Pack Size	Price	Buy
CAPWST-15	Each	£26.48

4 Spiral Stainless Steel Capsule Sinker 15.5 x 5.0mm Capacity

6 Spiral PTFE Coated Capsule Sinker 22.9 x 9.4mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-02	Each	£28.98

6 Spiral PTFE Coated Capsule Sinker 22.9 x 9.4mm Capacity

6 Spiral Stainless Steel Capsule Sinker 22.9 x 9.4mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-2S	Each	£17.24

6 Spiral Stainless Steel Capsule Sinker 22.9 x 9.4mm Capacity

4 Spiral PTFE Coated Capsule Sinker 26.0 x 9.7mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-04	Each	£28.98

4 Spiral PTFE Coated Capsule Sinker 26.0 x 9.7mm Capacity

4 Spiral Stainless Steel Capsule Sinker 26.0 x 9.7mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-4S	Each	£17.24

4 Spiral Stainless Steel Capsule Sinker 26.0 x 9.7mm Capacity

4 Spiral PTFE Coated Capsule Sinker 33.5 x 10.4mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-LG	Each	£31.41

4 Spiral PTFE Coated Capsule Sinker 33.5 x 10.4mm Capacity

4 Spiral PTFE Coated Capsule Sinker 33.5 x 11.7mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-XL	Each	£31.41

4 Spiral PTFE Coated Capsule Sinker 33.5 x 11.7mm Capacity

6 Spiral Stainless Steel Capsule Sinker 25.4 x 14.6mm Capacity

Part Number	Pack Size	Price	Buy
CAPWHT-XS	Each	£31.26

6 Spiral Stainless Steel Capsule Sinker 25.4 x 14.6mm Capacity

3 Pronged Capsule Sinker with Magnetic Top VanKel (Varian) Style

Part Number	Pack Size	Price	Buy
MAGWHT-VKTOP	Each	£17.86

3 Pronged Capsule Sinker with Magnetic Top VanKel (Varian) Style

3 Pronged Capsule Sinker, Uncoated Stainless Steel Vankel (Varian) Style

Part Number	Pack Size	Price	Buy
CAPWHT-SV	Each	£18.40

3 Pronged Capsule Sinker Stainless Steel

3 Pronged Capsule Sinker with Magnetic Legs VanKel (Varian) Style

Part Number	Pack Size	Price	Buy
MAGWHT-VK	Each	£35.52

3 Pronged Capsule Sinker with Magnetic Legs VanKel (Varian) Style

3 Pronged Capsule Sinker VanKel (Varian) Style

Part Number	Pack Size	Price	Buy
CAPWHT-VK	Each	£16.91

3 Pronged Capsule Sinker VanKel (Varian) Style

O-Ring Sinker 316 stainless steel 11.8 x 25.8mm capacity

Part Number	Pack Size	Price	Buy
CAPWHT-S99	Each	£16.41

O-Ring Sinker 316 stainless steel 11.8 x 25.8mm capacity

Time Release Capsule Sinker

Part Number	Pack Size	Price	Buy
CAPWHT-TR	Each	£19.89

Time Release Capsule Sinker

Breath Film Sinker

Part Number	Pack Size	Price	Buy
CAPWHT-PC	Each	£42.62

Breath Film Sinker

40 Mesh Basket Sinker, VanKel (Varian) Style

Part Number	Pack Size	Price	Buy
SNK040-VK	Each	£152.37

40 Mesh Basket Sinker VanKel (Varian) Style

10 Mesh Basket Sinker, VanKel (Varian) Style

Part Number	Pack Size	Price	Buy
SNK010-VK	Each	£152.37

10 Mesh Basket Sinker VanKel (Varian) Style

8 Mesh Basket Sinker, VanKel (Varian) Style

Part Number	Pack Size	Price	Buy
SNK008-VK	Each	£152.37

8 Mesh Basket Sinker VanKel (Varian) Style

8 Mesh Basket Sinker Japanese Pharmacopeia Size

Part Number	Pack Size	Price	Buy
BSK008-JP	Each	£77.94

8 Mesh Basket Sinker Japanese Pharmacopeia Size

8 Mesh Basket Sinker

Part Number	Pack Size	Price	Buy
BSK008-01	Each	£77.94

8 Mesh Basket Sinker

Type 316 Stainless Steel Wire 0.6mm dia 15m Roll

Part Number	Pack Size	Price	Buy
WIRESK-VK	Each	£76.71

Type 316 Stainless Steel Wire

Custom weights and sinkers made to your specification

Part Number	Pack Size	Enquire
CAPWHT-CUS	Each

Custom weights and sinkers made to your specification

Top Tips

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.

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