Evonik VESTAMID® L2170 orange E20005 is a color-compounded polyamide 12 extrusion grade based on the VESTAMID L2170 base resin. The E20005 suffix designates an orange colour formulation within Evonik’s colour-index system; it is not a separate mechanical grade, although pigment and stabiliser loading can shift flow behaviour, elongation at break, and weathering response relative to the natural grade. Polyamide 12 is a semi-crystalline aliphatic polyamide polymerised from ω-aminododecanoic acid or laurolactam. The longer alkane sequence between amide groups reduces amide density and produces lower equilibrium water uptake than PA6 and PA66. The grade is typically specified where high-visibility orange tubing, pneumatic line, or protective jackets must remain dimensionally stable in humid service. Published datasheet values for the orange E20005 variant should be confirmed against the batch certificate because colorant loading can affect release properties.

What Are the Standard Mechanical, Thermal, and Moisture-Uptake Anchors for PA12 Extrusion Grades?

Values in the table are polymer-class comparative ranges from published technical literature, not grade-specific QC limits for VESTAMID® L2170 orange E20005. The orange pigment and heat-stabiliser package may shift tensile elongation and impact values; batch release values and the product-specific certificate of analysis govern.

Because E20005 is a pigmented colour formulation, the melt-volume rate and melt filtration behaviour of the orange grade may differ from natural L2170. Production-scale tube lines that process pigmented PA12 grades often qualify each lot with a screen-pack pressure-rise test or a constant-rate extrusion trial, because pigment agglomerates above a critical size are not reliably detected by a standard melt-volume rate instrument. The absence of complete published data for this specific colour compound leaves a qualification gap that must be closed by first-article trials on the intended line.

When Drying Deviation and Melt-Temperature Drift Limit Extruded Tube Quality

Polyamide 12 hydrolysis is a process boundary rather than a part-failure event. Residual moisture above 0.10% entering the melt phase at temperatures above 240 °C can reduce molecular weight, create surface roughness, and lower burst strength in extruded tube. Desiccant drying at 80–90 °C for 4–6 h with a dew point no higher than -30 °C is the standard precondition for VESTAMID L2170. If warehouse relative humidity exceeds 60%, open bags should be reclosed or consumed within 2 h to prevent moisture regain. The hopper throat should be blanketed with dry air or nitrogen if ambient humidity is extreme.

Single-screw extrusion lines with grooved feed zones and L/D ratios of 25:1 to 30:1 are appropriate for a PA12 tube grade. Barrel profile from 190 °C at the feed zone to 230–245 °C at the metering zone controls melting while limiting melt-temperature overshoot. Head and die temperatures are typically held at 220–235 °C. Melt temperature above 260 °C or residence time above 10 min degrades the orange E20005 pigment; visible signs include brown streaks and gel formation in the extrudate. On a 45 mm grooved-barrel extruder producing tube at 10 mm outer diameter, melt-pressure variation at the breaker plate larger than ±10 bar at constant screw speed typically indicates screen-pack fouling, pigment agglomeration, or unstable feed. Wall-thickness variation in the finished tube can then exceed 0.10 mm, which is a dimensional nonconformance for many pneumatic-line specifications.

When injection moulding this grade, barrel temperatures from 220 °C to 250 °C and mould temperatures from 40 °C to 70 °C are common for semi-flexible PA12. Mould temperatures below 30 °C generate rapid skin solidification and can produce jetting and weld-line visibility in high-chroma orange parts. Holding pressure should be set so that shot-weight variation remains below 0.3% across 25 consecutive cycles.

Comparative Moisture Uptake and Low-Temperature Performance Against PA6, PA66, and PBT

PA12 absorbs approximately 1.5% water at saturation, whereas PA6 and PA66 absorb 9.5% and 8.5% respectively under the same immersion condition. In conditioned air at 23 °C and 50% relative humidity, PA12 typically reaches 0.7–0.9% moisture, while PA6 and PA66 reach 2.5–3.0%. This lower moisture gain results in better retention of tensile modulus and dimensions in humid industrial environments. Under ISO 1110 accelerated conditioning, the stiffness loss of PA6 and PA66 can exceed 40% from the dry to conditioned state; PA12 generally loses less than 20%.

Low-temperature impact is a further separation point. Semi-flexible PA12 extrusion grades commonly retain ductile or partial-break behaviour down to -40 °C in notched impact testing, while dry PA6 and PA66 can exhibit brittle failures at temperatures below 0 °C. PBT has lower moisture absorption but lower low-temperature ductility than PA12; it is less suitable where repeated flexure at sub-zero temperatures is required. The PA12 molecular structure also provides better resistance to zinc chloride and calcium chloride stress cracking, which is relevant for automotive underbody lines exposed to de-icing salts.

For pneumatic and air-brake tubing, PA12 grades are evaluated against dimensions and burst requirements in specifications such as SAE J844 or DIN 73378. The VESTAMID L2170 orange E20005 material is not a complete certified hose system; it must be qualified in the final tube construction, including any inner conductive layer or outer protection, against the applicable OEM line specification. Published data for this specific coloured configuration in multilayer fuel or vapour lines is limited.

Regulatory compliance depends on the exact pigment and stabiliser formulation in E20005. Documentation should verify conformity with Directive 2011/65/EU RoHS Annex II restrictions and with Regulation 1907/2006/EC REACH Article 33 SVHC disclosure duties. For applications involving food-contact, potable water, or medical fluid pathways, no assumption of compliance can be made without grade-specific test evidence. The orange pigment system is intended for technical high-visibility identification; it is not a food-contact colourant unless explicitly confirmed by Evonik documentation.

Colour Stability, UV Resistance, and Regrind Discipline Are Linked Process Variables

The E20005 orange colorant system is selected for high visibility, but organic and inorganic pigments in orange concentrates can act as nucleating agents and can alter crystallisation kinetics. In PA12, this can produce a slight increase in crystallisation temperature and a narrower processing window for in-line dimensional control. Differential scanning calorimetry under ISO 11357-1/-3 should be used to compare the coloured compound with natural L2170 before setting cooling-tank temperatures. On production lines, regrind ratios above 20–25% can shift melt viscosity and reduce colour strength because polymer and pigment degradation accumulate more rapidly in a hot-runner or long-residence-time system. The typical recommendation is to keep closed-loop regrind below 20% for pigmented PA12 extrusion unless the line has been validated at higher ratios with a colourimeter and melt-pressure trend data.

Orange E20005 should be considered UV-stabilised only if the certificate of analysis or weathering data confirms stabilisation against ultraviolet exposure; not all colourants provide photostability. Outdoor exposure of unpainted PA12 can reduce surface gloss and increase yellowing. For high-visibility orange tubing used outdoors, the processor should verify QUV or xenon-arc data according to ISO 4892-2 or ASTM G155. Without such data, the operational boundary is indoor or protected-routing applications.