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Dissolution 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.

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.



Item Name Product Image Price

QLA O-Ring Sinker, Stainless Steel, 11.8 x 25.8 mm Capacity - CAPWHT-S99 (8399)

O-Ring Sinker, 316 Stainless Steel, 11.8 x 25.8 mm Sotax OEM No: 8399 O-Ring sinkers are useful where a capsule expands or swells during the...
QLA O-Ring Sinker, Stainless Steel, 11.8 x 25.8 mm Capacity - CAPWHT-S99 (8399) £23.00

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QLA Universal 8 Mesh Basket Sinker - BSK008-01

Universal 8 Mesh Basket Sinker Hand Fabricated Style - Can be used in all dissolution applications QLA innovated basket manufactured from woven...
QLA Universal 8 Mesh Basket Sinker - BSK008-01 £122.00

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QLA 8 Mesh Stainless Steel Sinker Basket, Flip Lid, 4cm x 1.5cm I.D. - BSK008-4x1.5cm

8 Mesh Stainless Steel Sinker Basket 8 mesh sinker basket, 316 Stainless Steel with flip lid, 4cm x 1.5cm I.D. Can be used in all dissolution...
QLA 8 Mesh Stainless Steel Sinker Basket, Flip Lid, 4cm x 1.5cm I.D. - BSK008-4x1.5cm
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QLA 8 Mesh Basket Sinker Japanese Pharmacopeia Size - BSK008-JP

8 Mesh Basket Sinker Japanese Pharmacopeia Size Hand Fabricated Style - Can be used in all dissolution applications QLA innovated basket...
QLA 8 Mesh Basket Sinker Japanese Pharmacopeia Size - BSK008-JP £122.00

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QLA PTFE Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-02

PTFE Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are designed to work...
QLA PTFE Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-02 £38.50

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QLA PTFE Coated Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-04

PTFE Coated Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are designed...
QLA PTFE Coated Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-04 £38.50

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QLA Stainless Steel Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-2S

Stainless Steel Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Helix Coil Type - Can be used in all dissolution applications Manufactured from media...
QLA Stainless Steel Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-2S £26.00

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QLA Stainless Steel Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-4S

Stainless Steel Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Helix Coil Type - Can be used in all dissolution applications Manufactured from media...
QLA Stainless Steel Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-4S £26.00

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QLA PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 10.4 mm Capacity - CAPWHT-LG

PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 10.4 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are...
QLA PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 10.4 mm Capacity - CAPWHT-LG £42.00

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QLA Spiral Capsule Sinker, Orange Coated Music Wire, 1.10" L x .41" W - CAPWHT-LGMT

Spiral Capsule Sinker, Orange Coated Music Wire Helix Coil Type -  1.10" L x .41" W capacity, 6.5 coils The Sinker Floating...
QLA Spiral Capsule Sinker, Orange Coated Music Wire, 1.10" L x .41" W - CAPWHT-LGMT £55.50

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QLA Breath Film Stainless Steel Sinker - CAPWHT-PC

Breath Film Sinker Can be used in all dissolution applications Specially designed to sink thin film but marinating minimal contact with the...
QLA Breath Film Stainless Steel Sinker - CAPWHT-PC £56.50

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QLA 3 Pronged Capsule Sinker, Uncoated Stainless Steel, VanKel (Varian) Style - CAPWHT-SV

3 Pronged Capsule Sinker, Uncoated Stainless Steel, VanKel (Varian) Style Can be used in all dissolution applications Thinner design than...
QLA 3 Pronged Capsule Sinker, Uncoated Stainless Steel, VanKel (Varian) Style - CAPWHT-SV £21.00

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QLA Time Release Capsule Sinker - CAPWHT-TR

Time Release Capsule Sinker Can be used in all dissolution applications Specially designed for long release tablets or capsules, the time...
QLA Time Release Capsule Sinker - CAPWHT-TR £28.50

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QLA 3 Pronged Capsule Sinker, VanKel (Varian) Style - CAPWHT-VK (12-3050)

3 Pronged Capsule Sinker, VanKel (Varian) Style Varian VanKel OEM No: 12-3050 Magnetic legs permit use in robotic systems. This design of sinker...
QLA 3 Pronged Capsule Sinker, VanKel (Varian) Style - CAPWHT-VK (12-3050) £22.00

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QLA PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 11.7 mm Capacity - CAPWHT-XL

PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 11.7 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are...
QLA PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 11.7 mm Capacity - CAPWHT-XL £42.00

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QLA Stainless Steel Capsule Sinker, 4 Spiral, 33.5 x 11.7 mm Capacity - CAPWHT-XLS

Stainless Steel Capsule Sinker, 4 Spiral, 33.5 x 11.7 mm Helix Coil Type - Can be used in all dissolution applications Manufactured from media...
QLA Stainless Steel Capsule Sinker, 4 Spiral, 33.5 x 11.7 mm Capacity - CAPWHT-XLS £35.50

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QLA Stainless Steel Capsule Sinker, 5.5 Spiral, 22.4 x 11.81 mm Capacity - CAPWHT-XLSS

Stainless Steel Capsule Sinker, 5.5 Spiral, 22.4 x 11.81 mm Helix Coil Type Manufactured from media resistant stainless steel. 5.5 turn spiral...
QLA Stainless Steel Capsule Sinker, 5.5 Spiral, 22.4 x 11.81 mm Capacity - CAPWHT-XLSS £44.50

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QLA Stainless Steel Capsule Sinker, 6 Spiral, 25.4 x 14.6 mm Capacity - CAPWHT-XS

Stainless Steel Capsule Sinker, 6 Spiral, 25.4 x 14.6 mm Helix Coil Type - Can be used in all dissolution applications Manufactured from media...
QLA Stainless Steel Capsule Sinker, 6 Spiral, 25.4 x 14.6 mm Capacity - CAPWHT-XS £44.00

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QLA Stainless Steel Capsule Sinker, 4 Spiral, 15.5 x 5.0 mm, Sotax Style - CAPWST-15 (8280)

Stainless Steel Capsule Sinker, 4 Spiral, 15.5 x 5.0 mm Sotax (Manual) Style - OEM No: 8280 Manufactured from media resistant stainless steel, 4...
QLA Stainless Steel Capsule Sinker, 4 Spiral, 15.5 x 5.0 mm, Sotax Style - CAPWST-15 (8280) £29.50

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QLA Spring Style Capsule Sinker, 316 SS, .71" (18mm) L × .24" (6mm) W capacity, Sotax Style - CAPWST-18 (7346)

Stainless Steel Capsule Sinker, 8.7 Spiral, 18.0 x 6.0 mm   Sotax (Manual) Style - OEM No: 7346   Manufactured from media resistant...
QLA Spring Style Capsule Sinker, 316 SS, .71" (18mm) L × .24" (6mm) W capacity, Sotax Style - CAPWST-18 (7346) £29.50

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