Product Info

Product Information

Suitable for imaging and qPCR

Heat Sealing offers a 100% effective method for plate sealing for a complete seal integrity, as well as being quick and cost effective.

Our Clear Weld Seal Mark II is an optically clear polymer film forming a permanent seal to polypropylene plates. The optical clarity of this seal enables its use for sealing plates required for imaging use, including fluorescent detection methods such as qPCR and colorimetric assays. The Clear Weld Seal Mark II forms a complete seal to a plate, enabling both low and very high temperature uses, including low temperature storage and high temperature incubations.

This seal is suitable for PCR/qPCR, even without the use of a pressurised heated lid, and is 100% effective when used in water bath thermal cyclers. The permanent nature of this 100% effective seal renders it suitable for the storage and disposal of hazardous material. Clear Weld Seal Mark II demonstrates a good solvent resistance and can be utilised for long term compound storage. Samples can be accessed by pre piercing with a blade, needle or our Pierce Plate (4ti-0398).

It is available as sheets, for use with manual and semi-automated sealers, such as our 4s3™ Sheet Heat Sealer, and in multiple roll formats compatible with specified automated heat sealers, such as our a4S Roll Heat Sealer.


Seal Features

  • Permanent seal
  • Non-sterile as standard; can be sterilised upon request
  • Seals polypropylene plates
  • Compatible with water bath thermal cyclers
  • Seal integrity range: -80°C to 110°C
  • Suitable for PCR and qPCR, and long term storage
  • DMSO and solvent resistant
  • Free from DNase, RNase, and human genomic DNA, bacterial cell, eukaryotic cell, dust, endotoxin/pyrogen free
  • Sheet dimensions: 125 x 78 mm, to fit all standard SBS footprint PCR and qPCR plates, microplates, assay and storage plates, from 12 well to 1536 well
  • Available in a variety of roll dimensions, to suit your choice of automatic heat sealing equipment
  • Autoclavable (121°C)*

* Once autoclaved, not recommended for PCR applications.


Our Clear Weld Seal Mark II is also available with our FrameSeal™ technology, a disposable, rigid, plastic frame perfect for use with a robotic gripper to be used within an automation cell. Click here for more information about our FrameSeals™.







4ti-0573 Clear Weld Seal Mark II, roll (610 m x 78 mm, approx. 5,000 seals)¹ 1 roll
4ti-0573/122 Clear Weld Seal Mark II, roll (122 m x 78 mm, approx. 1,000 seals)¹ 1 roll
4ti-0573S Clear Weld Seal Mark II, sample roll (5 m x 78 mm)¹
1 sample roll
4ti-0574 Clear Weld Seal Mark II, roll (500 m x 115 mm)² 1 roll
Clear Weld Seal Mark II, sample roll (5 m x 115 mm)² 1 sample roll
4ti-0575** Clear Weld Seal Mark II, sheets (125 x 78 mm) 100 sheets
4ti-0575/FS Clear Weld Seal Mark II FrameSeal™, stackable heat seal frames 50 frames

¹Compatible with 4titude® a4S Automatic Roll Heat Sealer / Thermo Fisher ALPS 300™ and ALPS 3000™ / KBiosystems Wasp™ / KBioscience FlexiSeal and Cube

²Compatible with Agilent (Velocity 11) PlateLoc®

** Seals are inter-leaved with paper sheets. This helps to denote which side is the sealing side, plus aids removal of one sheet at a time from the pack.

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