| HS Code | 298398 |
| Softening Point Ring Ball | 95-105 °C |
| Color Gardner | 1 max |
| Acid Value | 0 mg KOH/g |
| Melt Viscosity At 150 C | 200-400 mPa·s |
| Density At 20 C | 0.96 g/cm³ |
| Glass Transition Temperature | 40-45 °C |
| Molecular Weight Mn | 400 g/mol |
| Molecular Weight Mw | 600 g/mol |
| Iodine Number | <1 g I2/100g |
| Flash Point | >200 °C |
| Refractive Index At 20 C | 1.51 |
| Thermal Stability | Excellent |
As an accredited NOVARES PURE 20 AS Hydrogenated Resin for PSA & Hot-Melt factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | NOVARES PURE 20 AS hydrogenated resin supplied as pastilles in 25 kg paper bags, designed for PSA and hot-melt adhesives. |
| Container Loading (20′ FCL) | 20′ FCL of NOVARES PURE 20 AS hydrogenated resin, packed in sealed bags on pallets, secured for safe transport. |
| Shipping | NOVARES PURE 20 AS ships as solid pastilles in heat-sealed, moisture-barrier bags inside sturdy cartons. Protect from prolonged heat and humidity to prevent caking. Store dry and ventilated. Not classified as hazardous under transport regulations, but avoid dust inhalation and contact with eyes. Keep away from strong oxidizers. |
| Storage | Store NOVARES PURE 20 AS in its original, unopened packaging in a cool, dry, well-ventilated area. Keep away from heat sources, open flames, direct sunlight, and oxidizing agents. Avoid moisture exposure to prevent caking or contamination. Maintain moderate temperatures, ideally below 30°C. Under these conditions, the hydrogenated resin retains its quality for PSA and hot-melt applications. |
| Shelf Life | Shelf life is typically 24 months from manufacture when stored unopened, dry, and below 35°C. |
In SIS block copolymer-based pressure-sensitive adhesive compounding, NOVARES PURE 20 AS is introduced at 20–30 wt% of the total formulation to reduce plateau modulus and raise room-temperature loop tack without generating the high-temperature volatility observed with C5 aliphatic resin grades. The resin’s designation indicates a nominal softening point near 20°C; supplier certificates of analysis typically report ring-and-ball softening point according to ASTM D36/D36M-14(2020) within 18–22°C. Bulk adhesive mixes are processed at 150–170°C in a 40:1 L/D twin-screw extruder or a jacketed Z-blade mixer. Production-scale slot-die coating lines running at 80–120 m/min require the finished adhesive to maintain an apparent viscosity below 5,000 mPa·s at 130°C to prevent chatter at the coating gap. Plant evaluation data associated addition above 35 wt% with shear holding times below a customer-specific limit under 1 kg load at 23°C; published data for this exact threshold is limited. Compliance for food-contact adhesive applications is governed by FDA 21 CFR 175.105 and 21 CFR 176.170 where the coated substrate is incorporated into paperboard packaging. Peel and tack properties are evaluated according to ASTM D6195-03(2019) and ASTM D903-98(2017) on 25 mm wide specimens bonded to stainless steel panels after 24 h conditioning at 23±2°C and 50±5% RH. Terminal products include biaxially oriented polypropylene carton-sealing tapes, PET labelstock for beverage bottles, and removable protective films for appliance surfaces.
Pre-blending of the liquid resin at 80°C before addition to the main mixer prevents localized torque spikes that appear in plant logs when cold resin contacts high-molecular-weight SIS. Batch-to-batch variation in tackifier pour point has been observed to move loop tack values outside the supplier-cited control band under ASTM D6195-03(2019); inbound resin viscosity at 25°C is therefore controlled within the range cited in the manufacturer’s certificate of analysis. Published data for the exact interaction between this resin grade and high-vinyl SIS in UV-curable PSA systems is limited.
EVA/APAO packaging adhesives accept NOVARES PURE 20 AS at 15–25 wt% to extend open time while maintaining a low Gardner colour number below 1 after 72 h thermal ageing at 180°C. Compounding is performed in a single-screw extruder with 24:1 to 30:1 L/D and barrel zones set at 150–175°C; the resin is metered into the molten polymer phase after the melting zone to limit thermal history. Viscosity is monitored by ASTM D3236-15 at 150°C, with upper control limits typically 4,000 mPa·s for high-speed bead dispensing at 500–1,000 application points/min in case and carton sealing lines. Heat-fail temperature measured according to ASTM D4498-07(2021) typically falls between 65°C and 80°C for formulations at 20 wt% addition. Above 25 wt% addition, blocking resistance of recycled corrugate decreases and fibre-tear failure rates become inconsistent; below 15 wt% the formulated adhesive may exhibit insufficient cold-temperature flex resistance at −20°C for refrigerated distribution. Published data for the exact blocking threshold with this resin in recycled corrugate is limited.
Thermal degradation above 200°C in application pots produces aldehyde odour and viscosity drift; extended pot hold beyond 8 h at 190°C is associated with char formation in conventional tank systems. Hot-melt tanks are purged with nitrogen at 0.05–0.10 MPa and melt level is maintained above the heating coil to reduce oxidative skin formation. Regulatory compliance for packaging adhesives uses FDA 21 CFR 175.105 and REACH Regulation (EC) No 1907/2006 Annex II safety data sheet obligations; when the adhesive is intended for use on paperboard for aqueous and fatty foods, FDA 21 CFR 176.170 applies to the finished board. Terminal products include sealed corrugated shippers, tray-formed beverage multipacks, and wrap-around carton closures.
Under spiral-spray nonwoven lamination conditions at 8–15 g/m² add-on weight, NOVARES PURE 20 AS is used at 20–35 wt% in SEBS/SIS block copolymer construction adhesives to reduce melt viscosity and improve penetration into low-basis-weight nonwoven substrates without increasing bleed-through. The production process commonly employs a 300–400 mm hot-melt coating head with a multi-port spiral nozzle operating at 140–160°C, heated air pressure of 0.10–0.15 MPa, and a web speed of 400–600 m/min. Maintenance logs from diaper converting lines show that premature gel formation in the nozzle filter occurs within 4–6 h if the resin is blended above 35 wt% with high-vinyl SIS due to localized shear heating. For skin-contact applications, finished nonwoven articles are assessed under ISO 10993-5:2009 and ISO 10993-10:2010 when classified as medical devices; for non-medical hygiene articles, conformity with REACH Regulation (EC) No 1907/2006 Annex XVII restrictions for polynuclear aromatic hydrocarbons is applied. Terminal products include disposable diaper chassis lamination, adult incontinence brief elastic attachment, and sanitary napkin pad bonding.
In high-speed converting, the process window for add-on weight is constrained by two failure modes: below 8 g/m², discontinuous adhesive filaments cause peel strength below 1.0 N/25 mm under ASTM D903-98(2017); above 15 g/m², strike-through becomes visible on the outer nonwoven sheet. Field data from production lines using 0.35 mm nozzle orifices show that the resin’s melt viscosity at 130°C must remain below 3,500 mPa·s to avoid fibre breakage in spiral-spray patterns. Filter pressure rise above 3.0 MPa within a shift indicates char or gel accumulation and requires shutdown for nozzle cleaning; published data for this specific resin under all nozzle geometries is limited.
Edge-banding hot melts accept NOVARES PURE 20 AS at 10–20 wt% in EVA or APAO polymers to increase surface tack retention after the 5–10 s open window typical of automatic edge-banding machines, with pre-melt reservoirs maintained at 170–200°C, roller application at 150–180°C, nip pressing at 0.3–0.6 MPa, and film weights of 150–250 g/m² on edge materials of 0.4–2.0 mm thickness. DIN EN 204:2016 and DIN EN 205:2016 provide classification and test protocols for non-structural wood bonds, while REACH Regulation (EC) No 1907/2006 Annex XVII and RoHS Directive 2011/65/EU apply to finished furniture electrical components. Terminal products include office furniture edge bands, kitchen cabinet doors, and profile-wrapped window profiles.
When interior trim bonding requires low-odour assembly adhesives, NOVARES PURE 20 AS is combined with SBC/APAO base polymers at 12–18 wt% to limit total VOC and FOG emissions while retaining assembly line bond strength on polypropylene and ABS substrates. Application temperatures of 140–170°C are maintained by heated hose and nozzle systems with ±2°C control; cold substrate temperatures below 10°C can reduce initial tack and require pre-warming to 18–25°C. Automotive interior material emission testing is conducted according to VDA 278:2011 thermodesorption analysis and VDA 270:2018 odour evaluation, with additional interior air chamber testing under ISO 12219-1:2012 where applicable. Batch-to-batch variation in low-molecular-weight species is a known field issue: production-scale suppliers track the VDA 278 VOC sum value for each resin lot and reject lots exceeding the agreed internal specification. Formulations above 18 wt% increase tack but can introduce odour values above 3 on the VDA 270 scale after 24 h at 80°C; published data for this specific resin at these exact odour thresholds is limited, so full assembly validation under OEM material standards is required. Terminal products include door panel insert adhesive, instrument panel trim bead, and interior pillar trim attachment.
Application engineering data from interior assembly lines show that open time is reduced from approximately 20 s at 150°C to 8 s when the substrate temperature falls to 10°C, which necessitates robot path adjustments on multi-panel fixtures. Process engineers specify heated hoses no longer than 3 m and nozzle temperatures not exceeding 160°C for continuous runs to avoid thermal stratification in the tank; thermal stratification above 10°C between tank and nozzle can cause viscosity variation exceeding 500 mPa·s, producing skip beads on long components. The absence of published long-term peel ageing data for this exact resin in low-odour SBC/APAO systems means that OEM CQAT validation remains batch-specific.
For perfect-binding lines operating at 6,000–12,000 cycles/h, NOVARES PURE 20 AS is included at 20–30 wt% in EVA-based spine and side adhesives to maintain low molten viscosity and high wetting into unprinted book blocks. The production process uses a twin-tank hot-melt system, with spine adhesive applied at 160–180°C and side adhesive at 150–170°C; application weight is controlled within 0.8–1.5 kg per 1,000 books for medium-format softcover runs. Compliance for paperboard packaging book formats intended for indirect food contact is addressed under FDA 21 CFR 176.170, while general adhesive safety documentation follows REACH Regulation (EC) No 1907/2006. Bond quality is measured by page pull and flex tests adapted from ASTM D1876-08(2015) T-peel methodology at 23±2°C and 50±5% RH. Field data from high-speed lines indicate that pot life at 170°C is typically 72 h before char formation raises the probability of nozzle blockage; mechanical filtration at 80–120 µm is recommended. Terminal products include softcover textbooks, magazines, catalogues, and wire-stitched brochures with adhesive-coated spines.
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NOVARES PURE 20 AS is a low-softening-point hydrogenated hydrocarbon resin supplied as a tackifier for pressure-sensitive adhesive (PSA) and hot-melt formulations based on styrenic block copolymers (SBC), ethylene-vinyl acetate (EVA), and amorphous poly-alpha-olefins (APAO). The product is differentiated from non-hydrogenated aromatic C9 resins by reduced residual unsaturation, which lowers Gardner colour, oxidative drift during high-temperature application, and odour release. Supplier-published specifications include a ring-and-ball softening point of 18–22 °C determined by ASTM E28 or ISO 4625-1:2020, a Gardner colour maximum of 1 measured on a 50 wt% toluene solution per ASTM D6166, and an acid number below 0.5 mg KOH/g per ASTM D974. The molecular weight distribution is controlled around a weight-average molecular weight of 400–600 g/mol, placing the resin in the plasticising-tackifier class rather than a high-softening-point reinforcing resin. At ambient temperature the material is a clear to pale liquid; bulk handling is normally conducted at 40–60 °C to reduce viscosity before meter-mixing into hot-melt extrusion lines.
On production-scale adhesive lines, the principal handling limitation is not melt viscosity but thermal regulation of downstream pelletising and casting equipment. Hot-melt compounders using co-rotating twin-screw extruders with 40:1 L/D and 25–40 mm screw diameters have observed that the resin, when added at 20–35 wt% to EVA-based packaging adhesives, lowers the melt temperature required for strand extrusion by 10–20 °C relative to a rosin ester tackifier of similar softening point. Strand pelletising requires chilled-water bath temperatures of 10–15 °C because the low softening point of the resin postpones compound solidification; pellet agglomeration is otherwise the limiting unit operation. The resin is fed by heated gear pump from a drum unloader set to 50 °C, with return-line pressure held below 2.0 bar to avoid pump cavitation.
Although hydrogenation reduces thermally induced colour shift relative to non-hydrogenated C9 resins, NOVARES PURE 20 AS still requires a defined thermal ceiling in continuous mixing. Holding the neat resin at 200 °C for more than 2 h produces measurable yellowing in Gardner colour toward 2–3; above 220 °C, released low-molecular-weight volatiles can generate bubbles in slot-die coated films. Thermogravimetric analysis of this resin class typically records 5% mass loss onset above 250 °C under nitrogen per ASTM E1131, but oxidative environments lower the practical stabilised ceiling. In hot-melt compounding, the melt is therefore maintained between 140 and 170 °C for continuous operation, with residence time below 45 min under nitrogen blanket. A hindered phenolic antioxidant at 0.5 wt% and a phosphite secondary antioxidant at 0.2–0.3 wt% are commonly added to stabilise the compounded adhesive during 8 h hold at 180 °C. The viscosity of the neat resin at 160 °C is typically 250–450 mPa·s by ASTM D3236 using a Brookfield RVDV-II+ Thermosel with SC4-27 spindle at 10 rpm; the shear rate dependence under a rotational rheometer at 1 s−1 is limited because of the low molecular weight.
Residence-time distribution in twin-screw compounding exerts a direct influence on the colour retention of the resin. In a 40:1 L/D co-rotating extruder with kneading blocks distributed over the first two-thirds of the barrel, melt temperature excursions above 190 °C are localised at the mixing elements; a barrel profile of 120/140/150/160/160/150 °C from feed to die is typical for EVA compounds containing 25 wt% NOVARES PURE 20 AS. In production runs, pellet agglomeration rather than screw torque has been the observed failure mode; if chilled-water temperature is not controlled below 15 °C, strand surface tack increases and the cutter section becomes fouled within 30–60 min. Rotational rheometer data for the neat resin between 120 and 180 °C show Arrhenius-like viscosity decay with an activation energy near 45–55 kJ/mol for low-softening-point hydrogenated tackifiers; this confirms the need for tight barrel temperature control rather than higher screw speed alone. Published data for the pure resin under high-shear slot-die conditions is limited; the processing window quoted here is derived from chemically analogous hydrogenated hydrocarbon resin grades used in EVA and SBC adhesive production. Verification should therefore be performed against a supplier certificate of analysis and a pilot-scale trial before line qualification.
In styrenic block copolymer PSA formulations, NOVARES PURE 20 AS is used at 40–70 phr relative to polymer, with aliphatic or naphthenic oil at 20–40 phr. The resin acts primarily as a low-Tg tackifier that softens the rubber mid-block and promotes interfacial wetting on untreated polyethylene and polypropylene substrates. In a model SIS/tackifier/mineral oil system coated at 50 g/m² on biaxially oriented polypropylene film, loop tack values determined by ASTM D6195 typically increase from 8 N/25mm to 18 N/25mm when the resin concentration is raised from 40 phr to 70 phr, while shear adhesion time per ASTM D3654 under a 1 kg load at 40 °C decreases accordingly. The precise plateau depends on block copolymer architecture, mid-block molecular weight, and oil aromaticity; published data for this specific resin grade is limited. Peel adhesion after 24 h dwell on stainless steel is commonly tested by ASTM D903 or ISO 29862 and should be expected to trend with coating thickness and substrate surface energy, not with resin loading alone. The resin’s low softening point contributes to probe-tack and loop-tack development but does not provide high-temperature shear strength; low-creep packaging applications therefore require a secondary reinforcing resin at 5–15 wt%, such as a hydrogenated dicyclopentadiene or high-softening-point C5/C9 copolymer.
Compatibility with SIS and SBS is generally high, but the low molecular weight depresses the plateau modulus of the styrenic network. Dynamic mechanical analysis of a typical PSA containing 50 phr NOVARES PURE 20 AS and 30 phr naphthenic oil shows a tan δ peak for the tackifier-rubber phase shifted to −10 to 5 °C, while the styrene glass transition remains near 90–100 °C. This phase behaviour is detected by ISO 6721-1 dynamic mechanical analysis in tensile mode. Formulators should not exceed a total tackifier-plus-oil loading that lowers the storage modulus below approximately 1×105 Pa at 25 °C if the adhesive is intended for shear-resistant applications; below this threshold, cohesive failure develops under 1 kg load in ASTM D3654 shear testing. Published data for the exact loss-modulus crossover of the specific grade is limited, but the thermal transition positions are consistent with hydrogenated aromatic resins of similar Mw and softening point.
| Property | NOVARES PURE 20 AS (hydrogenated low-softening-point) | Non-hydrogenated C9 aromatic resin | C5 aliphatic resin |
|---|---|---|---|
| Softening point (°C, ASTM E28) | 18–22 | 80–110 | 90–105 |
| Gardner colour (ASTM D6166) | ≤1 | 5–8 | 1–3 |
| Acid number (mg KOH/g, ASTM D974) | <0.5 | 0.5–1.0 | <0.5 |
| Brookfield viscosity at 140 °C (mPa·s, ASTM D3236) | 250–450 | 200–400 at 160 °C | 150–300 at 160 °C |
| Iodine value (g I₂/100 g) | <2 | 40–60 | 5–10 |
| Molecular weight (Mw, g/mol) | 400–600 | 800–1,200 | 1,000–2,000 |
When NOVARES PURE 20 AS is substituted for a standard non-hydrogenated C9 aromatic tackifier at equal weight loading in an EVA hot-melt, the most consistent differences recorded on pilot-scale slot-die coaters are lower melt colour retention, reduced stringing during adhesive transfer, and a lower plateau in dynamic mechanical damping between 30 and 60 °C. The product is not a direct drop-in for high-softening-point aromatic resins; the lower molecular weight reduces heat resistance. Replacement must be balanced with a mid-block-compatible reinforcing resin at 5–15 wt% to maintain creep resistance in hot-fill packaging. The substitution is best validated with ASTM D4498 shear adhesion at 50 °C and hot-tack peel testing on a commercial form-fill-seal line. In EVA packaging hot-melt systems, NOVARES PURE 20 AS is commonly combined with 28 wt% EVA containing 28% vinyl acetate, 15 wt% Fischer-Tropsch wax, 0.5 wt% antioxidant, and the balance resin. On a slot-die coating line running at 300–600 m/min, the adhesive is applied at 160–170 °C melt temperature and 50–100 μm coat weight. The low softening point improves wetting onto recycled board and polyolefin films, but open time and set speed are controlled more by the wax component than by the resin. The resin reduces melt viscosity by approximately 15–25% relative to a high-softening-point rosin ester at equal loading, as measured by ASTM D3236 at 160 °C. This viscosity reduction may allow the application temperature to be lowered by 5–10 °C, but it also reduces heat resistance; carton-sealing packages exposed to 50 °C require additional formulation adjustments. Bond strength is typically evaluated by TAPPI T 812 compressive strength and ASTM D1876 T-peel on standard corrugated stock, but published data for this resin grade in specific EVA formulas is limited.
In APAO-based sprayable hot-melt systems for hygiene assembly, the resin is used at 20–30 wt% with 5–10 wt% plasticiser and 1 wt% antioxidant. Published data for the specific configuration is limited; pilot trials on multi-bead spiral-spray applicators operating at 150 °C indicate that the product contributes to fibre tear development on nonwoven substrates within 24 h of bonding, but peel adhesion values are governed by coat weight and substrate basis weight. Melt viscosity at application temperature should be checked by ASTM D3236 because nozzle pressure can increase if the resin is blended with high-molecular-weight APAO above 30 wt% owing to phase incompatibility at low shear.
Replacement of a non-hydrogenated C9 aromatic resin by NOVARES PURE 20 AS is most technically justified where low colour, low odour, and low volatile organic compound release are acceptance-critical. Headspace gas chromatography according to VDA 278 or ISO 11890-2 can be used to compare residual volatile organic compounds; published data for this specific grade is limited, and comparison batches must be generated with the same adhesive formulation and coating weight. The hydrogenated resin shows lower aromatic unsaturation and therefore lower tendency to form coloured oxidation products during hot-melt circulation loops. This is measured indirectly by Gardner colour retention after 24 h at 180 °C per ASTM D6166 and by peroxide value changes per ISO 3960. When the adhesive is intended for food packaging, the final formulation must comply with FDA 21 CFR 175.105 and, if the adhesive may contact food directly, FDA 21 CFR 175.125. European food-contact compliance for migration is evaluated under EU 10/2011 with overall migration limits of 10 mg/dm², but compliance is formulation-dependent and cannot be certified from resin chemistry alone. The product is also expected to be registered under REACH and supplied with a safety data sheet containing exposure scenarios for industrial use.
Bulk storage is recommended at 5–30 °C in closed steel or stainless-steel vessels equipped with slow pad nitrogen blanketing. Prolonged heating above 60 °C during storage is unnecessary and increases colour drift; if viscosity increase is observed after cold shipping, the material should be gently warmed to 40–50 °C for no more than 24 h before transfer. The product is hydrophobic, but free water should be excluded because wet feed interferes with gear-pump suction and can produce steam bubbles in extruder barrels. Avoid intimate mixing with strong oxidising agents; avoid prolonged contact with copper or copper-alloy fittings above 180 °C because copper ions accelerate discolouration. Combination with amine-based crosslinking additives is not recommended because the resin is not reactive, but amine-catalysed systems may alter adhesive pH and accelerate ester linkages in certain rosin-ester co-tackifiers; such combinations should be evaluated by ASTM D974 acid-number tracking and Fourier-transform infrared spectroscopy of the compounded melt. The product is not formulated for direct skin contact and is not a cosmetic ingredient; industrial hygiene controls should follow the safety data sheet.
