Jotamastic 85 Low Surface Preparation General Purpose Epoxy belongs to Epoxy. Industrial protective coatings segment: recommended for vessels, offshore facilities, refineries, power plants, pipelines, bridges, buildings, mining equipment and other conventional steel structures. A multi-purpose, highly application-tolerant and efficient surface-tolerant primer that can be used at various temperatures on various application areas and accepts overcoating within a short time. Parameters on this page: volume solids 72 ± 2%, dry film thickness 100–250 µm, theoretical spreading rate 7.2–2.9 m²/L.
Parameter source: JOTUN original technical data sheet (TDS) "Jotamastic 85 Low Surface Preparation General Purpose Epoxy"; values such as spreading rate are converted from TDS parameters and are for model selection reference only.
The above content is compiled from the manufacturer's datasheet and this site's parameter tables. For selection, coating systems and lead times, pleaseContact Usfor confirmation.
This page carries the full TDS for this product, translated from the manufacturer's original document. No file download is needed; for an original-language copy, send an enquiry.
| Volume Solids | 72 ± 2% |
|---|---|
| Dry Film Thickness | 100–250 µm |
| Theoretical Spreading Rate | 7.2–2.9 m²/L |
| VOC | 216 g/L (China) |
| Density / Specific Gravity | 1.4 kg/L |
| Number of Components | Two-component |
| Flash Point | 31 °C |
| Thinner | Jotun Thinner No. 17 |
| Mixing Ratio | 4 parts : 1 part (by volume) |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
Jotamastic 85
A multi-purpose, highly application-tolerant and efficient surface-tolerant primer that can be used at various temperatures on various application areas and accepts overcoating within a short time. An epoxy mastic high-build coating developed on the basis of more than 35 years of anticorrosive protection experience. A high-solids product. May be used as a primer in atmospheric and immersion environments. Suitable for suitably prepared carbon steel, galvanized steel, stainless steel, aluminium, concrete and many aged coated surfaces. May be applied to substrate surfaces below zero degrees Celsius.
General:
Mainly for maintenance and repair.
Marine coatings:
Exterior and interior areas, including the hull shell, superstructure and decks.
Industrial protective coatings:
Recommended for vessels, offshore facilities, refineries, power plants, pipelines, bridges, buildings, mining equipment and other conventional steel structures.
Others
Certified in accordance with IMO Res.215(82), suitable for ballast water tanks, PSPC standard. Grain certificate issued by the occupational health authority of Newcastle (UK). Approved in accordance with ANSI/AWWA C210/15 "Liquid Epoxy Coating and Lining for Steel Water Pipes and Fittings" for areas where the coating is not in direct contact with potable water.
Certified compliant with the low flame-spread requirements of the IMO 2010 FTP Code. Other certificates and approvals are available on request.
Aluminium, Aluminium Red, Grey, Red, White, Black
| Property | Test / Standard | Description |
| Volume Solids | ISO 3233 | 72± 2 % |
| Gloss (GU 60°) | ISO 2813 | Matt (0–35) |
| Flash Point | ISO 3679 Method 1 | 31 °C |
| Density | Theoretical Value | 1.4 kg/L |
| Region | Regulations | Test / Standard | VOC Value |
| US | CARB(SCM)2020 / SCAQMD rule 1113 | US EPA Method 24 | 247 g/L |
| Hong Kong | Air Pollution Control (VOC) Regulation | 247 g/L | |
| EU | European Paint Directive 2004/42/CE | Calculation | 260 g/L |
| China | Mandatory national standard of China | GB 30981.2-2025 | 216 g/L |
Coating hazards GB 30981.2-S-Pb≤1000-NC. The data listed are based on factory batch production and may vary slightly with colour.
| Gloss description | According to JOTUN's definition of functional coatings |
|---|
Typical recommended specification range
| Dry Film Thickness | 100–250 µm |
| Wet Film Thickness | 140–345 µm |
| Theoretical Spreading Rate | 7.2–2.9 m²/L |
Surface Preparation
| Substrate | Minimum | Recommended |
| Carbon Steel | St 2 (ISO 8501-1) | Sa 2 (ISO 8501-1) |
| Stainless steel | The surface should be blasted with a non-metallic abrasive, | “Blast clean using an approved non-metallic abrasive |
| hand- or machine-sanded using abrasive paper or fibre discs, | to produce a sharp angular surface profile.” |
to produce scratch marks on the surface.
| Aluminium | The surface should be blasted with a non-metallic abrasive, | “Blast clean using an approved non-metallic abrasive |
| hand- or machine-sanded using abrasive paper or fibre discs, | to produce a sharp angular surface profile.” |
| Galvanised steel | The surface should be clean, dry and have a suitable profile | Sweep blast with a non-metallic abrasive to produce a clean, |
| ° | a rough and uniform surface. | |
| Shop-primed Steel | Clean, dry and intact shop primer (compliant with ISO 12944-4 clause 5.4). | Sa 2 (ISO 8501-1) |
| Coated surface | A clean, dry and sound compatible primer. | |
| Concrete | On rough, clean, dry, laitance-free surfaces, sweep blast at low | At least 4 weeks of curing time. Maximum moisture content 5%. Use |
| Water jetting. | closed-cycle shot blasting, diamond grinding and other suitable methods to treat the surrounding concrete surface and remove laitance. | |
This product may be applied by the following methods
| Spray: | Apply by airless spray. |
| Brush: | Recommended for touch-up and small-area application. Take care to achieve the specified dry film thickness. |
| Roller: | May be used for small areas, but not recommended as the first primer coat. However, with roller application, take care to apply sufficient material to achieve the specified dry film thickness. |
| Jotamastic 85 Comp A Surface-tolerant Universal Epoxy, Component A | 4 parts |
| Jotamastic 85 Comp B Surface-tolerant Universal Epoxy, Component B | 1 part |
| Thinner | Jotun Thinner No. 17 |
|---|
| Nozzle tip size (inch/1000): | 19-25 |
| Nozzle pressure (minimum): | 150 bar/2100 psi |
| Substrate Temperature | -5 °C | 0 °C | 5 °C | 10 °C | 23 °C | 40 °C |
| Touch Dry | 20 h | 14 h | 6 h | 5 h | 3 h | 1 h |
| Walk-on Dry | 48 h | 30 h | 16 h | 10 h | 5 h | 2 h |
| Minimum recoat interval | 36 h | 24 h | 12 h | 8 h | 4 h | 2 h |
| Dry/cured to service | 28 d | 21 days | 14 days | 10 days | 7 days | 3 days |
For the maximum recoat interval, refer to the Application Guide (AG) for this product.
Drying and curing times are determined based on temperature and relative humidity below 85%, with dry film thickness within the average range.
| Touch Dry | The state at which light finger pressure leaves no mark or stickiness. |
|---|---|
| Walk-on Dry | The minimum time after which the coating allows normal foot traffic without leaving permanent footprints, marks or other physical damage. |
Minimum recoat interval after drying: the recommended minimum interval before applying the next coat.
Dry/cured to service: the minimum time before the coating can be permanently exposed to a specific environment/medium.
| Paint temperature | 23 °C |
| Induction Time | 10 min |
| Pot Life | 1.5 h |
Temperature
| Drying, atmospheric | Continuous 120 °C | Peak 120 °C |
| Immersed, sea water | 50 °C | 60 °C |
Withstands peak temperatures for a maximum of one hour.
At the above temperatures, protective performance is unaffected, but appearance may be affected.
Note: this coating can withstand different immersion temperatures, depending on the specific chemical and whether immersion is continuous or intermittent. Heat resistance is affected by the coating system as a whole. When used with other coatings, ensure that all coatings in the system have similar heat resistance.
Depending on the actual exposure conditions in service, this product may be used with various primers and topcoats. Some reference systems are listed below. For specific systems, contact JOTUN.
| Previous coat: | Inorganic zinc shop primer, Epoxy, Modified epoxy, Inorganic zinc silicate |
| Subsequent coat: | Modified epoxy, Epoxy, Polyurethane, Acrylic, Alkyd |
| Volume | Container Size | |
| (L) | ||
| Jotamastic 85 Comp A Surface-tolerant Universal Epoxy, Component A | 16 | 20 |
| Jotamastic 85 Comp B Surface-tolerant Universal Epoxy, Component B | 4 | 5 |
The packaging sizes above are typical reference sizes for factory batch production. Due to regional regulatory differences, packaging sizes and capacities may vary by region.
Store in accordance with national regulations. Keep containers in a dry, cool, well-ventilated place away from heat and sources of ignition. Keep containers tightly closed. Handle with care.
| Jotamastic 85 Comp A Surface-tolerant Universal Epoxy, Component A | 24 months |
| Jotamastic 85 Comp B Surface-tolerant Universal Epoxy, Component B | 24 months |
In some markets, the stated shelf life may be shortened to comply with local legal requirements. The above is the minimum shelf life; thereafter, testing is required to confirm quality remains acceptable.
This product can contribute to green building standard credits. Visit Jotun.com for more information or contact your local JOTUN representative.
EPDs are available at www.epd-norge.no
For professional use only. Applicators and workers must be trained, experienced, capable and equipped to mix, stir and apply the coating correctly in accordance with JOTUN's technical documents. Applicators and workers must wear appropriate personal protective equipment when using this product. This guidance is provided based on current product knowledge. Any proposed modification to suit site conditions must be approved by the responsible JOTUN representative before use.
Read the safety warnings on the container packaging. Use in well-ventilated conditions. Avoid inhaling spray mist and avoid skin contact. In case of accidental splashes on skin, wash immediately with a suitable cleaner, soap and water. In case of eye contact, rinse thoroughly with water and seek medical attention immediately.
When used primarily as a primer or antifouling coating, products may show slight colour variation from batch to batch. Such products, and epoxy products used as topcoats, may chalk when exposed to sunlight.
Gloss and colour retention of topcoats depend on the colour type, the surrounding environment such as temperature and UV intensity, application quality and product type. Contact your local JOTUN office for further information.
The information in this datasheet is based entirely on knowledge gained in our laboratory and in practice. JOTUN products are regarded as semi-finished products, and their use is generally beyond our control. JOTUN therefore guarantees only the quality of the product itself. To comply with local regulations, the product may be adjusted, and we reserve the right to modify the datasheet without further notice.
Users should consult JOTUN for specific guidance on the suitability of the product for their requirements and applications.
In case of any discrepancy between language versions, the English (UK) version shall prevail.
Information is subject to the manufacturer's latest version; the manufacturer's latest TDS prevails.
The technical parameters on this page are taken from the product's original manufacturer technical datasheet, the copyright of which belongs to the manufacturer. If a rights holder considers the presentation inappropriate, contact us for verification and handling.
Packaging specifications and batch lead times are subject to actual availability. PleaseContact Uscontact us for project-based calculation.
The factory item numbers of Jotamastic 85 Low Surface Preparation General Purpose Epoxy are as follows.Item No.is the most accurate form when ordering;Colour/colour codecorresponds to the actual colour (RAL, GSB are colour chart codes);Packaging SpecificationsFactory complete-set specification format. Colors not listed may be ordered against the colour card.
| Item No. | Colour / colour code | Packaging Specifications |
|---|---|---|
| Jotamastic 85 Grey | — | 20 L |
This model has a total of1item numbers, all listed on this page; colours outside the table (including special colours and bulk packaging) can be confirmed by phone, delivery dates are advised according to the factory's current production schedule and stock. In the packaging specification, the "+" indicates the complete-set notation for two-component products (base + curing agent), subject to the factory specification; a "—" in the colour column denotes an auxiliary product, or that the item has no colour code in the factory system.
