Optical brighteners for PVC foam board
Foam board yellows for two reasons at once - thermal stress during expansion and the intrinsic cast of the recycled fraction - and the brightener has to answer both without being consumed by the foaming agent.
What the grade has to survive
Four things that decide the choice
- Affinity for the soft PVC phase rather than the rigid one
- Tolerance of azodicarbonamide and other blowing agents
- Whiteness that holds after the board is cut and edged
- Dosage low enough not to green the surface
These are the constraints we work through with customers on this application. Everything on this page traces back to the published data for the grades listed below.
Grades for pvc foam board
Optical brightener FP-127
A methoxy-substituted distyryl biphenyl built for soft PVC.
Optical brightener OB
The workhorse of the benzoxazole family and the grade most plastics buyers are matching when their specification says Uvitex OB or Tinopal OB.
Optical brightener OB-1
The heat-resistance specialist.
Methyl Tin Mercaptide
A bright, clear liquid tin stabiliser for PVC processing, effective in both rigid and flexible compounds and notable for the transparency it leaves behind.
Background reading on pvc foam board
FP-127 for PVC Foam Board: High-Efficiency Optical Brightening Solution
oba for pvc foam board
Enhancing Whiteness and Performance with OBA for PVC Foam Board
PVC foam board is a widely used decorative and structural material known for its fire resistance, moisture resistance, weatherability, impact
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How to Choose the Right OBA for PVC ceiling board
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Related markets
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Coatings split cleanly into two camps. Oil-based and solvent systems take OB, which dissolves in the resin…
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Blown film
In film the brightener has to raise apparent whiteness without touching clarity, and it has to do…
Recycled plastics
Recyclate arrives with a yellow-grey cast that no amount of washing removes. A brightener is the…
Send us the pvc foam board brief
Substrate, process temperature, whiteness target and trial quantity. That is everything we need to name a grade.