301 DOSING PUMPS

What is the West System 301 Dosing Pumps set and why choose it?

The West System 301 Dosing Pumps (also known as 301 Mini Pumps) are a calibrated pump set designed for convenient and accurate dispensing of WEST SYSTEM 105 Epoxy Resin together with the compatible hardeners. Each full stroke of the resin pump and the hardener pump delivers the correct resin-to-hardener ratio, helping to ensure reliable curing and consistent performance of the epoxy system while reducing mess and guesswork during mixing.

Main features

• Complete dosing kit: includes one resin pump, one hardener pump and extension tubes (package configuration may vary by regional pack size; this detail is not fully verified for all markets).
• Calibrated mix ratio: each full pump stroke of resin and each full pump stroke of hardener delivers the correct working ratio for WEST SYSTEM 105 epoxy with its matched hardeners, helping to avoid off-ratio mixes.
• Designed for WEST SYSTEM 105 Resin with 205 Fast or 206 Slow Hardeners (in most standard 301-5 / 301 Mini Pump configurations). Compatibility with other hardeners such as 207 or 209 depends on the specific 301 model and should be verified for each kit.
• Accurate and repeatable dosing: reduces the risk of human error compared to manual volume measurements and supports optimal cured strength and durability of the epoxy.
• Direct container mounting: pumps are designed to screw onto the corresponding WEST SYSTEM resin and hardener containers for clean and direct dispensing.
• Convenient for frequent use: when the epoxy is used regularly, the pumps can usually remain installed on the containers for quick access (practice described in manufacturer literature, but local procedures may vary).
• Helps minimise waste and contamination: controlled dosing reduces spills and contact with the resin and hardener during proportioning.

Technical specifications

Only the following data is confirmed from manufacturer and technical literature; any missing information is not specified here:

• Product type: calibrated dosing pump set for WEST SYSTEM epoxy (301 Mini Pumps).
• Typical application: dispensing WEST SYSTEM 105 Epoxy Resin with compatible WEST SYSTEM hardeners (such as 205 Fast and 206 Slow; other hardeners require specific 301 variants).
• Mix ratio (standard system): pumps calibrated to deliver a resin-to-hardener ratio of 5:1 by weight for WEST SYSTEM 105/205 or 105/206 systems (one full stroke from each pump).
• Dispensing principle: positive-displacement mini pumps for volume-controlled dosing of resin and hardener.
• Mounting method: screw directly onto WEST SYSTEM 105 resin and hardener containers of the corresponding pack size (for example 301A, 301B or 301C, depending on the region and container size). This mapping between pump code and container size may differ by market; exact pairing should be verified.

For any critical technical parameter not listed here (for example exact stroke volume per pump or compatibility with special hardeners in your region), it is recommended to consult the official WEST SYSTEM technical data and product guide for confirmation.

Applications and typical uses

The West System 301 Dosing Pumps are intended as an accessory for WEST SYSTEM epoxy systems and are used wherever accurate manual metering of resin and hardener is required. Common applications include:

• Boatbuilding and marine repair: proportioning epoxy for structural bonding, laminating, sheathing and general repairs using WEST SYSTEM 105/205 or 105/206 systems.
• Composite construction: metering resin and hardener for fibre-reinforced laminates, repairs and custom composite parts with WEST SYSTEM epoxy products.
• Woodworking and joinery: dispensing epoxy for bonding, gap filling and coating wooden components where reliable ratio control is important for long-term durability.
• DIY, hobby and repair tasks: simplifying small- to medium-scale epoxy work such as coating, gluing, repairs and maintenance projects by providing a simple “one pump of resin / one pump of hardener” method.

These pumps are particularly useful for frequent users of WEST SYSTEM epoxy who need consistent results without measuring by weight or volume for every batch.

FAQ – West System 301 Dosing Pumps

1. What are the West System 301 Dosing Pumps used for?

   They are used to accurately dispense WEST SYSTEM 105 epoxy resin and compatible hardeners in the correct mixing ratio, making it easier to prepare batches of epoxy for bonding, laminating, coating and repair work.

2. How do I use the pumps to get the correct mix ratio?

   Once correctly installed, dispense one full stroke of the resin pump and one full stroke of the hardener pump into the mixing container. The pumps are factory-calibrated so that this one-to-one pumping action provides the correct 5:1 resin-to-hardener ratio by weight for standard systems like 105/205 or 105/206.

3. Are the 301 Dosing Pumps compatible with all WEST SYSTEM hardeners?

   No. Standard 301 Mini Pumps are generally intended for 105 resin with 205 or 206 hardeners. Use with other hardeners, such as 207 or 209, depends on the exact 301 variant (for example special-ratio versions) and must be checked against the official product documentation.

4. Can I leave the pumps mounted on the resin and hardener containers?

   According to WEST SYSTEM guidance, the pumps can be left installed on the containers when the products are in regular use, which allows quick dispensing and helps to keep the containers closed and tidy. However, good workshop practice and local safety procedures should always be followed.

5. Do I still need to measure by weight or volume if I use the pumps?

   For typical workshop use, the calibrated pumps are designed so that individual full strokes of resin and hardener will deliver the correct ratio without further measuring. Where exact resin-to-hardener ratios are critical for testing, certification or special formulations, measurement by weight or volume may still be required according to project specifications.

6. How do I know which 301 pump set (A, B, C, etc.) fits my containers?

   The pump set code (such as 301A, 301B or 301C) is related to the size of the WEST SYSTEM resin and hardener containers. Because the mapping can vary by region and packaging, check the container size and confirm the matching pump set in the current WEST SYSTEM product guide or on the packaging.

7. Can these pumps be used with other brands of epoxy?

   The 301 Dosing Pumps are designed and calibrated specifically for WEST SYSTEM 105 resin and its associated hardeners. Using them with other brands or systems may not provide the correct mix ratio and is not recommended unless verified by the manufacturer of the alternative epoxy.

8. How should I clean the pumps after use?

   Manufacturer instructions describe cleaning with suitable cleaning solutions and warm water, avoiding aggressive solvents that may attack the plastic components. Exact cleaning agents and procedures can vary and should be checked in the official WEST SYSTEM pump instructions.

9. What happens if I do not push each pump fully down?

   For best accuracy, each pump stroke should be complete. Partial strokes can disturb the calibrated ratio and may result in off-ratio mixtures, which can affect curing and final properties of the epoxy. This behaviour is inherent to most calibrated dosing pump systems.

10. Where can I find more detailed technical information?

    For precise technical details, safety recommendations and step-by-step instructions, it is recommended to consult the official WEST SYSTEM manuals and product guides for the 301 Mini Pump set and the specific resin/hardener combination you are using.