there seems to be several different methods of producing body kits (NR ,poly etc.) can someone explain the diff. and advantages of each ,can't seem to find any references, Thanks

 

Here is a bit of info here.....read through...
Found this on a site...hope it helps!


The FRP Composite material is weather proof. It will not reduce in size or bulge during weather changes. A Urethane body kit does not withstand severe weather as well as FRP Composite. Urethane can expand and soften on hot days causing paint to crack or peel. FRP Composite is easy to paint because paint works well with this material if properly prepped. Painting can be difficult with Urethane because paint does not stick well to the material. Urethane is also around 3 times heavier than that of FRP Composite. Poly-Urethane material is practically unbreakable, whereas FRP Composite can crack or chip due to wear.

FRP Composite is extremely light and is very strong according to its weight/strength ratio. The more pieces weigh the slower the speed of your car. Also, FRP Composite material is easily fixable, if such is needed. Whereas, Urethane is unfixable; if parts are damaged they cannot be fixed, but damage rarely happens. Both FRP Composite (DuraFlex) and Poly-Urethane materials are highly recommended and have great qualities for your aftermarket body kit needs.



Stacy

 

I see they use an acronym of PUR. Could that be urethane? I would hope at their prices and the fact that they are TUV products it would be made from the best available materials.

 

PUR RIM stands for Polyurethane Reaction Injection Molding. Here's some info I found on the web:

Unlike PUR , this sort of plastic is produced with a special plastic treatment, called "Reaction-Injection Molding". The RIM process is based on the injection of the two polyurethane components (a polyol and an isocyanate) inside a mould cavity. That's the same plastic automotive manufacturers use. Reaction Injection Molding is the answer when more than one copy is required. Large, functional parts can be produced within short lead times and at very competitive prices. The RIM materials allow prototyping and small series production of lightweight and mechanically functional products. PUR-RIM Systems are the group of polyurethanes that serve to produce highly compact, rigid-elastic mostly thin-walled products, often strengthened by means of mold components.


Advantages:

• The best material for body parts application because it's the most resistant to curb hits
• The most flexible so therefore can take the most abuse; essential if your car is low enough to become friendly with pot holes and curbs
• Excellent fitment
• Strength
• Rebound
• Impact absorption
• Shape retention
• Weather resistance

Disadvantages:

• Heavy
• Difficult to repair
• The body parts will still nearly always need professional fitting but do not require the finishing off that

 

Great Posts guys...