| HS Code | 751097 |
| Brand | GOHSENX |
| Model | LW-200 |
| Product Type | 3D self-leveling cross-line laser level |
| Laser Wavelength | 520 nm green beam |
| Laser Class | Class 2 (<1 mW) |
| Accuracy | ±3 mm/10 m |
| Self Leveling Range | ±4° |
| Horizontal Line Coverage | 360° |
| Vertical Line Coverage | 360° |
| Battery Capacity | 4000 mAh rechargeable lithium battery |
| Battery Life | Up to 12 hours |
| Charging Port | USB-C |
| Protection Rating | IP54 |
| Mounting Thread | 1/4-inch tripod mount |
As an accredited GOHSENX LW-200 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENX LW-200 is supplied in 20 kg multi-layer paper bags, ensuring safe handling, dry storage, and product protection. |
| Container Loading (20′ FCL) | GOHSENX LW-200 is loaded as a 20′ FCL, in sealed bags on pallets, stowed securely for safe transport. |
| Shipping | GOHSENX LW-200 is shipped as a solid resin in sealed multi-layer bags or drums, protected from moisture. It should be transported in clean, dry containers and stored away from extreme heat, humidity, and direct sunlight. Standard non-hazardous handling applies; keep packaging intact to prevent contamination during transit. |
| Storage | Store GOHSENX LW-200 in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep the container tightly sealed to prevent moisture absorption, as the material is water-sensitive. Avoid contact with oxidizing agents and store away from foodstuffs. Use proper labeling and maintain reasonable temperature stability to preserve product quality. |
| Shelf Life | For GOHSENX LW-200, shelf life is typically 24 months from production when stored sealed in cool, dry conditions. |
In a 4,800 mm blade coater running a calcium carbonate/clay precoat at 1,000–1,200 m/min, GOHSENX LW-200 is supplied to the coating color only after the pigment slurry has undergone high-shear mixing with polyacrylate dispersant at 55–60 wt% solids; the PVOH stock solution is prepared separately at 15–20 wt% solids in a jet cooker held at 90–95 °C for 30 min, cooled to 25–30 °C, and then metered into the mixing tank to achieve 0.5–2.0 parts dry binder per 100 parts dry pigment. The stock must not be combined with borate-containing insolubilizers in the same tank because premature crosslinking raises the low-shear viscosity beyond the coating color handling limit before the blade application zone; any crosslinker is dosed in-line downstream after the final screen. The function of GOHSENX LW-200 at this addition window is not to increase low-shear coating color viscosity but to raise the water retention value measured by pressure filtration at 0.5 MPa for 90 s, which prevents aqueous phase migration into the base stock during blade dwell times between 15 ms and 80 ms at speeds above 800 m/min. On a four-zone air-float dryer with zone temperatures of 80 °C, 110 °C, 150 °C, and 110 °C, the bound PVOH restricts binder migration and allows the coated sheet to reach the dry pick resistance required for offset and gravure printing. Relevant compliance paths are FDA 21 CFR 176.170 and 21 CFR 176.180 for paper and paperboard intended for aqueous and fatty food contact, with extraction testing conducted under final use conditions; compositional consistency is verified against JIS K6726:1994 for polyvinyl alcohol, ISO 1762:2019 for ash content, and ISO 2470-1:2016 for finished brightness. Terminal products in this application include single-layer and double-layer coated fine paper, art board, thermal paper base stock, and folding carton board where the PVOH-containing coating does not exceed the indirect food-contact migration limits. Published data for this specific grade in single-layer thermal base precoat is limited; the addition range is adjusted by pilot coater drawdown prior to production.
Dissolution of GOHSENX LW-200 in demineralized water at 20–25 °C to a stock concentration of 8–12 wt% precedes the charge into a 6,000 L stainless steel reactor with a pitched-blade turbine running at tip speeds of 2.5–4.0 m/s; vinyl acetate monomer is fed semi-continuously over 4–6 h while the jacket holds the reaction mass at 68–75 °C. Protective colloid addition is 0.5–5.0 wt% based on total vinyl acetate monomer, with the lower half of that range producing coarse, high-viscosity polyvinyl acetate homopolymer dispersions above 20,000 mPa·s at 55% solids, and the upper half reducing coagulum formation to below 0.1% of wet latex on a 180 µm screen while shifting the particle size distribution toward smaller volume mean diameter. The process conflict in this grade band is the inverse relationship between particle size and low-shear viscosity: increasing colloid concentration for low coagulum can produce a latex that exceeds the 2,000–5,000 mPa·s Brookfield viscosity limit of downstream paper laminating lines, and the viscosity rise becomes most visible when the emulsion is cooled to 25 °C after the 30 min hold at 75 °C. Therefore the colloid concentration is not selected by data sheet alone but by a stirred batch matrix measuring ASTM D2196-20 viscosity at 12 rpm, ASTM D1210-05 fineness of grind, and volumetric particle size by laser diffraction after dilution with deionized water containing 0.1% sodium lauryl sulfate. Compliance for the finished emulsion used as a paper or packaging adhesive is anchored to FDA 21 CFR 175.105 for indirect food contact, EU 10/2011 for plastic food-contact materials, and REACH Regulation EC 1907/2006 for registration and restriction of substances. Terminal products include PVAc homopolymer dispersion, vinyl acetate-ethylene copolymer latex, and quick-setting adhesive for paper tubes, corrugated lamination, and wood assembly where the adhesive film is separated from food by a functional barrier.
Remoistenable envelope adhesives based on GOHSENX LW-200 are compounded by dissolving 15–25 wt% solids in demineralized water at 80–90 °C under an anchor stirrer at 20–30 rpm; the cooled solution at 30–35 °C is transferred through an 80 µm mesh filter before coating at 0.02–0.08 g/m² dry adhesive on paper. Addition ratio falls between 1 wt% and 5 wt% of the wet adhesive formulation solids, with plasticizer and dextrin fractions adjusted to maintain an open time of 5–15 s on automated envelope lines running at 600–1,000 pieces/min. The primary process limitation is foaming in the coating pan, controlled by pre-dissolution and vacuum deaeration at 80 mbar absolute. Compliance under FDA 21 CFR 175.105 and REACH Regulation EC 1907/2006 is required where the remoistenable film is used on food-contact packaging; ASTM D1084-16 is used for viscosity comparison. Published data for this exact GOHSENX LW-200 grade in remoistenable envelope adhesives is limited; pilot coating trials are used to establish the rheology window. Terminal products include envelope flap adhesive, remoistenable label adhesive, and wallpaper pre-paste where water activation and blocking resistance are controlled on the same line.
In porous inkjet receiver layers, GOHSENX LW-200 at 1–5 dry parts per 100 parts fumed silica or alumina stabilizes the high-shear dispersion and reduces micro-cracking in the dried coating without sealing the surface to ink absorption. The aqueous coating is compounded in a high-shear disperser at 15–20 wt% solids, then treated with a vacuum deaerator at 40–80 mbar before being applied by roll blade or rod coater at 30–60 m/min; drying in three zones at 60 °C, 90 °C, and 110 °C leaves a porous layer of 10–20 µm dry film thickness. At relative humidity above 60%, pre-drying of the coated substrate before calendering is required because residual PVOH plasticization increases calender picking and can reduce coated surface uniformity. The addition ratio determines the balance between tensile strength of the coating layer and liquid absorption capacity; increasing PVOH concentration beyond 5% of dry pigment raises gloss but depresses short-time cyan density and can cause banding at the metering rod. Compliance testing for commercial inkjet paper uses ISO 2470-1:2016 for brightness, ISO 8791-4 for Parker PrintSurf roughness, ISO 11475:2017 for whiteness, and FDA 21 CFR 176.170 where the printed sheet is intended for indirect food contact. Terminal products are matte and glossy photo inkjet papers, wide-format CAD and GIS plotting media, and specialty proofing sheets.
In tape casting of barium titanate and low-temperature co-fired ceramic dielectrics, GOHSENX LW-200 is used as a sacrificial binder at 3–7 wt% of the inorganic powder, with polyvinyl alcohol plasticized by 5–15 phr of a low-molecular-weight polyol to prevent green sheet brittleness after drying at 60–80 °C. The slurry is milled for 18–24 h in a solvent or aqueous system containing 0.2–0.5 wt% of an anionic dispersant; after milling, the slurry is de-aired at 50 mbar and cast through a doctor blade gap of 0.50–2.00 mm onto a PET carrier moving at 0.5–2.0 m/min. The dried green tape is punched or screen printed before a two-stage burnout that ramps at 1 °C/min to 600 °C, holding for 60 min, to remove the PVOH without leaving conductive carbon residue. Residual ash after burnout is typically specified below 0.05 wt% because alkali or transition metal residue shifts dielectric loss in high-frequency LTCC circuits. Standards include ASTM C1161-18 for flexural strength of advanced ceramics, ASTM E1131-20 for compositional analysis by thermogravimetry, and REACH Regulation EC 1907/2006 for boundary substances in lead-free dielectrics. Terminal products are multilayer ceramic capacitors, LTCC substrates, and ceramic membranes where green sheet tensile strength and defoaming are critical.
A 30 m³ non-baffled stainless steel autoclave operating at 52 °C receives GOHSENX LW-200 as the secondary suspension agent at 0.02–0.08 wt% of the demineralized water charge, after the primary high-hydrolysis PVOH has been dispersed and heated to reaction temperature; the secondary PVOH modifies droplet coalescence and final resin porosity without reducing bulk density below 0.52 g/cm³. The polymerization is run at 200–300 rpm with a three-blade retreat-curve impeller, using di-2-ethylhexyl peroxydicarbonate at 0.10–0.20 pph of vinyl chloride monomer, with the conversion terminated at 65–75% by pressure drop before the autoclave is degassed and the slurry is dewatered through a 150 µm rotary vacuum drum. The resin particle size distribution and plasticizer absorption are determined according to ASTM D1755-15 for PVC resin classification, and finished articles require FDA 21 CFR 177.1210 or EU 10/2011 depending on end-market. Published data for this specific GOHSENX LW-200 grade in suspension PVC is limited; the addition range is typically established through reactor trial series because suspension behavior changes with primary colloid ratio and stirrer power number. Terminal products include rigid PVC pipe resin, siding resin, and medical-grade PVC compound where high bulk density and consistent porosity are mandatory.
| Application zone | Standard / regulation | Test method or clause | Boundary condition |
|---|---|---|---|
| Paper and board pigment coating | FDA 21 CFR 176.170 | Extraction for aqueous and fatty food contact | Indirect food contact; migration below specified limits |
| Polyvinyl acetate emulsion | FDA 21 CFR 175.105 | Indirect food-contact adhesive component | Functional barrier or separation required |
| Remoistenable envelope adhesive | EU 10/2011, REACH EC 1907/2006 | Overall migration and specific migration limit testing | Dry film contact only; no direct fatty food contact |
| Inkjet receiver coating | ISO 2470-1:2016, ISO 8791-4 | Brightness and Parker PrintSurf roughness | Press printability targets; no heavy metals |
| Ceramic green tape | ASTM C1161-18, ASTM E1131-20 | Flexural strength and thermogravimetric burnout | Ash residue after burnout below specification |
| Suspension PVC | ASTM D1755-15 | Resin classification and plasticizer absorption | Bulk density and K-value within customer pipeline |
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Solution viscosity is measured on a 4 % solids aqueous solution at 20 °C using a Brookfield LV rotational viscometer with spindle No. 1 at 60 r/min. The applicable method designations are ISO 2555:2018 and ASTM D2196-20. Degree of hydrolysis should be determined by the saponification value method in JIS K6726:2006. Non-volatile content is reported according to ISO 3251:2019 using a forced-air oven at 105 °C for 6 h. Ash is measured according to ISO 3451-1:2019 at 600 °C in a muffle furnace. The pH of a 4 % aqueous solution should also be recorded. Each lot should be checked against the supplier certificate rather than against a single global value, because published values for GOHSENX LW-200 vary in secondary trade literature and are not independently reproducible.
Production-scale dissolution requires controlled wetting before heat-up. In a 1,000 L jacketed kettle with a marine impeller, the powder is wetted into ambient water below 27 °C, then heated to 85–95 °C and held for 30–60 min under low shear. A side-entry powder inductor or eductor is preferred over dumping through the manway. If the powder is not adequately wetted, gel agglomerates form as clear lumps that are not removed by a 100 µm filter. The low-viscosity nature of GOHSENX LW-200 should reduce hydration time relative to a high-viscosity grade, but the exact reduction must be confirmed on the line because published data for this product is limited. The operator should record steam jacket pressure, agitator current, solution clarity at 250 µm filtration, and final viscosity before use. Dissolution temperature control should be maintained within ±5 °C of the setpoint because the hydration rate changes sharply near the crystalline melting region of PVOH. In continuous dissolution lines with a rotor-stator mixer, feed rate is limited by wetting efficiency; an addition rate above 0.25 kg/min in an unbaffled 1,000 L tank can create persistent microgel.
In vinyl acetate and vinyl acetate-ethylene emulsion polymerization, low-viscosity PVOH functions as a protective colloid. A reactor charge typically uses 2–5 parts per hundred monomer dry basis. In a 10 m³ jacketed reactor with a pitched-blade turbine, the lower solution viscosity of GOHSENX LW-200 can reduce agitator power draw at equivalent solids compared with a medium-viscosity grade. This is not a linear substitution. Above a process-specific protective colloid concentration, further addition may shift the particle size distribution from bimodal to monomodal and raise final emulsion viscosity by a factor of 1.8–2.3. Published data for this specific configuration is limited; therefore, the substitution trial should record agitator current, reactor wall film formation, finished emulsion filterability at 180 µm, and stability after 30 days at 40 °C. In rotor-stator homogenizers, the addition sequence is process-critical: injection before the homogenizer yields lower droplet coalescence than post-homogenizer addition in PVOH-stabilized emulsions.
Kinetic parameters for vinyl acetate polymerization are not specific to GOHSENX LW-200. Peer-reviewed data for vinyl acetate report propagation rate coefficients on the order of 10³ L mol−1 s−1 between 60 °C and 80 °C; the protective colloid can influence aqueous-phase oligomer nucleation and radical transfer. The process conflict appears when the lower viscosity of LW-200 is compensated by raising solids: the protective colloid concentration then approaches a range where emulsion viscosity increases nonlinearly and the jacket heat transfer coefficient declines. The operator should control the pre-emulsion addition at the lowest concentration that yields stable dispersion, and should not extrapolate from medium-viscosity grade data without a pilot-scale batch. A 50 L pilot reactor with an anchor impeller is sufficient to compare lot-to-lot variance and identify the viscosity break point.
In paper surface sizing, GOHSENX LW-200 is introduced into starch or styrene-acrylate size press formulations at solids between 6 % and 12 %. On a flooded-nip size press, the lower solution viscosity increases penetration into the sheet and can reduce size-mist aerosol formation at constant machine speed. The relevant measurement is apparent viscosity at 60 °C by a rotational viscometer; if viscosity falls below the control range, the operator may raise the PVOH fraction by 0.5–1.0 percentage points and record coat weight change on a blade coater. Production-scale experience shows that replacing a medium-viscosity PVOH with a low-viscosity grade without solids adjustment can lower wet-film thickness by a measurable amount, but the exact shift for GOHSENX LW-200 is not publicly documented. A trial should record base paper porosity, size mix temperature, roll nip pressure, and coat weight for at least 8 h of steady-state operation.
In adhesive compounding, the low-viscosity character of GOHSENX LW-200 is used where wet tack and open time must be controlled without raising final adhesive viscosity. It can be blended with starch, dextrin, or carboxylated styrene-butadiene latex. A laboratory drawdown on stainless steel with a 100 µm wire rod should be followed by lap shear or peel testing according to ASTM D1002-10 or ASTM D903-98. Published data for this specific adhesive configuration is limited; the formulator should vary the PVOH fraction between 2 % and 6 % of dry solids and measure open time and set time under 23 °C and 50 % RH. Adhesive viscosity should be checked after 24 h and 72 h to detect delayed thickening or phase separation.
On a high-speed paper machine running above 1,200 m/min, the size press is sensitive to viscosity mismatch between the base formulation and the substituting PVOH. A low-viscosity grade such as GOHSENX LW-200 can produce a thinner size film at the same metering rod pressure, which may reduce size pick-up unless the solids are adjusted. In a rod-metered size press, the film split in the nip is governed by the rheology of the size solution at high shear. The apparent viscosity at 60 °C should be checked over a shear rate range from 10 s−1 to 1,000 s−1 using a cone-and-plate viscometer. If the viscosity at 1,000 s−1 is below the line-specific control limit, the operator should increase the PVOH fraction in increments of 0.25 % and monitor blade scratches, backing roll contamination, and afterdryer deposits. No general numeric cut-off can be quoted for GOHSENX LW-200 because published data for this specific configuration is limited. A production-scale trial should include at least 24 h of continuous operation to capture drying section fouling and viscosity drift.
In textile warp sizing, GOHSENX LW-200 is evaluated as a film former in low-viscosity size mixes for polyester-cotton yarns. A slasher with double squeeze rolls typically operates at size-box temperatures of 60–80 °C. The low-viscosity grade can reduce size add-on variation at high machine speeds, but the effect depends on yarn hairiness and squeeze pressure. Published data for this specific grade in warp sizing is limited; a mill trial should record size-box viscosity, squeeze pressure, size add-on, and weaving room humidity at 65 % RH. The lower molecular weight may reduce yarn-to-yarn adhesion relative to a medium-viscosity PVOH, so a production lot trial should be run before replacing the incumbent grade.
In ceramics and pigmented systems, PVOH is used as a temporary binder and rheology modifier. GOHSENX LW-200 may be suitable where low-viscosity binder solutions are needed for spray-dried granules. A slip made with 0.5–2.0 % PVOH by dry weight can be spray-dried at inlet temperatures of 180–220 °C and outlet temperatures of 80–110 °C. However, published data for GOHSENX LW-200 in ceramic spray drying is limited; the user should measure green density, granule size distribution, and burnout residue after firing at the specified kiln cycle.
Differentiation between GOHSENX LW-200 and other PVOH products is based on molecular weight and degree of hydrolysis. Low-viscosity grades have a lower average degree of polymerization and lower solution viscosity at equivalent concentration than medium-viscosity or high-viscosity grades. This leads to faster dissolution at lower temperatures, lower drag in pumping and filtration, and lower film tensile strength. A partially hydrolyzed low-viscosity grade is generally selected for emulsion polymerization and remoistenable adhesives; a fully hydrolyzed medium-viscosity grade is selected for solvent-resistant film and barrier sizing. The degree of hydrolysis of GOHSENX LW-200 must be verified from the supplier certificate. Film tensile properties should be compared by casting a 100 µm wet film and conditioning at 23 °C and 50 % RH for 48 h before testing to ASTM D882-18. The lower molecular weight may also increase migration in multilayer structures, but published data for GOHSENX LW-200 in such structures is limited.
Operational boundaries for storage include keeping the powder in closed containers at ≤ 30 °C and ≤ 60 % RH. High humidity increases caking and can affect gravimetric feeder accuracy. Aqueous solutions are subject to microbial growth; biocide selection should be based on jar testing under the intended storage temperature and pH. Borate ions and some polyvalent metal salts cause reversible crosslinking or thickening and should be avoided unless the process is specifically designed for gelation. Blending GOHSENX LW-200 with anionic formulations may require pH buffering; prolonged hot storage below pH 4 or above pH 10 can shift ester hydrolysis and change solution viscosity. These boundaries should be confirmed by a 72 h storage stability test at the process temperature. Because published data for this specific configuration is limited, purchase specifications should require the supplier to disclose the analytical method lot and not merely a typical value.
| Parameter | Method designation | Test condition |
|---|---|---|
| Solution viscosity | ISO 2555:2018 / ASTM D2196-20 | 4 % solids, 20 °C, Brookfield LV, No. 1 spindle at 60 r/min |
| Degree of hydrolysis | JIS K6726:2006 | Saponification value method |
| Non-volatile content | ISO 3251:2019 | 105 °C, 6 h, forced air |
| Ash content | ISO 3451-1:2019 | 600 °C, muffle furnace |
| Film tensile | ASTM D882-18 | 23 °C, 50 % RH, conditioned 48 h |
