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GFRC Processing FAQs 

So what is it that makes RimCraft's GFRC Machines so much better than others in the market

RimCraft knows your business, your material and your issues well enough to have designed out

typical stumbling blocks found in other manufacturer's machines.


Q: How is the RimCraft Gypsum Spray Equipment Designed, Engineered, and Constructed for concrete processing?

A: The concrete and glass fiber are abrasive and corrosive materials that require compatible fluid passages made from Stainless Steel. RimCraft does not use conventional plumbing fittings that are made of steel for these reasons. All fluid passages are meticulously streamlined to eliminate any shoulders, ridges and sharp corners, allowing for smooth unobstructed flow and easy clean-out.


Q: How does the RimCraft GFRC Spray System process AR Glass Fiber?

A: In the Premix configuration, this unit will spray up o 3% of ¾” AR Glass chopped strand through either the Premix/Backer Wand Gun or Apollo Gun. In the Chopper configuration, this unit will spray continuous strand AR Glass Roving along with a concrete slurry through either a Concentric Gun or an External Mix Chopper Gun.


Q: Why use a Peristaltic Hose Pump instead of a Piston, Diaphragm or Rotor/Stator Pump?

A: RimCraft uses a peristaltic hose pump for it's ability to pump abrasive and corrosive materials. The slurry passages are engineered in such a way as to provide total residual-free cleanouts. Rotor/Stator Pump create too much friction which causes premature curing of Concrete.

RimCraft GFRC Spray System peristaltic pumps are:

* Seal less Dry-Running Self-Priming to 27'

* Abrasion Resistant Reversible Rotation

* Metering Accuracy to ±1%

* Integral Conventional Gear Drives


Q: How does a peristaltic hose pump work?

A: Peristaltic pumps work using the process of peristalsis to pump products through a hose the same way that blood and oxygen are pumped around the body.

* The hose sits around a rotor which, when turning, compresses a segment of the hose almost flat.

* This compression is released as the rotor moves around the hose with the hose reinforcements causing it to spring back to its round shape, thus creating a partial vacuum refilling the hose.

* This compression creates a seal and, as the rotor turns, any product on the discharge side of the rotor is propelled forward and displaced from the pump.

* Combining this suction and discharge action results in a self-priming positive displacement pump.

Q: How is the RimCraft GFRC Spray System different from other marketed Concrete equipment?

A: Most of the other equipment on the market that is being presented as GFRC processing equipment is lacking in technology. They typically work for the first few batches, then it becomes a high maintenance and troublesome piece of equipment.


RimCraft researched the environments that the GFRC Spray Systems had to operate in when we started to design our system. The system would be in water prone areas at all times, must require little to no maintenance and flush quickly and easily with no disassembly of components. All components must be laid out for easy inspection and access. The system must be USER FRIENDLY! With all of this in mind, RimCraft set out to engineer a TRUE GFRC PROCESSING SYSTEM!


RimCraft tested several pumps before designing its own current model, the RimSpray 1 1/4" Peristaltic Hose Pump.

* The entire system can be flushed with less than 8 gallons of water and in less than 10 minutes.

* RimCraft GFRC Spray Guns are modular in design. The spray nozzles are CNC Machined from Stainless Steel to provide long life. (Competitor's are typically machined from a soft aluminum material.)

* The pneumatic and electric components are protected from the elements by a watertight fiberglass control box enclosure.

* All fittings, clamps, fluid passageways are engineered and manufactured from Stainless Steel and certain plastics for corrosion resistance.

* The system is powered by a 2 hp (1.5 kw) AC Motor set up for the customer's power requirements.

* RimCraft uses Direct Drive Gear Boxes and Motors to power the peristaltic pump. (Others use a chain drive to power their pumps which is prone to rust and slurry build-up, causing it to pop off. The chain is usually located in a position that makes it almost impossible to lubricate and is a maintenance nightmare when the chain pops off.)

* All electrical components on the RimCraft GFRC Spray System are sealed from water and can be washed down.

* All fasteners (including the nuts and bolts) are Stainless Steel to resist corrosion.


Q: Can the RimCraft GFRC Spray System spray Concrete slurries that have aggregate mixed in them, such as sand?

A: Yes, all of RimCraft GFRC Spray Systems can spray Concrete slurries with sand. However the RimCraft Spray System is better suited for this application, due to the stronger pump hose and larger pump size. It is recommended to use a polymer modifier. The polymer keeps the sand in suspension. Consult your GFRC sales representative for more information.


Q: Does RimCraft offer training and setup?

A: YES, when required! When a customer purchases a RimCraft GFRC Spray System we want them to get a fast return on their investment so we can set up training at our facility with your machine.


Q: Does RimCraft build custom GFRC Processing Systems?

A: Yes. RimCraft has produced GFRC Systems that were completely PLC controlled and built in mixer. Various chassis configurations and boom lengths. Please see our Custom Equipment Page to view pictures of these system. We will build to suit YOUR NEEDS!

Q: Is there somewhere I can find out about pricing?

A: Yes. Please see OUR PRICING PAGE for some information. However, since we will build to suit your needs, please fill out our CONTACT FORM so we understand what those needs are!

Peristolic Hose Pump
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