What it is and why choose it
ALEXSEAL R4042 Epoxy Primer Reducer is a halogen-free blend of organic solvents, designed for professional industrial serial painting. It is specifically formulated to reduce and adjust the application viscosity of ALEXSEAL epoxy primers, such as ALEXSEAL Finish Primer 442, helping to achieve controlled spray characteristics, consistent film build and an even surface.
Main features
- Dedicated epoxy primer reducer – formulated for use with ALEXSEAL epoxy primers, including Finish Primer 442.
- Optimized spray performance – used at 15–25% by volume with Finish Primer 442 to achieve the recommended application viscosity and smooth, uniform films.
- High solvent strength – mixture of organic solvents providing effective reduction of high-solids epoxy primers.
- Fast-evaporating, highly flammable – classified as Flammable Liquid Category 2; supports quick flash-off when applied under recommended conditions.
- Professional-use formulation – intended for controlled industrial environments with appropriate application, ventilation and protective measures.
Technical specifications
- Product type: Organic solvent mixture, halogen-free
- Intended use: Industrial serial painting; reducer for ALEXSEAL epoxy primers
- Appearance: Liquid, colour according to product name
- Odour: Characteristic solvent odour
- Boiling range: Approx. 120 °C
- Flash point: 9 °C (ISO 13736)
- Physical state (20–25 °C, 1,013 hPa): Liquid
- pH (10% solution, 20 °C): 5–7
- Water solubility: Insoluble; immiscible with water
- Vapour pressure: Approx. 100 hPa (50 °C)
- Density: Approx. 0.85 g/cm³ (20 °C)
- Upper explosion limit: 10.0 % (v/v)
- Lower explosion limit: 1.0 % (v/v)
- Auto-ignition temperature: > 400 °C
- Viscosity (kinematic, 10% solution): > 6 mm²/s
- Flow time: < 12 s (4 mm DIN 53211); < 10 s (6 mm ISO 2431)
- VOC content: 100 %, approx. 850 g/L (Directive 2010/75/EU)
- Main solvent components (typical ranges, % w/w):
- n-butyl acetate: ≥ 25 – < 40
- butan-1-ol: ≥ 20 – < 25
- butanone (MEK): ≥ 20 – < 25
- toluene: ≥ 12.5 – < 20
- 1-methoxy-2-propanol: ≥ 5 – < 12.5
- Classification (Regulation (EC) No. 1272/2008):
- Flammable liquids, Category 2 (H225)
- Skin irritation, Category 2 (H315)
- Serious eye damage, Category 1 (H318)
- Reproductive toxicity, Category 2 (H361d)
- Specific target organ toxicity – single exposure, Category 3, respiratory system and central nervous system (H335, H336)
- Specific target organ toxicity – repeated exposure, Category 2 (H373)
- Aspiration hazard, Category 1 (H304)
- Recommended storage temperature: 5–35 °C, in a cool, dry, well-ventilated place away from heat and direct sunlight
Applications and use cases
- Viscosity reduction of ALEXSEAL Finish Primer 442: Used at 15–25% by volume with the mixed base and converter to reach the correct spray viscosity and film build.
- Industrial serial painting processes: Suitable where ALEXSEAL epoxy primers are applied repeatedly under controlled shop conditions.
- Spray applications requiring fine atomization: Supports conventional and HVLP spray setups by helping to achieve the specified viscosity and flow characteristics of the primer.
Mixing and reduction with ALEXSEAL Finish Primer 442
- Standard mixing ratio for Finish Primer 442:
- 1 part by volume ALEXSEAL Finish Primer 442 Base
- 1 part by volume C4427 Finish Primer 442 Converter
- 15–25% by volume R4042 Epoxy Primer Reducer, based on the total of base + converter
- Example for spray application: 1 : 1 : 1/2 corresponds to a 25% reduction.
- Temperature guidance: A slower reducer (R5015 or R4043) is recommended instead of R4042 for temperatures above 20 °C.
- Thin, smooth sealer coats: Finish Primer 442 may be reduced up to 25% where surfacing build is less critical and a smooth sealing coat is desired.
- The exact amount of reducer may vary depending on application conditions.
FAQ
- What is ALEXSEAL R4042 Epoxy Primer Reducer used for?
- It is used to reduce the viscosity of ALEXSEAL epoxy primers, such as Finish Primer 442, primarily for spray application in industrial serial painting.
- How much R4042 should I add to ALEXSEAL Finish Primer 442?
- The technical data sheet for Finish Primer 442 specifies 15–25% R4042 by volume, based on the combined volume of base and converter. A 1 : 1 : 1/2 ratio corresponds to 25% reduction for spray application.
- Can I use R4042 at high temperatures?
- For temperatures above 20 °C, the manufacturer recommends using a slower reducer (R5015 or R4043) instead of R4042.
- Is ALEXSEAL R4042 water-soluble?
- No. It is insoluble and immiscible in water and should be kept away from drains and waterways.
- How should I store this reducer?
- Store in tightly closed containers of the same material as supplied, in a cool, dry, well-ventilated area at 5–35 °C, away from heat sources, direct sunlight, oxidizing agents and strong acids or alkalis.
- Is this product flammable?
- Yes. It is classified as a highly flammable liquid (Flammable Liquid Category 2) with a flash point of 9 °C. Keep away from heat, hot surfaces, sparks, open flames and other ignition sources.
- Can it be used by consumers or DIY users?
- The documentation specifies industrial serial painting and requires adherence to occupational safety regulations. It is intended for professional use with appropriate safety measures.
- Does R4042 contain halogens?
- No. It is described as a mixture of organic solvents, halogen-free.
Section 14 – Transport information
- UN number / ID number: UN 1263
- UN proper shipping name: Paint Related Material
- Transport hazard class: Class 3 (Flammable liquid)
- Packing group: II
- ADR details:
- Classification code: F1
- Hazard identification number: 33
- Label: 3
- Tunnel restriction code: (D/E)
- Special provision: 640D
- IMDG details:
- Class: 3
- Packing group: II
- EMS code: F-E, S-E
- Marine pollutant: No
- IATA details:
- Class: 3
- Packing group: II
- Cargo aircraft packing instruction: 364
- Passenger aircraft packing instruction: 353
- Limited quantity packing instruction: Y341
- Label: Flammable Liquids
- Environmental hazards for transport:
- ADR: Not classified as environmentally hazardous
- IMDG: Not a marine pollutant
- On-site transport note: Within the user’s premises the product must be transported in closed, upright and secure containers. Personnel handling the containers should be familiar with emergency and spill procedures.
Section 8 – Individual protection measures
Engineering controls
- Provide adequate ventilation using local exhaust and general extraction.
- If ventilation does not keep solvent vapours below occupational exposure limits, appropriate respiratory protection must be worn.
Personal protective equipment
- Eye/face protection: Safety goggles providing protection against solvent splashes.
- Hand protection:
- Use chemical-resistant protective gloves tested to EN 374.
- Recommended materials for short-term contact (splash protection): nitrile rubber or neoprene.
- Minimum material thickness: > 0.4 mm; breakthrough time: > 480 minutes.
- Check gloves for suitability at the workplace and replace immediately if damaged or worn.
- Skin and body protection: Wear suitable protective clothing; where explosive atmospheres may occur, use clothing adapted to that risk.
- Respiratory protection:
- If solvent concentration exceeds air limit values, use an approved breathing apparatus.
- Use at least a half-mask with appropriate cartridge or an air-fed respirator.
- When working inside spray booths where ventilation may be insufficient, operators should wear a compressed air-fed respirator during spraying until vapour and particulate levels are below exposure limits.
General protective and hygiene measures
- Do not eat, drink or smoke during use.
- Avoid contact with skin, eyes and clothing.
- Avoid inhalation of sanding dust, particulates and spray mist.
- Use preventive skin protection (skin protection cream) and wash contaminated skin immediately.
*Contenido generado por IA
