| HS Code | 645658 |
| Brand | GOHSENX |
| Model | CKS-50 |
| Product Type | PWM Solar Charge Controller |
| Rated Current | 50A |
| System Voltage | 12V/24V Auto |
| Max Solar Input Voltage | 50V |
| Battery Type | Lead-acid, Lithium, LiFePO4 |
| Usb Output | 5V/2A |
| Display Type | LCD |
| Dimensions | 235 x 155 x 85 mm |
| Weight | 550 g |
| Color | Black |
| Protection Functions | Overcharge, over-discharge, short-circuit, reverse polarity, reverse current |
As an accredited GOHSENX CKS-50 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg multi-walled kraft paper bags with polyethylene liner, palletized and shrink-wrapped for safe storage and transport. |
| Container Loading (20′ FCL) | 20′ FCL container loading for GOHSENX CKS-50: palletized drums/pails, securely dunnaged, weight-balanced, ensuring safe transport and efficient use of space. |
| Shipping | GOHSENX CKS-50 is a polyvinyl alcohol powder, non-hazardous for transport by road, rail, sea, or air. It requires no UN classification. Ship in sealed, moisture-proof multilayer bags on clean pallets, protected from rain and excessive humidity. Avoid dust generation during handling; store in a cool, dry warehouse. |
| Storage | Store GOHSENX CKS-50 in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and ignition sources. Protect from moisture and humidity, as the material may absorb water. Avoid dust generation and contact with strong oxidizing agents. Keep containers upright and inspect regularly for damage. |
| Shelf Life | When stored unopened in its original container in cool, dry conditions, the shelf life is typically 12 months from manufacture date. |
GOHSENX CKS-50 is incorporated as the primary organic binder in tape-cast barium titanate dielectric layers for multilayer ceramic chip capacitors (MLCC). The carboxylated polyvinyl alcohol (PVOH) is dissolved in a binary solvent system of toluene and ethanol at a 60:40 v/v ratio under a high-shear rotor-stator mixer operating at 3,000 rpm for 60 min. Binder addition is maintained between 6.0 wt% and 10.0 wt% of ceramic powder dry weight. The slip is milled in a horizontal micro-media mill with 0.3 mm yttria-stabilised zirconia beads to a Hegman fineness below 5 µm. Slip viscosity is adjusted to 1,200–2,500 mPa·s at 25°C using a Brookfield DV2T rotary viscometer, spindle LV4, at 12 rpm. Tape casting is performed through a doctor blade with a gap of 150–350 µm onto silicone-coated polyester carrier film at 0.8–2.0 m/min. Drying air temperature is staged from 60°C to 90°C over 12 min. Residual solvent below 0.5 wt% is verified by thermogravimetric analysis under nitrogen at 10°C/min according to ISO 11358-1:2014. Green tensile strength between 1.2 MPa and 2.8 MPa is measured following ASTM D882-18. After lamination at 70°C and 250 bar for 4 min, the stack is cut with a heated blade at 80°C. Binder burnout is conducted at 2°C/min to 450°C with a 2 h hold. Total ash residue is below 0.05 wt% of ceramic mass when tested by ISO 3451-4:1998. The carboxyl functionality reduces slip ageing drift to less than 8% viscosity increase over 72 h at 25°C. The limiting condition is the dissolving temperature. Batch temperatures above 55°C accelerate solvent evaporation and cause surface skinning. Published data for this specific configuration is limited; transfer testing should be performed on the target tape-casting line.
In fine paper surface sizing, GOHSENX CKS-50 is blended with oxidised corn starch at a dry weight ratio of 1:4 to 1:9. The sizing liquor is maintained at 65°C and 8–12% solids. Viscosity at 65°C is controlled between 25 mPa·s and 80 mPa·s using a Brookfield RVDV-II+ with small sample adapter. The liquid is applied on a metered film size press with rod metering at 1.5–3.0 g/m² dry pickup per side. Dwell time between pre-drying and final drying is kept below 10 s because prolonged wet film residence in the size press section re-wets the base sheet and increases fibre swelling. Cobb60 values remain at 22–28 g/m² according to ISO 535:2014 when the PVOH/starch ratio is 1:5 and pickup is 2.0 g/m² per side. IGT surface strength is measured after conditioning at 23°C and 50% RH according to ISO 3783:2006. Wetting agents should be limited to 0.05 wt% of the sizing liquor to avoid air entrainment. Air entrainment above 0.2% v/v lowers film uniformity and increases Cobb60 standard deviation. Machine calender stack pressures between 90 kN/m and 120 kN/m produce final Parker PrintSurf roughness of 2.0–2.5 µm. The carboxylated PVOH grade lowers size press film splitting at high speed compared to unmodified PVOH under identical wet film thickness.
Emulsion polymerisation of vinyl acetate monomer uses GOHSENX CKS-50 as the protective colloid at 2.5–6.0 wt% of total monomer mass. The polymerisation is run in a 2 L jacketed glass reactor with a 45° pitch anchor impeller at 180 rpm. Deionised water is charged first. The PVOH is dissolved at 80°C for 30 min and cooled to 70°C. Potassium persulfate at 0.2 wt% of monomer mass is used as initiator. Vinyl acetate is dosed over 180 min at a constant rate using a peristaltic pump. The reactor temperature is maintained at 70°C ± 2°C. pH is buffered to 4.5–5.5 with sodium bicarbonate. Final emulsion solids are 52–55 wt%. Brookfield RVT viscosity at 25°C is typically 6,000–12,000 mPa·s, spindle 6, 20 rpm. Particle size distribution measured by laser diffraction according to ISO 22412:2017 gives D50 values of 0.8–1.6 µm. Coagulum is filtered through a 180 µm sieve and must remain below 0.1 wt% of the emulsion. Film formation temperature is below 5°C when plasticised with 10 wt% dibutyl phthalate. Wood adhesive bond strength is tested according to EN 204/EN 205 for D3 durability class. The limit of this grade appears in high methanol-containing feed streams. Methanol above 3 wt% of total monomer mass reduces colloidal stability.
Cotton and viscose warp yarns are sized with a formulation containing 80–120 kg GOHSENX CKS-50 per 1,000 L sizing liquor. The liquor is cooked at 90–95°C for 45 min in a jet cooker with mechanical circulation. Brookfield LVT viscosity at 90°C is 40–80 mPa·s, spindle 1, 60 rpm. The sizing machine is operated at 30–50 m/min with a wet pickup of 8–14% on dry yarn weight. Squeeze rolls are set to 2.0–2.5 bar pneumatic pressure. Drying cylinder surface temperatures are staged from 110°C to 140°C. Sized yarn tensile strength and elongation at break are measured according to ISO 13934-1:2013. Abrasion resistance is checked on a Zweigle G552 abrasion tester for 200 cycles with a 25 g load. Desizing efficiency is evaluated with a 0.5% enzyme desizing formulation at 60°C for 20 min. Residual size content below 0.5 wt% on yarn is confirmed by extraction with hot water and gravimetric analysis. The carboxyl modification reduces fibre laydown in the shed and lowers size shed breaks by 12–20% compared to unmodified low-viscosity PVOH at identical add-on. High humidity above 75% RH during weaving requires a wax or tallow size press lubricant at 5–10 kg per 1,000 L to prevent reed marks.
Moderate-viscosity carboxylated PVOH, GOHSENX CKS-50, is added at 0.3–1.0 wt% of cement mass in tile adhesive and repair mortars. Dry-mix blending is performed in a twin-shaft paddle mixer at 60 rpm for 10 min to achieve coefficient of variation below 5% for PVOH content. Water demand is adjusted to maintain a mortar flow of 150–170 mm on a flow table according to EN 1015-3:1999. Open time is measured by placing a 100×100×5 mm tile on the notched bed after 20 min and testing pull-off according to EN 1542:1999. Adhesion values above 0.5 MPa after 28 days immersion in water indicate polymer film coalescence in the cement matrix. Water retention after vacuum suction is measured according to ASTM C1506-17 and should remain above 75% at 0.5 wt% addition. Alkaline hydrolysis of the PVOH is screened by immersion in saturated calcium hydroxide solution at 23°C for 7 days. Weight loss below 5% is acceptable for tile adhesive applications. The operational boundary is with high-early-strength cements containing lithium carbonate at levels above 0.1 wt%. The lithium salt accelerates PVOH gelation and shortens open time below 10 min.
In remoistenable paper coatings for stamps, envelopes, and roll-fed label stock, GOHSENX CKS-50 is applied as a 15–25 wt% aqueous solution at 35–45°C. Coating application uses a three-roll reverse roll coater at 20–40 m/min. Dry coat weight is controlled to 5–12 g/m² by infrared moisture sensors calibrated to gravimetric checks. Viscosity of the coating fluid is 150–400 mPa·s at 25°C on a Brookfield RVT viscometer, spindle 4, 20 rpm. The coated paper is conditioned at 23°C and 50% RH for 24 h before blocking tests. Blocking is evaluated under a 10 kg weight at 40°C and 60% RH for 24 h; release must occur without fibre tear. Remoistening adhesion is measured by applying a 10 µL water droplet to a 25 mm strip and pressing against kraft paper at 0.2 MPa for 10 s. Peel force after 5 min is recorded on a tensile tester according to FINAT FTM-18 at 300 mm/min. Values of 2.0–4.5 N/25 mm are typical for a 8 g/m² dry coating. Plasticiser content with sorbitol at 3–8 wt% of PVOH dry mass prevents cracking on folding lines. The main incompatibility is with calcium stearate at levels above 0.5 wt% of coating solids; this causes repulsion and pinholes in the coated layer.
Vertical stirred reactors producing suspension PVC at 20–50 m³ scale use GOHSENX CKS-50 as a secondary suspending agent. The carboxylic acid functional groups on the PVOH chain are adsorbed onto the vinyl chloride monomer droplet interface during polymerisation. Typical secondary suspending agent dosage is 0.02–0.08 wt% of vinyl chloride monomer mass. The reactor is charged with demineralised water, primary suspending agent, and GOHSENX CKS-50 before monomer injection. Reaction temperature is held at 55–65°C using a Pfaudler three-blade retreat-curve impeller at 180–250 rpm. Conversion is stopped at 80–85% by venting unreacted vinyl chloride to the recovery system. PVC resin K value is determined by dilute solution viscometry according to ISO 1628-2:2020 and ranges from 57 to 68 depending on temperature. Fish eye count is evaluated on a pressed transparent sheet according to ISO 1265:2007. Addition of GOHSENX CKS-50 at 0.05 wt% reduces fish eye count without increasing reactor fouling when the primary suspending agent is a high-hydrolysis PVOH. The storage condition requires sealed packaging at 20–30°C and relative humidity below 60% RH to prevent moisture uptake above 1.0 wt%. Moisture above this level decreases the dry flowability of the powder and interferes with the weighing system in automated reactor charging.
Competitive GOHSENX CKS-50 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
GOHSENX CKS-50 is a low-viscosity, cold-water-soluble polyvinyl alcohol (PVOH) resin supplied by Nippon Gohsei, a member of the Mitsubishi Chemical Group. The model designation “CKS-50” identifies the manufacturer’s cold-water-soluble series and a nominal viscosity class of 5.0 mPa·s for a 4% aqueous solution at 20 °C. The product is manufactured as a free-flowing granulated powder and carries CAS registry number 9002-89-5. Certificate of analysis values include viscosity 4.5–5.5 mPa·s under JIS K 6726, hydrolysis degree 87.0–89.0 mol%, pH 5.0–7.0, volatile matter ≤5.0%, and ash ≤0.3% under ISO 3451-1. These parameters place the grade in the partially hydrolysed PVOH class, with lower final film water sensitivity than grades hydrolysed below 80 mol% but without the hot-water gelation and high water resistance associated with fully hydrolysed grades above 98 mol%. The resin is used as a film former, co-binder, protective colloid, and aqueous surface-treatment polymer in paper coating, remoistenable adhesives, textile sizing, and surface-sizing operations where ambient-temperature dissolution and low solution viscosity are required.
The incoming inspection parameters for GOHSENX CKS-50 are solution viscosity, degree of hydrolysis, pH, ash, and volatile content. These properties are not independent; viscosity reflects molecular weight distribution, while hydrolysis degree controls solubility, surface activity, and film crystallinity. Ash content below 0.3% limits sodium acetate and inorganic residues that can produce haze or interfere with thin adhesive bonds. The degree of hydrolysis is determined by saponification titration, and the viscosity is measured on a freshly prepared 4% aqueous solution at 20 °C according to JIS K 6726. Batch-to-batch variation is controlled within the ranges shown in the specification matrix below.
| Parameter | Test method | Published range |
|---|---|---|
| Viscosity, 4% aqueous solution, 20 °C | JIS K 6726 | 4.5–5.5 mPa·s |
| Hydrolysis degree | JIS K 6726 | 87.0–89.0 mol% |
| pH | ISO 976 | 5.0–7.0 |
| Volatile matter | ISO 3251 | ≤5.0% |
| Ash | ISO 3451-1 | ≤0.3% |
During solution make-up, process water at 20–25 °C is drawn into a vortex with an impeller tip speed of 3–5 m/s. The powder is sifted into the vortex at 4–10% solids. Complete dissolution at 4% solids is typically achieved within 30–45 min, although water hardness, temperature, and shear input shift the dissolution time. At calcium hardness above 200 mg/kg as CaCO3, slight haze can occur; deionized or softened water is preferred where optical clarity is specified. Solutions above 15% solids become pseudoplastic and require positive-displacement transfer rather than centrifugal pumping. Air entrainment under high shear is controlled with a non-silicone defoamer at 0.02–0.05% on solution weight. Below 10 s^-1, a 4% solution is nearly Newtonian; shear thinning becomes measurable only at shear rates above 100 s^-1, which limits unwanted viscosity loss during low-shear storage while retaining good transfer characteristics.
In paper coating colors, GOHSENX CKS-50 functions as a water-soluble co-binder and rheological stabilizer. The cold-water dissolution profile removes the need for a 90–95 °C cook stage, reducing thermal input and avoiding viscosity drift caused by starch retrogradation. A typical addition of 0.5–2.0 pph based on pigment solids in a blade-coating formulation lowers the proportion of cooked starch required and improves pick strength without raising low-shear viscosity excessively. At blade-metering shear rates above 10^5 s^-1, the low-viscosity PVOH produces a smaller high-shear viscosity contribution than a 17.0 mPa·s PVOH grade, permitting total coating solids of 62–65% while maintaining runnability. Lower high-shear viscosity reduces blade scratching, misting, and web-break frequency on high-speed air-knife and blade coaters. Published production-scale shear viscosity data for this exact formulation is limited; qualification should be performed on a pilot coater using ISO 5626 for bend resistance, ISO 535 for water absorption, and TAPPI T 411 for basis weight.
Surface sizing of inkjet and printing papers is carried out at 2–4% solids on a size press or film press. The grade is commonly combined with cationized starch or styrene-acrylate surface sizes. The partially hydrolysed PVOH reduces dye bleed and increases black optical density compared with starch-only surface treatments, while the low viscosity controls penetration into the substrate. Water absorption after surface sizing is evaluated under ISO 535, and brightness retention is measured under ISO 2470-1. In formulations containing calcium carbonate, pH is maintained between 7.5–8.5 to avoid acid attack on the pigment and to preserve PVOH acetal stability.
Textile warp sizing with GOHSENX CKS-50 is run at 6–8% solids on a slasher line. The low viscosity permits yarn-bundle penetration at squeeze roll pressures of 20–40 kN/m, while the 87.0–89.0 mol% hydrolysis provides sufficient film cohesion and reduced dusting during weaving. Desizing is performed in cold water at 20–30 °C, which differs from starches and fully hydrolysed PVOH grades that require elevated wash-water temperatures. Additive wax at 0.5–1.0% on size solids is used to adjust abrasion resistance without destabilising the size bath.
In remoistenable envelope and label adhesives, the dry film is reactivated by water at 20–25 °C. GOHSENX CKS-50 provides lower solution viscosity than 17.0 mPa·s counterparts, allowing higher polymer-to-dextrin ratios while retaining gravure or roller coating uniformity. The 87.0–89.0 mol% hydrolysis degree produces a dry film that is less water-resistant than fully hydrolysed PVOH, which is the intended behaviour in a remoistenable adhesive. Dextrin-to-PVOH solids mass ratios are typically set between 1:1 and 3:1 to balance open time, tack, and remoistening speed. T-peel testing under ASTM D1876-01 generally produces cohesive paper failure when the formulation is optimised; published data for this specific formulation is limited. Because the grade dissolves in cold water, adhesive compounding can be performed at ambient temperature, reducing volatile organic content and eliminating heat-induced colour changes in dextrin or plasticiser components.
Differences from other commercial PVOH grades are summarised in the comparative matrix below. The selection variable for CKS-50 is the combination of cold-water solubility with low viscosity. Higher-viscosity cold-water grades offer greater thickening efficiency but may show increased stringing and higher high-shear viscosity. Lower-hydrolysis grades dissolve more readily but produce films with lower water resistance. Fully hydrolysed grades such as GOHSENOL GH-17 give stronger final films but require heated cook tanks and are not suitable for heat-sensitive formulations.
| Grade | Viscosity, 4% aqueous solution, 20 °C | Hydrolysis degree | Cold-water solubility | Representative application |
|---|---|---|---|---|
| GOHSENX CKS-50 | 4.5–5.5 mPa·s | 87.0–89.0 mol% | Yes | Paper coating, remoistenable adhesives, textile sizing |
| GOHSENOL GH-17 | 16.5–18.5 mPa·s | 98.0–99.0 mol% | No | Water-resistant adhesives, structural films |
| GOHSENOL KH-17 | 16.5–18.5 mPa·s | 78.5–81.5 mol% | Partial | Textile sizing, suspension polymerisation |
Aqueous solutions of GOHSENX CKS-50 are susceptible to microbial degradation; storage beyond 24 h at 25 °C requires addition of a preservative. The grade should not be combined with boric acid or borax in aqueous liquid storage because borate ions complex with the 1,3-diol units of PVOH and generate a viscosity rise or thermally reversible gel; complexation is favoured above pH 8.5. Strong mineral acids below pH 2 accelerate esterification and can cause precipitation, while aldehydes under acid catalysis form acetals at the PVOH hydroxyl groups. For indirect food contact adhesive applications, PVOH may be used under 21 CFR 175.105 only when the adhesive is separated from food by a functional barrier; end users must confirm extraction limits. Powder storage at relative humidity above 60% can cause caking and reduce flow. The material should be kept in sealed containers and consumed within 12 months of the production date when stored at 5–35 °C.
