| HS Code | 139313 |
| Softening Point Ring And Ball | 105 °C |
| Color Gardner | 1 |
| Acid Number | <1 mg KOH/g |
| Glass Transition Temperature Tg | 51 °C |
| Brookfield Melt Viscosity At 150 C | 1000 cP |
| Density At 25 C | 1.05 g/cm³ |
| Refractive Index At 20 C | 1.58 |
| Flash Point Cleveland Open Cup | 246 °C |
| Number Average Molecular Weight Mn | 600 |
| Weight Average Molecular Weight Mw | 800 |
| Bromine Number | <1 |
As an accredited Kristalex 3105SD Hydrocarbon Resin for High-Performance Hot-Melt factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Kristalex 3105SD Hydrocarbon Resin is supplied in 25 kg multi-wall paper bags, palletized and shrink-wrapped for safe handling and transport. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Kristalex 3105SD hydrocarbon resin, palletized, stretch-wrapped, and secured for safe high-performance hot-melt transport. |
| Shipping | Kristalex 3105SD hydrocarbon resin ships as pastilles in 20 kg bags or 500 kg flexible intermediate bulk containers, with bulk options available. It is not classified as dangerous goods for transport. Keep packaging sealed, dry, and away from heat sources to prevent caking and contamination during transit. |
| Storage | Store Kristalex 3105SD in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Avoid moisture and extreme temperatures; recommended storage below 50°C. Keep separate from oxidizing materials. Under proper conditions, shelf life is typically one year from manufacture. |
| Shelf Life | Shelf life is 5 years when stored in original, unopened packaging in a cool, dry place away from heat and sunlight. |
In corrugated case and carton sealing lines where gear pumps deliver adhesive to slot nozzles at line speeds from 80 m/min to 120 m/min, Kristalex 3105SD is compounded with ethylene-vinyl acetate copolymers containing 28 wt% vinyl acetate at a resin addition of 30–40 wt%, with the heavier side of the range used for high-speed carton closure to keep open time below 5 s. The formulation is processed in a twin-screw extruder having an L/D ratio of 36:1 and barrel zones held at 140–160 °C, after which the melt is transferred to a heated tank at 160–170 °C and metered by a gear pump through a slot nozzle with a gap of 0.2–0.5 mm. Viscosity at 175 °C is controlled within 900–1,400 mPa·s when measured by ASTM D3236-15, and ring-and-ball softening point remains near 105 °C under ASTM E28-18. Indirect food-contact suitability for case sealing is assessed against 21 CFR 175.105, with the converter side of the operation following EU Regulation 1935/2004/EC and EU Regulation 2023/2006/EC good manufacturing practice provisions for food-contact materials. On production lines running above 80 m/min, the primary processing boundary is thermal oxidation in unblanketed melt tanks when temperature exceeds 180 °C; this condition produces char fines that block nozzle slots and creates intermittent fiber-tearing failure on recycled corrugate. Headspace nitrogen blanketing at 2–4 L/min and maintenance of tank fill above 60% volume reduce the defect rate. Finished terminal products are corrugated case sealing, carton closure, tray forming, and wrap-around sleeve bonding for dry goods and frozen-food secondary packaging.
| Segment | Standard designation | Control focus |
|---|---|---|
| Indirect food-contact case sealing | 21 CFR 175.105 | Adhesive migration boundaries for food packaging |
| Hot-melt viscosity | ASTM D3236-15 | Apparent viscosity of hot-melt adhesives |
| Resin softening point | ASTM E28-18 | Ring-and-ball softening point |
| Hygiene skin-contact conversion | ISO 10993-5:2009, ISO 10993-10:2021 | Cytotoxicity and irritation evaluation for medical-grade nonwovens |
| PSA loop tack | ASTM D6195-03(2019) | Loop tack of pressure-sensitive adhesives |
| PSA 180° peel | ASTM D3330/D3330M-02(2010) | Peel adhesion of pressure-sensitive tape |
| Woodworking non-structural bond | DIN EN 204:2016 | Classification of thermoplastic wood adhesives |
| Automotive VOC/FOG | VDA 278:2011 | Thermal desorption analysis of organic emissions |
| REACH | 1907/2006/EC | Chemical registration and SVHC control |
Slot die coating of nonwoven hygiene construction adhesives at coat weights from 1.0 g/m² to 3.5 g/m² incorporates Kristalex 3105SD at 30–45 wt% in styrenic block copolymer or amorphous polyalphaolefin formulas to modify cohesive strength and control cold-flow without raising hot-melt color. The melt is held at 145–165 °C and delivered through a heated hose at 150–160 °C to a slot die with lip gap 0.5–1.0 mm on a polypropylene spunbond substrate; typical line speeds range from 300 m/min to 600 m/min, requiring viscosity between 1,200 mPa·s and 2,500 mPa·s at 160 °C under ASTM D3236-15 to avoid misting and lip starvation. Skin-contact safety for standard hygienic articles is addressed through REACH 1907/2006/EC Annex XVII restrictions and absence of substances of very high concern at concentrations above 0.1 wt%; when the same nonwoven laminate is converted into medical-grade disposable articles, ISO 10993-5:2009 and ISO 10993-10:2021 are applied to demonstrate cytotoxicity and irritation compatibility. The process-limiting condition is low coat weight: below 1.0 g/m², narrow lip deposits accumulate oxidized resin at the die edge and produce discontinuous adhesive lines; above 3.5 g/m², excessive add-on increases stiffness and extends cool-down time, which is problematic in high-speed elastic bonding. Batch-to-batch Gardner color variation of the resin is held below 0.5 Gardner units because nonwoven yellowing becomes detectable at coat weights above 2.5 g/m² when the resin color exceeds that threshold. Terminal finished product types are diaper ear bonding, acquisition layer lamination, core stabilization, and elastic strand attachment in infant care and adult incontinence articles.
For pressure-sensitive label and tape formulations using styrenic block copolymer base polymers, the resin is placed at higher addition levels, typically 45–60 wt%, to increase shear hold without sacrificing loop tack when compounded with 10–20 phr of naphthenic mineral oil and a hindered phenolic antioxidant. The batch is mixed in a sigma-blade kneader at 150–170 °C until the resin is fully dispersed, then coated through a slot die at 15–25 g/m² onto a siliconized release liner and transferred to a face stock. Tape and label performance is verified by ASTM D6195-03(2019) loop tack and ASTM D3330/D3330M-02(2010) 180° peel, while the food-contact boundary for removable and permanent adhesive systems is governed by 21 CFR 175.125 and EU Regulation 1935/2004/EC for indirect application. At resin loadings above 55 wt%, the glass transition of the tackified block copolymer matrix rises, reducing cold-flow and edge ooze on die-cut labels, but the low-temperature peel at −10 °C becomes substrate-dependent; published data for this specific configuration is limited for freezer-grade film labels and must be validated on the intended face stock. The production-scale failure mode is edge ooze on finished rolls stored at ambient temperature above 30 °C when the resin loading exceeds 60 wt%, and the corrective action is to reduce the resin fraction or add a low-aromatic plasticizer. Terminal finished products are permanent clear labels, tamper-evident packaging tape, carton sealing tape, and removable promotional label constructions that do not require freezer adhesion.
High-speed furniture edgebanding lines require the resin at 35–50 wt% in EVA or EVA/APAO blends where melt viscosity at 190 °C must remain between 25,000 mPa·s and 60,000 mPa·s under ASTM D3236-15 to prevent stringing and penetration into the panel core. Application occurs through a cartridge-fed edgebander with a pre-melt temperature of 170–190 °C and a roller or slot nozzle depositing a 200–400 µm film onto activated PVC or ABS edge tape; line speeds are typically 20–80 m/min, with the lower speeds used for high-gloss panels where re-melt distance must be minimized. The finished bond is classified under DIN EN 204:2016 as D2 or D3 depending on the panel's exposure to short-term water or high humidity during interior use, and the adhesive lot is controlled by ASTM E28-18 ring-and-ball softening point to limit viscosity drift. A process boundary emerges when the melt temperature exceeds 200 °C: the high boiling point of the resin does not eliminate carbonization at the edgebander pre-melt surface over extended weekend shutdowns, so startup purging with fresh flakes is required to eliminate black specks on white melamine panels. Terminal finished product types are furniture edgebanding, profile wrapping of window and door lineal components, and laminated cabinet edges.
In automotive interior assembly where robot-mounted bead nozzles apply hot-melt to polyolefin and vinyl-covered substrates at 150–170 °C, Kristalex 3105SD is used at 25–40 wt% in APAO or EVA formulations to reduce total VOC and fogging risk relative to solvent-borne contact adhesives. The open time on a heated substrate at 20–25 °C ranges from 60 s to 120 s, and the final adhesive layer is compressed at 0.2–0.5 MPa for 10–20 s before parts are moved to trim assembly. Volatile emission is measured by VDA 278:2011 thermal desorption analysis, with typical lot-control thresholds below 50 µg C/g for total VOC and below 250 µg C/g for fogging in non-skin-contact trim; REACH 1907/2006/EC Annex XVII remains the regulatory boundary for restricted aromatic content. The principal production constraint is not chemical compatibility but thermal drift: holding the melt above 170 °C for more than 8 h shifts viscosity upward by 8–12% and increases the fogging fraction, so reservoir volume is sized to consume one shift of adhesive without thermal recharge. Terminal finished products are door inner-panel reinforcement, instrument panel skin attachment, speaker grille bonding, and roof liner stiffening tapes.
Bookbinding spine and side-glue stations operate with Kristalex 3105SD added at 30–45 wt% to EVA-based formulas that must build strength within an open time of 3–10 s after wheel or extrusion application at 140–160 °C. The hot-melt is applied to the spine and side joints in a single pass; excess is removed by a notched scraper, and the bound block is nipped until the adhesive sets. Process control uses ASTM D3236-15 viscosity at 150 °C and ASTM E28-18 ring-and-ball softening point as incoming lot criteria, while ISO 9001:2015 traceability links adhesive batches to specific book runs. Archival life of the finished bound product is influenced more by paper permanence than adhesive chemistry; when end-product durability is specified, ISO 20494:2017 applies to the paper component rather than the adhesive layer. The primary limitation on the production floor is dust accumulation from paper cutting: at paper dust loadings above 2 wt% of the melt, open-time shortens because mineral filler and fiber fines act as nucleating sites, so inline melt filters of 100–150 µm are required to protect the applicator wheel. Published data for this specific resin in bookbinding is limited; selection is normally confirmed through application trials on the target paper grade rather than predictive modeling. Terminal finished product types are perfect-bound paperback books, magazines, catalogs, and notepads.
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Kristalex 3105SD Hydrocarbon Resin is a low-molecular-weight, water-white aromatic hydrocarbon resin specified for high-performance hot-melt adhesive compounding. The manufacturer’s published data sheet lists a nominal ring-and-ball softening point of 105 °C under ASTM E28 and a Gardner color below 1 in a 50 % toluene solution under ASTM D1544. Melt viscosity is typically reported in the range of 1,000–1,500 mPa·s at 150 °C under ASTM D3236, with density of 1.07 g/cm³ at 25 °C under ASTM D4052. The resin has an acid number below 1 mg KOH/g under ASTM D465, which distinguishes it from rosin ester tackifiers that typically carry acid numbers from 8 to 20 mg KOH/g. In styrenic block copolymer hot-melt systems, Kristalex 3105SD functions primarily as a styrene end-block reinforcing resin rather than as a mid-block diluent. This phase preference increases cohesive strength and upper service temperature, but it also shifts melt rheology and open time when compared with 95 °C softening point aliphatic resins.
The solid grade is used in low-odor packaging adhesives, pressure-sensitive label adhesives, and high-temperature assembly hot melts where retention of shear adhesion above 60 °C is required. In continuous production, the resin is dry-blended with SIS or SBS polymer, mineral oil, antioxidants, and optional propylene-based waxes before entering a corotating twin-screw extruder. Processing conditions depend on the surrounding formulation, but the product is generally plasticated between 150 °C and 180 °C to avoid excessive melt viscosity while limiting thermo-oxidative color development.
| Property | Test method | Representative value |
|---|---|---|
| Softening point, ring-and-ball | ASTM E28 | 105 °C |
| Color, Gardner in 50 % toluene | ASTM D1544 | < 1 |
| Density at 25 °C | ASTM D4052 | 1.07 g/cm³ |
| Melt viscosity at 150 °C | ASTM D3236 | 1,000–1,500 mPa·s |
| Acid number | ASTM D465 | < 1 mg KOH/g |
| Flash point, Cleveland open cup | ASTM D92 | > 230 °C |
Substitution of a 95 °C C5 aliphatic tackifier with Kristalex 3105SD in a continuous hot-melt line typically raises the minimum plastication temperature by 10–15 °C. On a corotating twin-screw extruder with an L/D ratio of 40:1 and barrel zones set at 120 °C, 140 °C, 160 °C, 175 °C, and 180 °C, the aromatic resin requires the third and fourth zones to remain above 160 °C to prevent viscosity spikes at the gear pump inlet. If the feed throat is operated below 90 °C, solid particles may bridge at the hopper slide gate because the resin does not soften sufficiently until its 105 °C ring-and-ball point is approached. In production-scale runs, screw speeds above 350 rpm without a corresponding increase in zone 2 temperature to 160 °C have been associated with 3–5 % reduction in throughput due to incomplete melting and higher backpressure.
Melt viscosity in the low-shear region near the gear pump inlet is the critical bottleneck. At 130 °C, viscosity can exceed 15,000 mPa·s, which approaches the suction limit of a 2.5 cm³/rev gear pump if inlet pressure falls below 0.2 MPa. Raising the bulk melt temperature above 190 °C to compensate is not straightforward, because Gardner color can shift by more than 1 unit over 24 h in an open melt bath. Slot-die coating operations therefore maintain melt temperature between 160 °C and 180 °C, and the recirculation loop is kept below 185 °C to limit color drift while preserving wet-out on polyethylene or polyester facestocks.
Formulation practice in SIS-based hot-melt pressure-sensitive adhesives uses Kristalex 3105SD at loadings between 30 wt% and 45 wt% of total formulation. At 40 wt% resin in a system containing 25 wt% SIS and 35 wt% mineral oil, the compounded adhesive softening point commonly shifts to 90–95 °C, which is below the neat resin value because oil partitions into both the rubber and styrenic phases. Incoming lot inspection should include ASTM E28 softening point and ASTM D1544 color. Batch-to-batch softening point shifts above 2 °C correlate with open-time variation and inconsistent transfer to silicone release liners on high-speed label coating lines at 200 m/min and coat weights near 15 g/m². The resin performs in SIS, SBS, and SEBS formulations, but phase separation may occur when loading exceeds 50 wt% in low-styrene SBS grades because the aromatic resin overloads the styrene domains and reduces cohesive continuity.
Differences from other product classes are most evident in end-block reinforcement, acid functionality, and moisture resistance. C5 aliphatic resins are primarily mid-block tackifiers; they plasticize the isoprene or butadiene phase and enhance low-temperature tack. In contrast, Kristalex 3105SD raises the glass transition temperature of the styrene phase and improves high-temperature shear adhesion. In screening studies with 25 % SIS, 35 % oil, and 40 % tackifier, the aromatic hydrocarbon resin typically raises shear adhesion failure temperature by 5–10 °C relative to a C5 resin at equivalent softening point. Compared to rosin ester tackifiers, the hydrocarbon resin has an acid number below 1 mg KOH/g, which avoids ester hydrolysis under high-humidity storage and reduces viscosity drift during extended heating. Rosin esters may provide higher specific adhesion to polar substrates, but their ester linkages can contribute to moisture uptake and long-term viscosity movement. The comparison below summarizes commonly observed differences across resin classes.
| Attribute | Kristalex 3105SD aromatic hydrocarbon resin | C5 aliphatic resin | Rosin ester tackifier |
|---|---|---|---|
| Softening point range | 105 °C | 90–110 °C | 80–105 °C |
| Acid number | < 1 mg KOH/g | < 1 mg KOH/g | 8–20 mg KOH/g |
| Aromatic content | High | Low | None |
| Predominant compatibility in SIS/SBS | Styrene end-block reinforcement | Rubber mid-block plasticization | Polar substrate adhesion and mid-block interaction |
| Moisture uptake | Low | Low | Moderate |
| Thermo-oxidative color shift at 180 °C | Low to moderate with stabilizer | Low after hydrogenation | Moderate to high without stabilizer |
Published comparative data for exact shear adhesion failure temperature values vary with polymer grade, oil content, and coating condition. The ranges shown above reflect formulation screening rather than a universal performance guarantee. End-block reinforcement is also observed in hydrogenated aromatic resins, but Kristalex 3105SD is selected where a 105 °C softening point and low Gardner color are required without moving to a fully hydrogenated C9 platform.
Kristalex 3105SD is used in low-odor hot-melt applications where the adhesive is held in a bulk melter at 170–180 °C for 8–12 h. The resin’s low monomer and volatile content reduce vapor-phase odor in packaging lines, but antioxidant protection remains necessary because aromatic hydrocarbon resins can develop color and acidity under oxygen ingress. Nitrogen blanketing of bulk melters at 0.05–0.10 MPa positive pressure extends color stability. In a 24 h heat-aging test at 180 °C without nitrogen, Gardner color typically moves from below 1 to 1–2, and melt viscosity can increase by 10–20 % if the antioxidant package is depleted. The product is supplied as a stabilized solid grade; the manufacturer’s safety data sheet should be reviewed for exact stabilizer loading and handling conditions.
For food-contact hot melts, compliance is assessed under 21 CFR 175.105 as an adhesive component; Kristalex 3105SD is not intended as a direct food additive. REACH registration status and the absence of substances of very high concern above 0.1 % should be confirmed from the supplier’s extended safety data sheet. Under EU Regulation 1272/2008, the resin is generally not classified as dangerous for supply in the form shipped. RoHS compliance under Directive 2011/65/EU is based on absence of regulated heavy metals above threshold limits, and lot-level certificates should be retained for electronics-adjacent assembly adhesives.
Operational boundaries should be observed when blending with metallocene polyolefins or ethylene-vinyl acetate copolymers. Kristalex 3105SD is incompatible with highly crystalline isotactic polypropylene if melt blending is attempted below 180 °C, because the aromatic resin plasticizes only the amorphous phase and can generate haze. In polyolefin modification, 5–15 wt% addition is typical; higher loadings reduce Charpy impact strength. Avoid prolonged heating above 210 °C in the presence of chlorinated paraffins, because dehydrochlorination may accelerate color formation. Pre-drying is not normally required at ambient relative humidity below 60 %; if condensation occurs on solid resin after cold storage, a 40 °C forced-air drying step for 2 h is adequate to prevent steam bubbles in the melt. Published data for high-speed diaper lamination with this specific resin is limited; end-use validation under actual line speed, coat weight, and substrate tension conditions remains necessary.
