Graco ExactaBlend® Vs. HG 437 Big Bear: Which Pump Is Right for You?

Table of Contents

• Graco ExactaBlend Overview
• HG 437 Big Bear Overview
• Side-by-Side Comparison
• Ideal Applications
• How to Decide
• FAQs

Dispensing systems play a critical role in production, but dispensing two-part or high-viscosity materials presents challenges. Consistent ratio control and dependable output are both needed to get the right results. If you are not using the best equipment for the job, your throughput and efficiency could suffer.

Some manufacturers currently rely on the Graco ExactaBlend for their two-component dispensing or are considering this system for their needs. At the same time, other operators are evaluating alternatives such as the HG 437 Big Bear. In this guide, we compare the Graco ExactaBlend and HG 437 pumps, including their specifications, pros, and cons, to help you determine which system is the best fit for your needs.

Graco ExactaBlend Overview

The ExactaBlend Advanced Glazing Proportioner (AGP) from Graco is a variable ratio dispensing system designed for the on-ratio metering and mixing of two-component adhesives and sealants. It is most commonly used in glass glazing applications, including curtainwall and insulated glass installation.

The ExactaBlend pump has an electronic control system and optional data reporting to give you more insights and control in your dispensing. The system will also automatically shut off if off-ratio conditions are detected. This setup prevents improper dispensing as well as wasted material.

HG 437 Big Bear Overview

The HG 437 dispensing system, also called the Big Bear, is another high-volume meter mix system for the dispensing of two-component materials. It is often used with high-viscosity materials and is considered a trusted system for different glass glazing applications.

Unlike the ExactaBlend, the HG 437 glazing pump is a fixed-ratio system that is solely pneumatically powered. This design eliminates electronic controls and is meant to promote mechanical simplicity for operators and maintenance technicians. Along with being all pneumatically powered, the system is mounted on a steel cart for mobility. It also features an external mix, purgeless applicator to help reduce material waste and cleanup time.

Side-by-Side Comparison of the ExactaBlend Vs. the HG 437

Because the ExactaBlend and the Big Bear are often used for the same applications, it can be hard to know exactly which one is right for you. Our team created the chart below that highlights some product specifications and compares the ExactaBlend and the HG 437 dispensing systems side by side.

Both systems are designed for two-component material dispensing and are compatible with higher viscosity sealants and adhesives. They are also both commonly used in structural glazing applications. Because they have many similarities, your choice of system will come down to their differences.

Power

One of the most noticeable differences between the ExactaBlend and the HG 437 is how the system is powered. The Graco ExactaBlend glazing pump has electronic and pneumatic requirements for operation. On the other hand, the HG 437 silicone dispensing system is an all-pneumatic dispenser.

Some manufacturers like an electronic setup because it means added capabilities for more programmability and control. Other manufacturers prefer pneumatic power for its simplicity. Pneumatically-powered systems also tend to have more mobility and can sometimes be better suited for remote field work.

Ratio Setup

The ExactaBlend and the HG 437 dispenser also have different ratio setups. While the ExactaBlend pump is a variable ratio system, the Big Bear is a fixed ratio system. Compared to fixed ratio dispensing systems, variable ratio systems allow operators to easily adjust mix ratios without changing hardware and are best for production environments where ratio changes are frequent.

If you are dispensing the same ratio throughout your production run, then a variable-ratio system is usually unnecessary. The fixed-ratio configuration of the HG 437 ensures the unit operates at a single, preset ratio during production.

Mobility & Portability

A potential benefit of the HG 437 dispensing system is its mobility. The HG 437 dispenser is mounted on a steel cart fitted with wheels that allow you to move it around the production floor as needed. By comparison, many ExactaBlend pump installations are stationary. The HG 437 pump also has a six-foot boom available with approximately 180 degrees of rotation. That added reach gives operators greater coverage without repositioning the entire unit.

Because the HG 437 is all pneumatic, it is suitable not only for plant environments but also for certain field applications. Coupled with the fact that transporting electronically controlled systems often requires additional care to protect sensitive components, the HG 437 may be the better choice for field work. Of course, the ExactaBlend is great for fixed production lines that do not require equipment repositioning.

Lifetime Ownership Cost

Another important factor to consider when deciding between the Graco ExactaBlend and the HG 437 is price. You will want to look at the initial cost of the system as well as long-term operating expenses, including maintenance and service costs.

If you are looking for a reliable system to pump high-viscosity, two-component materials, the HG 437 is a great choice. Because of its simple design, the elimination of electronic components may help decrease costs related to maintenance or replacement parts. On the other hand, the ExactaBlend offers additional capabilities that can justify a higher investment if your application is more involved or you need real-time monitoring.

Do not forget that when a dispensing system goes down, you have the added costs of idle labor, delayed production, and potential missed deadlines. When looking at total cost, you will want to consider replacement part lead times, access to technical support, and in-house maintenance.

Ideal Applications

When you are dispensing high-viscosity, two-component sealants or adhesives, your equipment choice can directly impact your productivity, performance, and overall operating costs. While both are capable of delivering consistent ratio control and high outputs, their differences are what matter in your real-world performance.

Consider the Graco ExactaBlend AGP over the HG 437 if:

• You value added controls and real-time monitoring
• You need variable ratio control
• You already have internal support and expertise
• You have fixed production lines that do not require equipment repositioning

Consider the HG 437 as an alternative to the Graco ExactaBlend if:

• You value simplicity and do not need all the bells and whistles of electronic controls
• You need better mobility and reach
• Your operators are not familiar with the complexities of electronic controls
• You are not changing the ratio frequently during production
• You do not want to spend a lot on maintenance and spare parts for electronic components

How to Decide Between the ExactaBlend and the Big Bear

Choosing the right glazing system requires a structured approach. We recommend walking through the following steps with your production and maintenance teams.

1. Evaluate your current pain points.
   Identify whether downtime, service delays, electronic issues, or material waste are your primary concerns.

2. Confirm your mix ratio requirements.
   If you consistently run one silicone at a fixed ratio, a dedicated fixed-ratio system may simplify operations.

3. Review your shop layout.
   Determine whether mobility and extended hose reach would improve workflow.

4. Analyze total cost of ownership.
   Consider upfront equipment cost, parts pricing, waste reduction, and service accessibility.

5. Assess internal maintenance capabilities.
   Decide whether your team prefers electronic diagnostics or mechanical systems that are easier to service.

By working through these steps, you can align equipment selection with your real-world operational needs.

Want to Learn More?

Both the Graco ExactaBlend and the HG Model 437 Big Bear support high-volume dispensing of two-component, high-viscosity materials. The right choice depends on your operation and priorities.

At the end of the day, your dispensing system should support production rather than interrupt it. Our team can help you evaluate your current setup, compare performance metrics, and determine which system aligns with your long-term operational goals. Just contact us.