| HS Code | 247416 |
| Product Name | Covinax SMA-01 |
| Brand | Covinax |
| Model Number | SMA-01 |
| Product Type | SMA Coaxial RF Adapter |
| Connector Interface | SMA Male to SMA Female |
| Impedance | 50 Ohms |
| Frequency Range | DC to 18 GHz |
| Vswr | ≤ 1.2 |
| Insertion Loss | ≤ 0.3 dB |
| Body Material | Gold-plated brass |
| Contact Material | Gold-plated copper |
| Insulation Material | PTFE |
| Operating Temperature | -65°C to +165°C |
| Rohs Compliant | Yes |
As an accredited Covinax SMA-01 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Covinax SMA-01 is supplied in 25 kg sealed fiber drums with polyethylene liners, clearly labeled for safe chemical handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Covinax SMA-01: securely palletized, sealed drums, stabilized and blocked to ensure safe transport. |
| Shipping | Covinax SMA-01 ships in sealed, UN-approved containers, secured upright on pallets and protected from moisture. Use ventilated, temperature-controlled vehicles, keeping product below 30°C. Ensure proper hazard labeling, segregation from incompatible materials, and clear documentation including the Safety Data Sheet, per applicable chemical transport regulations. |
| Storage | Store Covinax SMA-01 in a tightly sealed, labeled container in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Maintain temperature between 15–25°C, protect from moisture, and keep separate from oxidizers, acids, and bases. Use appropriate PPE during handling, and avoid prolonged skin or eye contact. |
| Shelf Life | Shelf life is 24 months from manufacture date when stored in original sealed container at controlled temperature, protected from moisture and sunlight. |
On a puddle size press running 100% recycled linerboard at 250–450 m/min, partial replacement of oxidized starch with Covinax SMA-01 at 0.8–2.0 dry parts per 100 dry parts starch modifies the size-bath rheology and the dried film surface energy. Size-bath solids are maintained at 7–10 wt%, pH at 8.0–9.0 with ammonia, and temperature at 55–70 °C. The resin solution contributes anionic carboxyl groups that interact with cationic wet-end starch and calcium in the base sheet, reducing one-minute water absorption measured by ISO 535 or TAPPI T441 om-15. On metering size presses, shear stability of the size-bath mixture must be verified because insoluble calcium carboxylate complexes form when water hardness exceeds 150 mg/L as CaCO₃, leading to deposit build-up on applicator rolls and increased blade chatter. A conductivity check and softening of the size water are therefore required for extended run times. The resin is added pre-diluted to the starch cook after viscosity reduction; direct addition to a hot starch cook above 85 °C can cause localized gel particles that survive the size press and appear as surface deposits on the dry end. Exact nonvolatile solids and molecular weight distribution should be taken from the supplier certificate of analysis before setting the starch substitution ratio.
Aqueous flexographic ink systems use the ammonium-solubilized SMA resin as a letdown vehicle at 5–12 wt% of the varnish solids to improve pigment wetting, resolubility, and transfer from anilox cells. Press-ready ink viscosity is held between 22 s and 35 s through a 4 mm DIN cup at 25 °C, corresponding to pH 8.5–9.2. On a central-impression press running coated board at 150–250 m/min, the anilox specification is commonly 600–900 LPI and 3.0–4.5 BCM; the drying section is operated at substrate surface temperatures of 60–80 °C. Gloss is assessed by ISO 2813 at 60°. The principal process conflict is ammonia evaporation from the ink sump and return line at 35–40 °C, which depresses pH below 8.2 and reduces resin solubility, producing visible resin plate-out on the anilox roll and doctor blade. Press-side pH correction with a volatile amine blend is required every 4–8 h on high-speed lines. Foam generation is lower than conventional acrylic solution resins, but anti-foam addition may still be needed when circulation flow exceeds 30 L/min through a 200 L ink sump. For food-contact printed matter, the finished ink film must comply with the relevant nested packaging requirements; the specific approval status of the ammonium salt form should be confirmed against the current 21 CFR 176.170 and 21 CFR 176.180 listings for the intended food type.
Glass-lined emulsion polymerization reactors benefit from charging Covinax SMA-01 to the aqueous phase at 0.5–3.0 wt% based on total monomer as an electrosteric stabilizer. The aqueous phase is pre-neutralized to pH 8.5 with 28% ammonium hydroxide before monomer addition; pH is maintained between 8.2 and 9.0 during the 3–5 h monomer feed. Anchor impeller speed is set at 80–120 rpm, and the pre-emulsion is fed through a gear pump with a 45 µm in-line screen to monitor coagulum. Substitution of a portion of the anionic surfactant with the SMA resin reduces shear-induced coagulum during transfer and improves latex mechanical stability. Particle-size distribution is measured by dynamic light scattering according to ISO 22412:2017; target mean particle diameters for styrene-acrylic binders are typically 120–180 nm. The main operational boundary is pH drop caused by acidic monomers: if the reactor pH falls below 7.5, the SMA resin loses charge and can deposit on baffles and thermowells. Viscous seed formation can also occur if the resin is added directly to the monomer phase; it must be dissolved in the aqueous phase before pre-emulsion preparation.
Zinc ammonium carbonate additions to a styrene-acrylic floor polish emulsion containing Covinax SMA-01 at 5–15 wt% of total polymer solids create ionic crosslinks between zinc and pendant carboxyl groups from both the emulsion polymer and the SMA resin. The polish is formulated at pH 8.5–9.5; zinc is added slowly as a dilute solution to avoid local gel particles. Drying is carried out at 20–30 °C and 50–60% relative humidity, with recoat intervals of 20–40 min. Gloss at 60° is read according to ASTM D523; static slip resistance may be assessed by ASTM D2047. The crosslink density sets the balance between detergent resistance and alkaline removability: too little zinc keeps the film removable but lowers heel-mark resistance, while too much zinc produces a hard film that requires aggressive stripping with a 2–5% ammonia or monoethanolamine solution. The SMA resin contributes low-molecular-weight carboxyl density that accelerates crosslink formation, but its level must be controlled because high free carboxylic acid content increases water sensitivity of the dried film at relative humidity above 80%. Concentrate stability is checked by accelerated storage at 50 °C for 14 days; viscosity drift is measured with a Brookfield viscometer at 60 rpm and compared to the initial value. Published data for this specific configuration is limited; validation should be run on the target substrate and maintenance schedule.
In pigment dispersion, a horizontal bead mill charged with 0.6–0.8 mm yttria-stabilized zirconia media processes a 35–40 wt% organic pigment mill base at 8–10 m/s tip speed; Covinax SMA-01 is added at 12–20 wt% solids on pigment before grinding. The resin wets phthalocyanine blue and carbon black surfaces quickly, lowering mill-base viscosity and allowing higher pigment loading without exceeding the choke point of the mill screen pack. Fineness of grind is monitored according to ISO 1524:2013, with discharge targets below 5 µm. For carbon black grades with BET surface areas of 100–260 m²/g, the SMA resin dose is usually biased toward the upper end of the range to maintain dispersion stability during letdown into acrylic emulsions. Letdown is carried out gradually under low-shear agitation at pH 8.5–9.5; dropping below pH 8.0 can cause shock precipitation and grit formation above 25 µm. Overdosing above 25 wt% solids on pigment increases the acid number of the mill base and can reduce water resistance of the final ink or coating. The resulting concentrates are used in aqueous flexographic inks, decorative paints, and tinting pastes where volatile organic content must be kept below 30 g/L in the finished coating; compliance with ASTM D6886 or the relevant regional VOC method is confirmed on the letdown product.
| Downstream segment | Typical addition range | Operating pH | Primary test method |
|---|---|---|---|
| Surface sizing | 0.8–2.0 dry phr on starch | 8.0–9.0 | ISO 535 / TAPPI T441 |
| Flexographic ink | 5–12 wt% of varnish solids | 8.5–9.2 | ISO 2813 / ISO 2431 |
| Emulsion polymerization | 0.5–3.0 wt% of total monomer | 8.2–9.0 | ISO 22412:2017 |
| Floor polish | 5–15 wt% of polymer solids | 8.5–9.5 | ASTM D523 / ASTM D2047 |
| Pigment dispersion | 12–20 wt% solids on pigment | 8.5–9.5 | ISO 1524:2013 |
| Warp sizing | 5–15 wt% of dry size solids | 7.5–8.5 | ASTM D2256 |
| Remoistenable adhesive | 2–6 wt% of dry adhesive solids | 8.0–9.0 | ASTM D1876 |
On a single-end sizing line processing 40/1 Ne ring-spun cotton at 80–120 m/min, a size mixture of PVA, oxidized starch, and Covinax SMA-01 at 5–15 wt% of dry size solids is cooked in a jet cooker at 110–130 °C, then held in the size box at 80–90 °C and pH 7.5–8.5. Squeeze pressure is set at 10–20 kN/m across the nip, and drying cylinder surface temperatures are ramped from 110 °C to 130 °C. The SMA resin contributes film hardness and reduces hairiness during weaving; warp breaks per 100,000 picks are tracked on the loom as the primary production metric. Tensile strength and elongation of sized yarn are measured according to ASTM D2256; abrasion resistance may be checked by ISO 12947-2 or an equivalent yarn-to-yarn abrasion test. The dried size film must remain alkali-soluble for desizing: a scour with 0.5–1.0% sodium hydroxide at 70–80 °C converts the SMA resin to its sodium salt and removes the film without enzyme addition. Hard water can form calcium carboxylate bridges on the yarn, reducing desizing efficiency; sequestering agents are therefore added when water hardness exceeds 150 mg/L as CaCO₃. The process is limited by the viscosity stability of the size bath: if the bath is held above 85 °C for more than 6 h, starch retrogradation and SMA ester hydrolysis shift the size pickup and require re-standardization of the bath solids.
At 20–30 g/m² dry coat weight on 90–100 g/m² wove bond, Covinax SMA-01 is incorporated into a remoistenable envelope adhesive at 2–6 wt% of dry adhesive solids to modify open time and blocking resistance. The adhesive solution is maintained at pH 8.0–9.0; glycerin or sorbitol humectants are added at 4–8 wt% on dry film to retain rewettability. Drying is performed on a hot-air envelope machine at 60–80 °C air temperature with residence time 3–6 s. T-peel adhesion after rewetting is measured according to ASTM D1876; block resistance is assessed by stacking coated sheets under a 4.8 kg weight at 50 °C and 80% relative humidity for 24 h. The SMA resin raises the glass transition of the dry adhesive film, reducing blocking under humid storage; however, humectant levels above 8 wt% plasticize the film and overcome that benefit, causing fiber tear at separation. Published data for this specific configuration is limited; qualification should include the exact envelope paper, seam adhesive, and converting speed. The resin must be added slowly to the stirred adhesive solution to avoid local viscosity spikes, and finished adhesive pH below 7.8 should be avoided because it increases the risk of resin precipitation during storage.
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Covinax SMA-01 is an aqueous acrylic copolymer dispersion supplied by Franklin Adhesives & Polymers as a base polymer for permanent pressure-sensitive adhesive compounding. The model designation SMA-01 places the product in the Covinax family of waterborne binders; the SMA prefix is a trade code rather than a monomer abbreviation and should not be confused with styrene–maleic anhydride copolymers. As-supplied physical properties listed in the supplier’s lot-release documentation include a nonvolatile content of 50 ± 1 wt%, a pH of 4.5–5.5, and a Brookfield RVT viscosity of 400–800 mPa·s at 25 °C using spindle 3 at 20 rpm. These values are typical; the certificate of analysis controls lot-to-lot variation under the supplier’s ISO 9001:2015 release procedures. The product is used primarily in waterborne pressure-sensitive adhesives for clear film labels, decals, and general-purpose tape constructions in which a low application viscosity and transfer-coating uniformity are required.
| Property | Test method | Supplier-nominal value |
|---|---|---|
| Nonvolatile content | ASTM D4758-18 | 50 ± 1 wt% |
| pH | ISO 976:2013 | 4.5–5.5 |
| Brookfield viscosity | ASTM D2196-20, RVT spindle 3, 20 rpm, 25 °C | 400–800 mPa·s |
| Density | ASTM D1475-13 | 1.05–1.07 g/cm³ |
| Minimum film formation temperature | ISO 2115:1996 | <0 °C |
| Glass transition temperature | ASTM E1356-08(2014) by DSC | −42 °C |
| Mean particle size | ISO 22412:2017 by dynamic light scattering | 0.25–0.35 µm |
The dispersion is non-crosslinking in its neat form. Film formation occurs by particle coalescence above the minimum film formation temperature; the supplier reports an MFFT below 0 °C, so the base polymer can form a continuous adhesive film without external coalescing solvent under standard drying tunnel conditions. Glass transition temperature measured by differential scanning calorimetry is reported at −42 °C, which contributes to pressure-sensitive tack at room temperature while retaining enough cohesive strength for short-term shear resistance. The mean particle size, measured by dynamic light scattering, is in the range of 0.25–0.35 µm, and the pH is maintained with a volatile base. Because the neutralizing base is volatile, open mix tanks can undergo pH drift; this is a key processing difference from sodium hydroxide-neutralized vinyl acetate–ethylene dispersions.
In transfer coating, the adhesive is first coated onto a release liner, dried, and then laminated to facestock. In direct coating, the adhesive is coated directly onto the facestock and dried. Transfer coating is preferred for film facestocks because it prevents heat distortion of the facestock and allows tighter coat weight control. On a 1.2 m pilot coater at 120 m/min, a drying tunnel length of 6 m with three zones at 60 °C, 80 °C, and 110 °C is typically sufficient for a 20 g/m² dry coat weight when the liner is dried before coating. Direct coating on a 50 µm BOPP facestock may require a lower first-zone temperature to avoid web stretch and register drift.
The most significant difference is the polymer delivery system. Covinax SMA-01 carries high-molecular-weight acrylic copolymer in water, while solventborne acrylic PSAs carry a similar copolymer at lower solids in toluene or ethyl acetate. For a given peel adhesion, the waterborne system reduces solvent consumption in the coating tunnel and eliminates the need for solvent recovery cartridges near the oven. The trade-off is drying rate: water removal is enthalpy-limited and depends on oven dew point, whereas solvent removal from solventborne acrylics is diffusion-limited but occurs at lower thermal load. On a three-zone air-float oven with zone temperatures of 60 °C, 80 °C, and 110 °C, a 22 g/m² dry film of SMA-01 reaches residual moisture below 1.5 wt% at line speeds of 80–120 m/min. Published data for this specific configuration is limited, and the drying curve should be confirmed on the target coater.
Compared with natural rubber latex PSAs, SMA-01 offers lower initial peel but significantly less thermal yellowing and better resistance to oxidative aging. In accelerated weathering under ASTM G154-23 cycle 1 for 500 h, the acrylic base polymer shows a delta yellowness index below 2, whereas a natural rubber latex control typically exceeds 8 under the same exposure. Compared with vinyl acetate–ethylene PSAs, SMA-01 has higher clarity and better plasticizer migration resistance, but its adhesion to untreated polyolefin is lower unless a suitable tackifier is added.
Within the Covinax family, SMA-01 is selected for thin-film transfer coating rather than thick-film lamination because its low viscosity reduces the tendency for ribbing at line speeds above 100 m/min. Higher-viscosity Covinax grades may be preferred for high-coat-weight label constructions or for applications requiring higher shear resistance. The SMA-01 grade accepts hydrogenated rosin ester dispersions but may not tolerate high loadings of solvent-based tackifiers, which can cause particle coalescence and filter plugging.
The low-shear Brookfield viscosity of 400–800 mPa·s does not predict high-shear behavior at the doctor blade. Covinax SMA-01 is shear-thinning, with dynamic viscosity at 1,000 s⁻¹ approximately 40–50% of the low-shear value. On a pilot-scale reverse gravure coater with a 1.2 m web width and a 55-line/cm gravure cylinder, the high-shear viscosity at the blade is low enough to prevent paste build-up and streak defects. Film weight variation across the web is controlled within ±1.5 g/m² at a 22 g/m² target using closed-loop doctor blade pressure of 1.0–1.4 bar. The observed processing bottleneck is foam generation in the return line, not viscosity drift. Foam density in the recirculation tank remains below 50 mL/L when the return line is submerged and the pump speed is capped at 40 L/min; above that rate, microfoam carries into the gravure cells and produces pinhole defects after drying.
The surfactant system of the dispersion yields a surface tension of 38–40 mN/m in the as-supplied state. On corona-treated BOPP facestock with a dyne level of 40–42 mN/m, spontaneous wetting is adequate without additional wetting agent. On silicone release liners with surface tension below 22 mN/m, the emulsion will reticulate unless a nonionic wetting agent is added at 0.3–0.5 wt% on formulation weight. The wetting agent reduces dynamic foam height but also shifts the peel profile; a polyether-modified siloxane wetting agent may lower loop tack by 10–15% at 0.5 wt%, so the minimum effective dose should be established by drawdown and PSTC-16 loop tack measurement.
Because the base is volatile, the as-supplied pH of 4.5–5.5 will drift downward during open-top mixing if the vessel is not covered. The pH of the neat product should be checked at the start of each shift and adjusted with dilute ammonia solution of 1–2 wt% aqueous ammonia to the target range. This is different from carboxylated acrylic emulsions neutralized with fixed bases such as sodium hydroxide, which show less pH drift but lower film water resistance. The use of fixed bases to control pH with SMA-01 is not recommended because it can reduce tack and increase water sensitivity.
Condensation on a chilled silicone release liner produces cratering and transfer-coating voids when the liner surface temperature falls below the dew point. The failure mechanism is localized surface tension gradient at the wetting front, not bulk flocculation. In a winter production environment, liners stored in an unheated staging area can carry surface moisture that is invisible and causes defects at coat weights below 18 g/m². The operational boundary is a liner surface temperature at least 3 °C above the dew point, or pre-conditioning of the liner to 25 °C and relative humidity below 30% for 24 h before coating. When surface moisture is controlled, transfer efficiency exceeds 98% on a silicone-coated glassine liner at 120 m/min; when the dew-point margin is lost, transfer efficiency falls below 90% and the adhesive shows visible fisheyes.
Addition of hydrogenated rosin ester tackifier dispersions at 10 wt% on polymer solids increases 180° peel on high-density polyethylene from 1.4 N/cm to 2.1 N/cm under PSTC-101 after a 20-minute dwell. At addition levels above 20 wt%, static shear at 25 °C with a 1 kg load falls below 10 h under PSTC-107, and the dry film may develop haze in a 25 µm coating. The viscosity response is non-linear: 5 wt% tackifier addition lowers Brookfield viscosity by 80–120 mPa·s because of surfactant displacement at the particle surface, while 20 wt% addition restores the viscosity to the neat value. The final pH must be checked after tackifier addition because rosin ester dispersions typically carry a pH of 3.5–4.5; a formulation pH below 3.8 causes microflocculation, and this appears on the coating line as screen plugging and higher optical haze.
| Property | Covinax SMA-01 | Solventborne acrylic PSA | Natural rubber latex PSA |
|---|---|---|---|
| 180° peel to stainless steel, PSTC-101, 20-min dwell | 1.8–2.4 N/cm | 2.5–3.5 N/cm | 2.0–3.0 N/cm |
| Glass transition temperature by DSC | −42 °C | −45 °C to −20 °C | −60 °C to −50 °C |
| VOC potential | Water only | High, toluene/ethyl acetate | Low, ammonia water |
| UV aging, ASTM G154-23 cycle 1, 500 h | Delta yellowness index <2 | Delta yellowness index 3–6 | Delta yellowness index >8 |
For indirect food contact applications, formulators must evaluate the final adhesive against FDA 21 CFR 175.105 or 21 CFR 176.170; the base polymer is not automatically acceptable for all food types or use conditions. The dispersion contains trace residual monomers and a volatile amine neutralizer. Under EU CLP Regulation (EC) No 1272/2008, the as-supplied product is not classified as hazardous, but post-added crosslinkers or tackifiers may change the classification of the formulated adhesive. REACH registration status should be confirmed through the supplier’s safety data sheet before export.
Covinax SMA-01 should not be combined with amine-based additives other than those recommended by the supplier because a rapid pH increase above 8.0 may destabilize the dispersion and form grit. The product is not solvent-resistant; formulation with high levels of plasticizer or aromatic tackifier may reduce cohesive strength and produce adhesive transfer to the liner on aging. Pre-drying of the liner at relative humidity above 60% is required to avoid moisture-related coating defects. The product is not a zero-VOC material; residual monomer content is controlled at release but may contribute to total VOC in the final adhesive depending on the analytical method used.
