Products
Products
Products
| HS Code | 909909 |
| Product Name | Isopropyl Alcohol Recycled Grades 95/98.5% |
| Chemical Formula | C3H8O |
| Cas Number | 67-63-0 |
| Grade 95 Purity | 95% |
| Grade 98 5 Purity | 98.5% |
| Appearance | Clear colorless liquid |
| Odor | Sweet, alcoholic, isopropanol-like |
| Boiling Point | 82.5°C (180.5°F) |
| Melting Point | -88.5°C (-127.3°F) |
| Flash Point | 11.7°C (53°F) closed cup |
| Specific Gravity | 0.785-0.786 at 20°C |
| Density | 0.786 g/cm³ at 20°C |
| Solubility | Miscible in water, ethanol, ether, and chloroform |
| Refractive Index | 1.377 at 20°C |
| Vapor Pressure | 33 mmHg at 20°C |
| Autoignition Temperature | 399°C (750°F) |
| Viscosity | 2.1 cP at 20°C |
| Evaporation Rate | 1.7 (butyl acetate = 1) |
As an accredited Isopropyl Alcohol Recycled Grades 95/98.5% factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 200 L drums, Isopropyl Alcohol Recycled Grades 95/98.5% ensures safe handling, purity, and reliable industrial solvent performance. |
| Container Loading (20′ FCL) | 20′ FCL loading of recycled Isopropyl Alcohol 95/98.5%: secure drums/pails upright, ensure proper ventilation, grounding, and hazardous material labeling. |
| Shipping | Ship as UN1219, Isopropanol (Isopropyl Alcohol), Class 3, Packing Group II. Use properly grounded, sealed drums or IBCs, away from oxidizers and ignition sources. Ensure hazard labels, ventilation, and spill containment. Recycled grades require the same dangerous goods compliance as virgin product. Keep cool, dry, and clearly documented. |
| Storage | Store in tightly sealed, approved containers in a cool, dry, well-ventilated area away from heat, sparks, and open flames. Keep separated from oxidizing agents and incompatible chemicals. Use grounded equipment to prevent static discharge. Ensure secondary containment to avoid spills. Label clearly and inspect regularly for leaks or degradation. |
| Shelf Life | Shelf life is typically 2–3 years when stored sealed, cool, and away from ignition sources. |
Manufacturing lines running SAC305 lead-free solder paste at reflow peak temperatures of 245 °C to 250 °C generate flux residues that harden rapidly after cooling. Recycled IPA 98.5% is specified for automated under-stencil cleaning because its 1.5 wt% water content slows evaporation sufficiently to soften rosin and activator residues without leaving mobile ionic contamination. The solvent is dispensed through closed-loop stainless steel lines into under-stencil cleaning systems equipped with lint-free polyester or polypropylene wipes. Ultrasonic stencil cleaning tanks run at 35 °C to 40 °C for 3 min to 5 min and use 40 kHz transducers. Post-clean ionic contamination is measured per IPC-TM-650 Method 2.3.25; high-reliability lots require less than 1.56 µg NaCl/cm². Feedstock is tested against ASTM D770-21 for acidity, water, and non-volatile residue. In IPC Class 3 assemblies, the recycled 98.5% solvent must be filtered through 0.2 µm polypropylene membrane before use. The 95% recycled grade is restricted to first-pass stencil wipe-down on non-critical boards because its 5 wt% water content extends dry time and can leave water marks on fine-pitch pads. Finished PCB assemblies are processed through ionograph testing and conformal coating adhesion pull tests before release. Published data for this specific recycled feedstock configuration is limited; solder paste supplier validation is required when switching from virgin 99% IPA.
A 70/30 volume mixture of recycled 98.5% IPA and deionized water is used for cleaning precision optical glass before coating because water is a polar co-solvent for inorganic salts and reduces streaking. Undiluted 98.5% IPA evaporates too quickly to dissolve dried water-soluble residues. The blend is prepared in ISO 14644-1 Class 5 cleanrooms; deionized water resistivity must be at least 18 MΩ·cm. Knitted polyester swabs or cleanroom wipes are saturated with the blend and applied in a single direction to prevent recontamination. For laser optics, a final rinse with 98.5% recycled IPA removes residual water and prevents drying spots. The mixed solution shelf life is 24 h to reduce microbial growth. Feedstock non-volatile residue above 10 ppm disqualifies the lot for final rinse. Surface cleanliness is verified gravimetrically; residue mass must remain below 5 µg/cm². The finished optical assembly is tested at 1064 nm for laser damage threshold. Recycled 95% IPA is not used in final optical cleaning because its 5% water content leaves visible water marks on coated surfaces.
In solvent-based flexographic printing, recycled 95% IPA is used as a polarity-balanced viscosity reducer for NC/PA-based inks. Addition of 3 wt% to 8 wt% 95% grade to press-ready ink lowers dip-cup viscosity from 25 s to 18 s to 22 s at 25 °C when measured with a Zahn cup #2 according to ASTM D4212-16. The ink is reduced at the circulation tank before the doctor blade chamber; shear rate at the anilox roll typically exceeds 1,000 s⁻¹. The 5% water content helps maintain solubility of polyamide binders in laminating inks. The 98.5% grade is reserved for high-speed gravure where water content above 2% can cause dot bridging on treated polyethylene film. Finished lamination bond strength must meet at least 2.5 N/15 mm after 48 h curing at 40 °C. Batch-to-batch variation in recycled IPA water content requires in-line viscosity control with automated solvent dosing.
When recycled 98.5% IPA is introduced as a thinner for single-component acrylic conformal coatings, process control shifts from gravimetric addition to viscosity-guided addition because recycled batches may contain trace non-volatile compounds that alter the coating film. Target viscosity for selective robotic coating is 25 mPa·s to 35 mPa·s at 25 °C measured by ASTM D2196-20 Brookfield method. Addition ranges from 5 wt% to 15 wt% depending on base solids and ambient temperature. The 95% recycled grade is not recommended for humidity-sensitive coatings because 5% water delays cure and reduces adhesion to FR-4 laminate. In production, the solvent is added through a closed-loop dispensing system with 0.5 µm filtration. Flash-off time after spray at 23 °C and 50% RH is 3 min to 5 min before thermal cure at 60 °C for 20 min. Electrical testing follows IPC-CC-830B for insulation resistance and moisture resistance. Terminal coated PCB assemblies show coating thickness 25 µm to 75 µm verified by eddy current. When the water content in the recycled IPA exceeds 2%, the drying rate and polymer phase separation increase the risk of microvoiding; adhesion and moisture resistance validation are mandatory. Solder mask compatibility must be tested when lot source changes.
Table 1 lists the accepted recycled grade, water-content limit, test method, and process threshold for each downstream operation. The values represent toll blending and production-scale usage limits when recycled feedstocks are substituted for virgin solvent. Both grades require lot-specific non-volatile residue testing when used in high-precision cleaning or coating.
| Downstream Process | Accepted Grade | Water Limit | Test Method/Standard | Process Threshold |
|---|---|---|---|---|
| PCB stencil cleaning | 98.5% | ≤1.5 wt% | ASTM D770-21, IPC-TM-650 Method 2.3.25 | Ionic contamination < 1.56 µg NaCl/cm² |
| Optical cleaning | 98.5% final rinse; 70/30 blend for wash | Deionized water ≥18 MΩ·cm | ISO 14644-1 Class 5 | Residue < 5 µg/cm² |
| Flexographic ink reduction | 95% | ≈5 wt% | ASTM D4212-16 | Zahn cup #2 18 s to 22 s |
| Conformal coating thinning | 98.5% | <2 wt% | ASTM D2196-20 | Viscosity 25 mPa·s to 35 mPa·s |
| Fuel water remover | 98.5% | ≤1.5 wt% | ASTM D1364-22 | Clear at -20 °C for 24 h |
| Cleanroom disinfection | 98.5% diluted to 70% v/v | USP purified water | ASTM E2197-17 | Wet contact 10 min |
Recycled 98.5% IPA at 1.0 vol% to 2.0 vol% is blended into gasoline additive packages intended to solubilize free water in fuel. The 95% grade is not used because its 5% water content consumes water-removal capacity and can promote phase separation in low-temperature fuel. Blending is performed in stainless steel tanks with nitrogen blanketing. The IPA is added after corrosion inhibitors and before the final aliphatic solvent to avoid localized high concentration. Finished additive is filled into HDPE bottles with induction-sealed closures. Water content of the recycled feedstock is verified by ASTM D1364-22 to be ≤1.5 wt%. The fuel additive formulation must remain clear at -20 °C for 24 h. Operational boundary: do not substitute 95% material for 98.5% without reformulating the package. Published literature for recycled-grade IPA specifically in fuel water removers is limited; blend stability must be confirmed on a lot-by-lot basis.
In ISO 14644-1 Class 7 pharmaceutical support areas, recycled 98.5% IPA is diluted to 70% v/v with USP-grade purified water and used as a non-sterile surface disinfectant. The 70/30 ratio produces slower evaporation and better cell membrane penetration than undiluted 98.5%. Dilution is performed in stainless steel vessels; water is added first to reduce static charge. The solution is transferred to trigger sprayers or saturated into nonwoven wipes in a controlled environment. If a recycled lot is intended for GMP disinfection, ASTM E2197-17 evaluation of bactericidal activity against Staphylococcus aureus and Pseudomonas aeruginosa must be completed for each new feedstock. The 95% recycled grade can be diluted with less water to reach 70%, but higher non-volatile residue can remain on surfaces. Wetted wipes are packaged in low-particulate packaging. Wet contact time on surfaces is 10 min. Terminal product is a cleanroom wipe or spray used on stainless steel and epoxy surfaces.
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Recovered isopropanol sold as recycled grade IPR95-RFG contains isopropanol at 95.0% v/v minimum and water at 5.0% v/v maximum. The companion grade IPR98.5-RFG contains isopropanol at 98.5% v/v minimum and water at 1.5% v/v maximum. Both products are recovered from spent industrial solvent streams by fractional distillation; the 98.5% v/v grade receives molecular sieve dehydration before final blending. IPR95-RFG is used in general industrial degreasing, flexographic ink dilution, and wipe cleaning of non-critical metal assemblies. IPR98.5-RFG is directed to electronics pre-cleaning, precision optics wiping, and benchtop flux removal where lower water burden and faster evaporative drying are required. The products are classified as flammable liquids under GHS H225 and are not intended for pharmaceutical, cosmetic, or food-contact use absent pharmacopoeial or regulatory approval.
Conformance testing for IPR95-RFG and IPR98.5-RFG follows bulk isopropanol specification ASTM D770-11(2019) where applicable, with additional recycled-feedstock controls for trace oxygenates and non-volatile residue. The release limits in Table 1 are representative tank car/isotainer values. Batch certificates may report lower water or acetone loads depending on the waste origin and the final polishing step.
| Property | Test method | IPR95-RFG limit | IPR98.5-RFG limit | Unit |
|---|---|---|---|---|
| Isopropanol assay | GC-FID, internal normalisation | ≥ 95.0 | ≥ 98.5 | % v/v |
| Water content | ASTM E203 | ≤ 5.0 | ≤ 1.5 | % v/v |
| Acidity as acetic acid | ASTM D1613 | ≤ 0.002 | ≤ 0.002 | wt% |
| Non-volatile residue | ASTM D1353 | ≤ 10 | ≤ 10 | mg/L |
| Colour, Pt-Co | ASTM D1209 | ≤ 10 | ≤ 10 | APHA |
| Distillation range | ASTM D1078 | 80.5–82.5 | 81.5–82.8 | °C |
| Density at 20 °C | ASTM D4052 | 0.800–0.808 | 0.784–0.787 | g/cm³ |
| Flash point, closed cup | ASTM D56 | ≤ 14 | ≤ 14 | °C |
| Acetone by GC-FID | GC-FID, external standard | ≤ 0.1 | ≤ 0.05 | wt% |
Feedstock acceptance is controlled by headspace gas chromatography screening for halogenated compounds. Even 50 ppm chlorinated carryover can hydrolyse in the reboiler and cause chloride stress corrosion in 316L column internals. Waste streams with water content above 80% v/v are routed to a pre-concentration column at atmospheric pressure; the top vapour condenses near 80.4 °C, close to the isopropanol-water azeotrope. The pre-concentrate is then directed to the dehydration unit. Published data for this specific recycled configuration is limited, so the acceptance threshold should be confirmed against each plant’s metallurgy and feedstock shelf age.
Simple atmospheric rectification of dilute aqueous isopropanol cannot exceed the minimum-boiling azeotrope reported at 87.7 wt% isopropanol and 80.37 °C. The 95% v/v grade corresponds to approximately 92.5 wt% isopropanol, placing it on the anhydrous side of the azeotrope. If the incoming feed already exceeds 87.7 wt%, the 95% v/v material can be recovered as a bottom product; dilute feeds require a dehydration step. The 98.5% v/v grade is produced by pressure-swing distillation or 3A molecular sieve adsorption. Sieve beds are operated at 40–60 °C and regenerated at 220–250 °C with hot nitrogen. Online Karl Fischer monitoring alarms at 1.0% v/v water, because higher water in the product tank shifts the density and flash point outside the release limits.
In flexographic ink dilution, IPR95-RFG is blended with propyl acetate and glycol ethers at 5–15% v/v to control open time. Water above 3% v/v suppresses the solubility of nitrocellulose resins; the 95% v/v grade is therefore added only after the resin is fully dissolved in the ester fraction. High-shear dispersion equipment with Cowles blades operating at 1,500–3,000 rpm is used to prevent water-induced resin precipitation. This procedure avoids graininess in flexographic inks on polyethylene film substrates.
Dilute cleaning operations use IPR95-RFG in a 70/30 v/v isopropanol/water mixture at bath temperatures below 35 °C. Local exhaust ventilation is sized to keep the vapour concentration below 10% of the lower explosive limit, which for isopropanol is 2.0% v/v at 25 °C. The closed-cup flash point is 12 °C under ASTM D56. Wetted carbon steel is replaced with 316L stainless steel or polypropylene when the water content exceeds 3% v/v because rust staining has been observed on machined steel surfaces after 48 h immersion in recycled 95% v/v baths. Equipment grounding and bonding are mandatory during transfer because isopropanol has low conductivity and can retain static charge in high-density polyethylene lines.
In electronics pre-cleaning, IPR98.5-RFG is dispensed from stainless steel pressure cans with 0.2 µm point-of-use filters to remove particulate shedding from recycled packaging. Wipe cleaning of stencil apertures uses a saturated polyester swab; cotton swabs are avoided because cotton fibre release raises ionic contamination on printed circuit board surfaces. The solvent is allowed to evaporate until the surface temperature returns to ambient; forced air drying at 40 °C reduces cycle time but increases solvent vapour emission. The process is validated by surface insulation resistance testing under IPC-TM-650 2.6.3.7 when the board lot changes.
The relevant boundary is non-volatile residue rather than isopropanol assay. Virgin electronic-grade isopropanol commonly specifies ≤ 5 mg/L non-volatile residue, while IPR98.5-RFG releases at ≤ 10 mg/L. In post-solder removal from FR-4 assemblies, this difference can move post-clean ionic contamination from 1.2 µg NaCl/cm² to 1.6–2.0 µg NaCl/cm² when measured by IPC-TM-650 2.3.25. For Class III electronics, the recycled grade is used only for bulk pre-cleaning; final rinse is performed with 99.9% v/v virgin isopropanol or deionised water. Acrylic and polycarbonate housing materials should not be exposed to recycled isopropanol for more than 60 s because trace oxygenates may promote stress cracking in stressed mouldings.
For users replacing virgin 99.9% v/v isopropanol, the distinction from ACS/Reagent and pharmacopoeial grades is governed by trace impurity profiles, not by water content alone. ACS reagent isopropanol carries residue after evaporation and titrable acid limits that are not typically met by recycled material without a chemical oxidation step. Compared with virgin technical isopropanol, the recycled grades can contain low levels of acetone or methyl isobutyl ketone; these co-solvents modify Hansen solubility parameters and may swell nitrile, natural rubber, and acrylic elastomers after repeated contact. Direct substitution in medical device cleaning validated under ISO 10993-1 is not recommended without biocompatibility requalification. Users converting from virgin solvent should audit the recycle certificate for acetone and aldehyde content, because aldehyde traces can react with amine-cured epoxy surfaces and discolour them under heat.
Before unloading the isotainer, each shipment is accompanied by a certificate of analysis reporting GC-FID assay, water, acidity, colour, non-volatile residue, density, and flash point. The material is classified under CLP as Flam. Liq. 2 (H225), Eye Irrit. 2 (H319), and STOT SE 3 (H336). Bulk storage uses nitrogen-blanketed tanks to limit moisture ingress and to keep the vapour space below the limiting oxidant concentration for flammability. Transfer lines are grounded and bonded because isopropanol has low electrical conductivity; ungrounded plastic lines at pumping speeds above 1 m/s have generated static discharge in blending operations. These products are not sold as USP/NF, ACS reagent, or electronic-grade materials, and their recycled origin should be declared in downstream process hazard analyses.
