| HS Code | 229288 |
| Softening Point Ring Ball | 70 °C |
| Gardner Color 50 In Toluene | ≤ 1 |
| Density At 20 C | 1.02 g/cm³ |
| Melt Viscosity At 190 C | 300 mPa·s |
| Acid Value | < 0.1 mg KOH/g |
| Iodine Value | < 5 g I₂/100 g |
| Saponification Value | < 1 mg KOH/g |
| Flash Point Cleveland Open Cup | > 200 °C |
| Glass Transition Temperature Dsc | 35 °C |
| Refractive Index At 20 C | 1.52 |
| Weight Average Molecular Weight | 500 g/mol |
As an accredited NOVARES PURE 70 S Hydrogenated Resin for Transparent Adhesives factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | NOVARES PURE 70 S hydrogenated resin for transparent adhesives is supplied as pellets in 25 kg multilayer paper bags, palletized and wrapped. |
| Container Loading (20′ FCL) | 20′ FCL loading: palletized bags of NOVARES PURE 70 S are shrink-wrapped, evenly stacked, and secured to ensure safe, stable transport. |
| Shipping | NOVARES PURE 70 S is shipped as solid pellets in sealed bags or drums to preserve purity. Transport requires dry, ventilated conditions, away from heat and ignition sources. Standard non-hazardous chemical handling applies, with proper labeling and secure loading to prevent damage during transit. |
| Storage | Store NOVARES PURE 70 S in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep upright to prevent leakage and protect from moisture. Maintain moderate temperatures, avoid incompatible materials, and ensure good housekeeping. Follow label instructions and keep out of reach of unauthorized personnel. |
| Shelf Life | Shelf life is typically 2 years when stored in original unopened container in a cool, dry place away from heat and sunlight. |
| Addition level (wt%) | Brookfield viscosity at 160°C (mPa·s) | Loop tack, SS (N/25 mm) | SAFT (°C) | 180° peel on glass (N/25 mm) | Gardner color |
|---|---|---|---|---|---|
| 0 (control) | 3,200 | 18.5 | 52 | 24.2 | 1 |
| 15 | 5,400 | 15.2 | 61 | 26.5 | <1 |
| 25 | 8,600 | 12.8 | 69 | 28.1 | <1 |
| 35 | 14,200 | 9.1 | 78 | 23.7 | <1 |
| 40 | 21,500 | 5.3 | 86 | 18.4 | <1 |
| Application scenario | Food-contact standard | Adhesion test method | Safety/biocompatibility standard |
|---|---|---|---|
| Label stock HMPSA | FDA 21 CFR 175.105 | ASTM D4498, FINAT FTM 8 | REACH Annex XVII |
| Food flexible laminating | FDA 21 CFR 177.1520, EU 10/2011 | ASTM D1876, ISO 11339 | REACH Annex XVII |
| Transdermal medical matrix | Not applicable | USP <1724> | ISO 10993-5, ISO 10993-10, ICH Q3C |
| EVA edge banding | Not applicable | ASTM D4497, ISO 1924-2 | EN 204 D3 grade |
| UV-cured removable films | Not applicable | FINAT FTM 1, ASTM D3359 | ISO 2409 |
| Hygiene elastic lamination | Not applicable | ASTM D1876 | ISO 10993-23, OEKO-TEX Standard 100 |
Competitive NOVARES PURE 70 S Hydrogenated Resin for Transparent Adhesives prices that fit your budget—flexible terms and customized quotes for every order.
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NOVARES PURE 70 S is a hydrogenated hydrocarbon resin supplied as low-colour pastilles for transparent hot-melt, solventborne, and reactive adhesive systems. The model designates a 70 °C ring-and-ball softening point under ISO 4625-1; production certificates of analysis commonly show a range of 68–72 °C. The suffix S identifies a stabilised, low-odour grade within the PURE series. The product belongs to the NOVARES line of fully hydrogenated aromatic C9 resins and is used as a tackifier in ethylene-vinyl acetate, styrene block copolymer, and metallocene polyolefin packaging adhesives. Representative chemical data include a Gardner colour below 1 at 50 % solids in toluene under ASTM D1544, an acid number below 0.1 mg KOH/g by ASTM D974, and a density of 1.04–1.06 g/cm³ at 20 °C using ISO 1183-1. The resin is nonpolar and low in acidity, which makes it suitable for clear packaging lines where contact clarity and low odour are required; however, its performance limits are determined by the 70 °C softening point and by compatibility with polar polymer phases.
The principal difference from conventional aromatic C9 resins is the removal of most ethylenic unsaturation through hydrogenation. In clear packaging hot-melts, this alteration shifts the failure mode away from yellowing and odour generation. When film samples are aged at 150 °C in a forced-air oven for 72 h, class-level Gardner colour drift for fully hydrogenated C9 tackifiers commonly remains below 1 unit, while non-hydrogenated aromatic C9 resins often exceed 4 units under the same conditions. These values are not product-specific guarantees; they are intended as incoming-quality screening thresholds. For laminates, haze is measured by ASTM D1003 or ISO 14782 on 300 µm films drawn on a heated bar coater at 120 °C. Formulators should request a batch-specific Gardner colour after 24 h at 180 °C under ASTM D1544 if thermal stability is a release criterion, because bulk resin initial colour alone does not predict melt-holding drift.
| Property | Method | Representative value |
|---|---|---|
| Softening point, ring-and-ball | ISO 4625-1 | 68–72 °C |
| Colour, 50 % in toluene | ASTM D1544 | <1 Gardner |
| Acid number | ASTM D974 | <0.1 mg KOH/g |
| Density at 20 °C | ISO 1183-1 | 1.04–1.06 g/cm³ |
| Ash content | ISO 6245 | <0.1 % by mass |
| Physical form | Visual | White to pale-yellow pastilles |
An acid number below 0.1 mg KOH/g measured by ASTM D974 differentiates NOVARES PURE 70 S from rosin ester tackifiers, which typically contain 5–15 mg KOH/g of residual acidity. In polyurethane reactive hot-melt formulations, residual acid groups can accelerate isocyanate-water side reactions, generate carbon dioxide, and alter cure stoichiometry. The low-acid resin therefore allows compounding with moisture-cure prepolymers at loadings up to 10–15 wt% without the same degree of viscosity drift; above 20 wt%, the nonpolar nature of the resin can reduce optical clarity and should be screened by differential scanning calorimetry for a single combined glass transition under ISO 11357-2. In amine-neutralised waterborne systems, the resin does not contribute to pH drop or amine demand, which is relevant when the adhesive is used to bond clear polycarbonate or polyester film. Batch titration data should be retained because acid number is a release limit, not a formulation constant.
Food-contact status depends on the finished adhesive and the specific regulatory clearance claimed by the manufacturer. The product is frequently positioned for use in food-packaging adhesives under FDA 21 CFR 175.105 when the adhesive is separated from food by a functional barrier, but the exact end-use restriction must be confirmed in writing from the supplier for the production site and batch range. Regulatory compliance should not be inferred solely from a technical data sheet.
During continuous compounding on a 25 mm co-rotating twin-screw extruder with L/D 40, NOVARES PURE 70 S is side-fed downstream of the primary polymer feed. Barrel temperatures are set from 90 °C at the feed throat to 120 °C at the die, with the resin side-feeder zone held at 80–100 °C to prevent pastille bridging. At melt temperatures above 180 °C or residence times above 10 min, colour drift becomes detectable even in stabilised hydrogenated resins. Processing lines with poorly swept hot-melt tanks and nitrogen blanketing can maintain colour longer; without inerting, continuous low-shear storage at 160 °C should not exceed 8 h for clarity-critical products. The resin’s supplied pastille form permits gravimetric dosing into a loss-in-weight feeder, but the feeder hopper must be water-jacketed below 35 °C when ambient temperature exceeds 30 °C to prevent caking.
In slot-die coating of transparent hot-melts, melt filtration through a 100 µm screen pack is recommended before the positive-displacement gear pump. The resin’s low colour permits visual inspection of gel particles and char; however, low colour also reduces contrast for optical defect detection systems. To avoid spurious rejection, machine vision systems should be calibrated with a clear reference standard rather than a coloured resin. Melt viscosity at application temperature is best measured by ASTM D3236 with a Brookfield thermocell at 150 °C and 160 °C. Published neat resin melt viscosity for this grade may be given as a maximum rather than a fixed value; users should request a batch-specific flow curve if shear-thinning behaviour is critical for narrow slot dies.
The 70 °C softening point sets the upper service temperature of the neat resin but not of the finished adhesive. In an EVA hot-melt containing 30 wt% resin, 35 wt% polymer, and 35 wt% wax and diluent, the shear adhesion failure temperature under ASTM D4498 may pass only 50–60 °C depending on wax type and wax melting point. If a packaging adhesive must survive 70 °C under a 500 g static load, NOVARES PURE 70 S alone is often insufficient. The formulator must either reduce resin loading below 20 wt%, replace part of the wax with a higher melting point Fischer-Tropsch grade, or add a separate end-block reinforcing resin. Each of these changes trades away tack or clarity; the resulting haze should be measured by ASTM D1003, and low-temperature flexibility should be checked by mandrel bend at −10 °C or by low-temperature loop tack using ASTM D6195.
The advantage of the 70 °C softening point is improved substrate wetting and cold-tack on uncoated paperboard at line speeds above 50 m/min. Resins with softening points above 100 °C typically require higher application temperatures, which can scorch thin polyethylene films and increase odour. The 70 S grade allows melt application at 140–150 °C, reducing thermal stress on heat-sensitive facestocks. This is a genuine processing window but not a universal solution; if the filled package will be shipped in a truck container above 60 °C, heat resistance requirements override cold-tack benefits.
Class-level comparison of tackifier options for transparent adhesive screening:
| Parameter | NOVARES PURE 70 S | Conventional C9 aromatic resin | Rosin ester | C5 aliphatic resin |
|---|---|---|---|---|
| Softening point | 68–72 °C (ISO 4625-1) | 90–120 °C typical | 80–105 °C typical | 70–100 °C typical |
| Gardner colour at 50 % solids | <1 (ASTM D1544) | 4–8 typical | 3–8 typical | <1 typical |
| Acid number (mg KOH/g) | <0.1 (ASTM D974) | 0.1–0.5 typical | 5–15 typical | <0.1 typical |
| Residual bromine number (g Br/100 g) | <1 class-level (ASTM D1159) | 20–35 class-level | 10–25 class-level | <2 class-level |
| Film yellowing after 72 h at 150 °C | low; class-level Gardner shift <1 | high; Gardner shift often >4 | moderate; Gardner shift 2–5 | low to moderate; Gardner shift 1–3 |
In clear styrene-isoprene-styrene pressure-sensitive adhesives, NOVARES PURE 70 S is usually concentrated in the isoprene midblock. Midblock loading is set by the desired loop tack and peel adhesion; typical starting points are 20–60 phr on 100 phr SIS. Loop tack is measured by ASTM D6195, 180° peel by ASTM D3330, and shear adhesion failure temperature by ASTM D4498. At loadings above 60 phr, cohesive strength falls rapidly and the adhesive may leave residue on acrylic substrates. Below 20 phr, the formulation does not develop sufficient tack for low-energy surfaces such as untreated polypropylene. The hydrogenated nature of the resin reduces UV-induced chromophore formation in clear label adhesives; in laboratory screening with a xenon arc source per ISO 4892-2 at 0.55 W/m² for 340 nm, films containing hydrogenated C9 resin remain acceptable for longer than those containing terpene phenol, but exact delta b* values are system-dependent.
For automotive interior adhesives, emissions and fogging are tested by VDA 278 and VDA 270. Hydrogenated hydrocarbon resins typically show lower total volatile emissions than rosin esters and non-hydrogenated C9 resins, but product-specific data should be obtained from the manufacturer for each final adhesive. Published data for NOVARES PURE 70 S in every possible adhesive matrix is limited, so qualification should include a full factorial design with resin loading, mixing temperature, and cool-down rate as factors.
When replacing a conventional C9 or rosin ester in an existing transparent adhesive, the formulation cannot be qualified solely on resin colour. A side-by-side 7 day melt storage test at 150 °C with daily Gardner measurements by ASTM D1544 is a minimum. In waterborne pressure-sensitive adhesives, the resin is usually introduced as a solventborne or heat-melt preblend with the base elastomer; direct addition to aqueous latex can destabilise the dispersion. Storage life in unopened original packaging is typically 12 months when stored below 30 °C, but caking and colour drift are possible if the packaging is damaged. In storage, the pastilles remain free-flowing below 30 °C. At ambient temperatures above 35 °C, surface tack can develop and cause blocking. If bags are stored in uninsulated containers, product may reach 45 °C and fuse; therefore, pallet stacking should be limited to 2 high and bulk silos should be kept below 40 °C with low-speed rotary discharge. The resin is not classified as hygroscopic, but surface moisture from condensation at RH > 80 % can introduce bubbles in clear adhesive films. Pre-drying at 60 °C for 4 h in a shallow tray drier is sufficient when condensation is suspected. Avoid strong oxidising agents and open-flame contact; the material is combustible and should be handled according to the manufacturer’s SDS. For REACH and food-contact declarations, the operator must obtain a batch-specific regulatory statement from the manufacturer because resin-level data does not automatically transfer to the finished adhesive article.
