Technical profiles

Lead and Calcium/Zinc stabilisers
Lead stabilisers are still widely used because of their processing latitude, good cost/performance ratio and outstanding heat stability.
Baerlocher has continuously developed the Calcium/Zinc systems to produce stabilisers which are not just equivalent but in some respects even superior to Lead formulations. The latest-generation Calcium/Zinc stabilisers offer good performance at considerably lower addition levels than Lead stabilisers or previous Calcium/Zinc systems.
In addition, the 2% lower density of a Calcium/Zinc-stabilised dryblend is a key consideration in the comparison of dryblend costs.
After introducing melt products of Lead stabilisers some time ago, Baerlocher’s efforts have lead to the first melt products of Calcium/Zinc stabiliser for PVC profile applications. The pastilles, formed by a melt process, are well approved for their various advantages. The production process of the so called TX products ensures highly homogeneous onepacks which can even include processing aid. The pastilles are not prone to abrasion during transport and conveyance, thus they are virtually no fines. The good flowability of the TX products facilitates dosage and handling of the stabilisers. Moreover, the pastilles possess superior silo storage ability. Baerlocher TX products are tailor-made for each customer and serve in white as well as coloured profile applications.

Weathering stability
Stabilisers for technical profiles are used in outdoor weatherable shutters and building profiles as well as in the extrusion of cable ducting and furniture profiles. The improved protective effect provided by Calcium/Zinc stabilisers is very clearly visible in dark-pigmented profiles. While dark-pigmented Lead-stabilised profiles gradually fade under the influence of weathering, Calcium/Zinc-stabilised profiles maintain their original colour much longer.