MATERIALS | PVC PLASTICISERS
Table 1: Representative data for medical grade PVC films comparing Citroflex B-6 plasticiser from Vertellus with DEHP. Formulation comprises 50 phr plasticiser, 2.5 phr stabiliser, 0.25 phr lubricant.
Hardness, Shore A Tensile Strength, MPa Ultimate Elongation, % 100% Modulus, MPa Brittle Point, °C
Volatile loss (air), % Volatile loss (A/C), %
Soapy water extraction, % Source: Vertellus
DEHP 79
18.95 395 9.43 -24.5 4.8 3.4 2.7
Citroflex B-6 81
20.16 427 9.39 -33.5 1.7 1.4 2.2
Citroflex B-6 is a butyryl trihexyl citrate (BTHC), which is listed in the European Pharmacopoeia as an approved alternative to DEHP for medical products. Vertellus says it enables brand owners to comply with various regulatory mandates — not only the MDR and REACH Regulations but also RoHS EU Directive 2015/863 (RoHS 3). PVC films plasticised with Citroflex B-6 are said to display similar physical properties to those containing DEHP – Figure 4.
Combined efforts With considerable experience in the bio-based plasticisers market in the US and South America, Innoleics USA and Varteco have recently agreed to combine their efforts to introduce Innoleic bio-based primary plasticisers into the European, North African, and Middle Eastern markets. Innoleics has plasticiser production agreements
with third parties in South America and offices in the US and Europe.
Its Innoleic plasticisers are acetylated and
Figure 4: Dynamic rheology temperature ramp data for PVC films containing Citroflex B-6 from Vertellus against other commonly used plasticisers. Formulation comprises 70 phr plasticiser, 2.5 phr stabiliser, 0.25 phr lubricant. Source: Vertellus
epoxidized soybean oil fatty acids esters with a high bio-based carbon content (as determined by 14C analysis and certified under the USDA BioPre- ferred programme). Varteco has two production sites in Argentina, as well as offices in Spain. It has recently certified its San Luis production site with the Round Table for Sustainable Soy Chain of Custody Standard, which ensures zero deforestation from soybeans used in its production process. The Innoleic plasticiser portfolio includes: Innoleic E1, a fast-fusing plasticiser developed as
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