Serving Scientists Since 1994

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.

See Video about Capsule Sinker types! Video

37 Item(s)

per page
  1. Japanese Pharmacopeia Basket Sinker. Certified USP compliant

    Japanese Sinker. Certified USP compliant
    Part Number Pack Size Enquire
    CUSBSK-JP Each
  2. Stainless Steel Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity

    6 Spiral Stainless Steel Capsule Sinker 22.9 x 9.4mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-2S Each
  3. Magnetic Japanese Pharmacopeia Basket Sinker

    Magnetic Japanese Sinker
    Part Number Pack Size Enquire
    CUSBSK-JPMAG Each

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

  4. Stainless Steel Capsule Sinker with 7 Spirals 23.0 x 8.0mm Capacity. Sotax Style

    7 Spiral Stainless Steel Capsule Sinker 23.0 x 8.0mm Capacity. Sotax Style
    Part Number Pack Size Enquire
    CAPWST-23 Each

    Stainless Steel Capsule Sinker with 7 Spirals 23.0 x 8.0mm Capacity

    OEM Part# 6881

  5. Stainless Steel Capsule Sinker with 10 Spirals, 31.0 x 11.0mm Capacity. Sotax Style

    10 Spiral Stainless Steel Capsule Sinker 31.0 x 11.0mm Capacity. Sotax Style
    Part Number Pack Size Enquire
    CAPWST-31 Each

    Stainless Steel Capsule Sinker with 10 Spirals, 31.0 x 11.0mm Capacity

    OEM Part# 7349

  6. Stainless Steel Capsule Sinker with 4 Spirals, 22.5 x 11.8mm Capacity

    4 Spiral Stainless Steel Capsule Sinker 22.5 x 11.8mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-XLSS Each

    Stainless Steel Capsule Sinker with 4 Spirals, 22.5 x 11.8mm Capacity

  7. Stainless Steel Capsule Sinker with 5.5 Spirals, 29.2 x 11.8mm Capacity

    5.5 Spiral Stainless Steel Capsule Sinker 29.2 x 11.8mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-XLS Each

    Stainless Steel Capsule Sinker with 5.5 Spirals, 29.2 x 11.8mm Capacity.


  8. 20 Mesh Basket Sinker, With Lid

    /
    Part Number Pack Size Enquire
    SNK020-VK Each

    20 Mesh Basket Sinker with lid. Can be used with any dissolution tester

  9. 80 Mesh Basket Sinker, With Lid

    80 Mesh Basket Sinker, With Lid
    Part Number Pack Size Enquire
    SNK080-VK Each

    80 Mesh Basket Sinker with Lid. Can be used with any dissolution tester.


    OEM Part# 12-3064

  10. Sinker for Alfuzosin Hydrochloride Dissolution

    Sinker for Alfuzosin Hydrochloride Dissolution Sinker
    Part Number Pack Size Enquire
    CUSBSK-ALF Each

    Alfuzosin Hydrochloride Extended-Release Tablets Dissolution Cylinder Sinker. USP Compliant


    See USP Monograph for testing procedure

  11. Stainless Steel Capsule Sinker with 6 Spirals, 19.3 x 7.0mm Capacity. Sotax Style

    6 Spiral Stainless Steel Capsule Sinker 19.3 x 7.0mm Capacity. Sotax Style
    Part Number Pack Size Enquire
    CAPWST-19 Each

    Stainless Steel Capsule Sinker with 6 Spirals, 19.3 x 7.0mm Capacity

    OEM Part# 8283

  12. 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. Sotax Style
    Part Number Pack Size Enquire
    CAPWST-18 Each

    Stainless Steel Capsule Sinker with 8 Spirals, 18.0 x 6.0mm Capacity

    OEM Part# 7346

  13. PTFE Coated Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity

    6 Spiral PTFE Coated Capsule Sinker for dissolution. 21.3 x 9.4mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-02 Each

    PTFE Coated Capsule Sinker with 6 Spirals, 21.3 x 9.4mm Capacity

    OEM Part# 302-9061-6

  14. PTFE Coated Capsule Sinker with 4 Spirals, 21.4 x 9.8mm Capacity

    4 Spiral PTFE Coated Capsule Sinker 21.4 x 9.8mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-04 Each

    PTFE Coated Capsule Sinker with 4 Spirals, 21.4 x 9.8mm Capacity

    OEM Part# 302-9060-6

  15. Stainless Steel Capsule Sinker with 4 Spirals, 21.3 x 9.8mm Capacity

    4 Spiral Stainless Steel Capsule Sinker 21.3 x 9.8mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-4S Each

    Stainless Steel Capsule Sinker with 4 Spirals, 21.3 x 9.8mm Capacity

    OEM Part# 302-9050-6

  16. PTFE Coated Capsule Sinker with 4 Spirals, 27.9 x 10.4mm Capacity

    4 Spiral PTFE Coated Capsule Sinker 27.9 x 10.4mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-LG Each

    PTFE Coated Capsule Sinker with 4 Spirals, 27.9 x 10.4mm Capacity

    OEM Part# 1302-9062-6

  17. PTFE Coated Capsule Sinker with 4 Spirals, 29.2 x 11.8mm Capacity

    4 Spiral PTFE Coated Capsule Sinker 29.2 x 11.8mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-XL Each

    PTFE Coated Capsule Sinker with 4 Spirals, 29.2 x 11.8mm Capacity

  18. Stainless Steel Capsule Sinker with 6 Spirals, 22.5 x 14.7mm Capacity

    6 Spiral Stainless Steel Capsule Sinker 22.5 x 14.7mm Capacity
    Part Number Pack Size Enquire
    CAPWHT-XS Each

    Stainless Steel Capsule Sinker with 6 Spirals, 22.5 x 14.7mm Capacity

    OEM Part# 302-9053-6

  19. Stainless Steel Capsule Sinker with 4 Spirals 15.5 x 5.0mm Capacity. Sotax Style

    4 Spiral Stainless Steel Capsule Sinker 15.5 x 5.0mm Capacity. Sotax Style
    Part Number Pack Size Enquire
    CAPWST-15 Each

    Stainless Steel Capsule Sinker with 4 Spirals 15.5 x 5.0mm Capacity

    OEM Part# 8280

  20. 3 Pronged Capsule Sinker Plastic

    3 Pronged Capsule Sinker Plastic
    Part Number Pack Size Enquire
    CAPWHT-VK Each

    3 Pronged Capsule Sinker VanKel (Varian) Style. Plastic

  21. 3 Pronged Capsule Sinker with Magnetic Legs VanKel (Varian) Style

    3 Pronged Capsule Sinker with Magnetic Legs VanKel (Varian) Style
    Part Number Pack Size Enquire
    MAGWHT-VK Each

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

    OEM Part# 12-3056

  22. 3 Pronged Capsule Sinker, Uncoated Stainless Steel Vankel (Varian) Style

    3 Pronged Capsule Sinker, Uncoated Stainless Steel Vankel (Varian) Style
    Part Number Pack Size Enquire
    CAPWHT-SV Each

    3 Pronged Capsule Sinker Stainless Steel

  23. 3 Pronged Capsule Sinker with Magnetic Top VanKel (Varian) Style

    3 Pronged Capsule Sinker with Magnetic Top VanKel (Varian) Style
    Part Number Pack Size Enquire
    MAGWHT-VKTOP Each

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

    OEM Part# 12-3055

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

    O-Ring Sinker 316 stainless steel 11.8 x 25.8mm capacity
    Part Number Pack Size Enquire
    CAPWHT-S99 Each

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

  25. Time Release Capsule Sinker

    Time Release Capsule Sinker
    Part Number Pack Size Enquire
    CAPWHT-TR Each

    Time Release Capsule Sinker

    OEM Part# 302-9065-6

  26. Breath Film Sinker for Dissolution

    Breath Film Sinker for Dissolution
    Part Number Pack Size Enquire
    CAPWHT-PC Each

    Breath Film Sinker

  27. 8 Mesh Basket Sinker

    8 Mesh Basket Sinker for Dissolution
    Part Number Pack Size Enquire
    BSK008-01 Each

    8 Mesh Basket Sinker

    OEM Part# 302-9050-6

  28. 8 Mesh Basket Sinker Japanese Pharmacopeia Size

    8 Mesh Basket Sinker Japanese Pharmacopeia Size
    Part Number Pack Size Enquire
    BSK008-JP Each

    8 Mesh Basket Sinker Japanese Pharmacopeia Size

    OEM Part# 302-9066-6

  29. 8 Mesh Basket Sinker, with lid.

    8 Mesh Basket Sinker, with lid.
    Part Number Pack Size Enquire
    SNK008-VK Each

    8 Mesh Basket Sinker with lid VanKel (Varian) Style

    OEM Part# 12-3062

  30. 10 Mesh Basket Sinker, With Lid

    10 Mesh Basket Sinker, With Lid
    Part Number Pack Size Enquire
    SNK010-VK Each

    10 Mesh Basket Sinker with lid. Can be used with any dissolution tester


    OEM Part# 12-3060

  31. 40 Mesh Basket Sinker, With Lid

    40 Mesh Basket Sinker, With Lid
    Part Number Pack Size Enquire
    SNK040-VK Each

    40 Mesh Basket Sinker with Lid. Can be used with any dissolution tester.


    OEM Part# 12-3064

  32. Type 316 Stainless Steel Wire 0.6mm dia 15m Roll

    Type 316 Stainless Steel Wire 0.6mm dia 15m Roll
    Part Number Pack Size Enquire
    WIRESK-VK Each

    Type 316 Stainless Steel Wire

    OEM Part# 12-3000

  33. Custom weights and sinkers made to your specification

    Custom weights and sinkers made to your specification
    Part Number Pack Size Enquire
    CAPWHT-CUS Each

    Custom weights and sinkers made to your specification

  34. Felodipine Test Suspended Basket Apparatus

    Felodipine Test Suspended Basket
    Part Number Pack Size Enquire
    STABSK-VK8 Each

    Felodipine Test Suspended Basket apparatus for use with most dissolution testers. 8 Mesh, USP Standard with 10mm ID


    Vessel CoverDepth Gauge

  35. Stationary Basket Assembly, 10 Mesh

    Stationary Basket Assembly, 10 Mesh
    Part Number Pack Size Enquire
    STABSK-10 Each

    Stationary Basket Assembly, 10 Mesh. Includes basket and shaft


    Vessel CoverDepth Gauge

  36. Stationary Basket Assembly, 20 Mesh

    Stationary Basket Assembly, 20 Mesh
    Part Number Pack Size Enquire
    STABSK-20 Each

    Stationary Basket Assembly, 20 Mesh. Includes basket and shaft


    Vessel CoverDepth Gauge

  37. Stationary Basket Assembly, 40 Mesh

    Stationary Basket Assembly, 40 Mesh
    Part Number Pack Size Enquire
    STABSK-40 Each

    Stationary Basket Assembly, 40 Mesh. Includes basket and shaft


    Vessel CoverDepth Gauge

37 Item(s)

per page