Nucleator BT Masterbatch
Switch PP from stiff to tough by the crystal route.
Nucleator BT Masterbatch makes polypropylene tougher and faster to mould. It changes the way PP crystallises as it cools, giving higher impact strength and shorter injection cycle times without losing much stiffness. Used in PP pipe, automotive parts, thin-wall containers and microporous film.
A beta-phase nucleating masterbatch for polypropylene, built on the nucleating additive dispersed on a PP homopolymer carrier. A low letdown in the final compound steers PP crystallisation from the default alpha spherulite to the metastable beta form. Beta-PP behaves like a different polymer: notched impact rises at low temperature, elongation at break climbs, heat distortion temperature shifts up and injection cycle times shorten. Used where ductility, impact and crystallisation control matter more than headline stiffness.
Specifications
Grade-specific values and Certificate of Analysis are provided on confirmed dispatch. Contact us to confirm the right grade for your application.
- Appearance
- White cylindrical pellets
- Active chemistry
- Beta-phase nucleating additive
- Carrier resin
- PP
- Recommended loading
- Varies by application; recommended dosage shared per grade
- Function
- Raises impact strength, toughness and cycle time in PP
- Packaging
- 25 kg PE-lined paper sacks
Key benefits
Higher impact strength
Beta-phase spherulites absorb energy as they deform, lifting notched Izod and drop-weight impact, even at low temperatures.
Stiffness with toughness
Holds flexural modulus and HDT high while adding ductility, so thin-wall parts resist cracking without warping.
Faster injection cycle times
Higher crystallisation temperature lets parts reach ejection stiffness sooner.
Microporous & breathable film
Controlled beta-crystal morphology opens uniform micropores when film is stretched, enabling breathable membranes and battery separators.
Applications
Frequently asked questions
What’s the recommended loading in PP?
Loading depends on the target property. For notched impact on PP block copolymer parts, a moderate dose is typical. For cycle-time reduction in injection moulded thin-wall parts where impact is secondary, a lower dose is often sufficient. For stretched microporous membrane film and breathable hygiene back-sheet, a higher dose is needed to ensure a high beta fraction before stretching. We confirm the dose against your PP grade and end-use targets.
How does a beta-phase nucleator change PP crystallisation?
Neat PP crystallises in the thermodynamically stable alpha (monoclinic) form. The nucleating additive presents a heterogeneous surface that matches the unit-cell geometry of the metastable beta (trigonal) crystal, so beta spherulites grow preferentially during cooling. Beta-PP absorbs impact energy through cavitation and shear yielding, so notched impact rises measurably at low temperature. Flexural modulus drops slightly, elongation at break climbs and heat distortion temperature shifts up.
Why does it shorten injection moulding cycle time?
The nucleator raises the crystallisation temperature on cooling, so the polymer solidifies higher up the cooling curve and the part reaches ejection stiffness sooner. This allows the mould to open earlier, cutting cycle time measurably on thin-wall PP injection mouldings at the same melt temperature. Faster, more uniform crystallisation also reduces post-mould shrinkage and warpage on flat parts.
Why use Nucleator BT in microporous film?
Microporous breathable film relies on the beta-to-alpha crystal transformation. Beta-nucleated PP cast film is stretched below the melt; beta crystals convert to alpha and the density gap between the two forms creates the pore network that breathes while staying water-tight. Loading is critical: too low gives no beta and no pores, too high gives weak film. We tune the active level with a tailored particle-size distribution for uniform pore size. Contact us for the recommended loading for your film specification.
Can I get a trial sample?
Yes. We supply 1-2 kg trial samples with a Certificate of Analysis. Share the PP grade and flow, end-use process (injection, pipe, film, sheet), property target (impact, cycle time, pore size) and any co-nucleator or stabiliser already in the base. We match the active level and ship within 5-7 days. Sample shipping is free within India; export samples available with freight at cost.
What’s the lead time?
Standard PP-carrier grades ship in 7-14 working days. Specially tuned grades for microporous film or high-flow injection grades with custom particle-size control take 3-4 weeks. We confirm an exact timeline at the quote stage and can pull production in for time-critical trials on request.