1. Materials common in China and their combinations for shoes:
1.1. Common outsole materials in China
1.1.1, what is RB
RB is an abbreviation of English rubber (rubber). Rubber includes natural rubber and synthetic rubber. Rubber: Used to make outsole of various sports shoes. It is a wear-resistant rubber outsole used in outdoor hiking shoes. The most famous is Vibram sole.
1.1.2 what is PU
PU Polyurethane Polyurethane Synthetic, a durable, high-density foam rubber material often used in heel midsole.
1.1.3 what is PVC
polyvinyl chloride polyvinyl chloride, natural color light yellow translucent, shiny. Whitening occurs at fold.
1.1.4, what is TPU
The full name is thermoplastic polyurethane elastomer (thermoplastic polyurethane), which is a linear polymeric material obtained by joint reaction of a diisocyanate, a macromolecular polyol and a chain extender.
1.1.5 what is TPR
Thermoplastic rubber (thermoplastic rubber) is a material that combines properties of rubber and thermoplastics. It has properties of rubber and can be processed and recycled like thermoplastics. It can be injection molded or extruded on conventional plastic injection machines. , Blow molding for manufacture of rubber products. Brother Toughness Note: TPR is now synonymous with low grade TPE in market. In some places, if it is TPE with SBS as main material, it is called TPR.
1.1.6 what is TR
The TPE rubber synthetic material has different characteristics of appearance, good touch, bright color, high smoothness, high technical content, etc., and can be 100% recycled, which is an environmentally friendly shoe sole material. Toughness Brother Note: Depending on reason, TR should be an abbreviation of TPR. Here it is TPE, so it is TPE with SEBS as base material, or it should be TPV (PP/EPDM material). ) Actually first TPV is called TPR.
1.1.7 what is EVA
1.2. Outsole Material Combination
1.2.1, Combination of RB, EVA, TPU, Air Cushion and Cleats
RB+EVA=MD, RB+EVA+airbag, RB+EVA+strut,
RB+EVA+TPU, RB+EVA+TPU+air cushion, RB+EVA+TPU+Stand.
Value 1.2.2, MD, EVA sole
MD: collectively referred to as MODEL or PHILO flying dragon;
Correction: MD is an abbreviation for MOLDED, which stands for Molded Combination EVA Rubber Outsole, but actual EVA material may not fit.
Toughness Brother Note. Actually MD is name of molding process, but it is usually used tolike an EVA sole combination, and EVA is name of material.
PHYLON: (commonly known as Feilong) is a material used to make soles. The midsole used in shoe industry is a mixture of heated and compressed EVA foam (a secondary product of high pressure molded EVA). Lightweight with good elasticity. and impact resistance, hardness is controlled by foaming temperature. The higher degree of foaming, softer it is.
Generally, MD soles usually contain EVA, and MD soles are also called PHYLON soles,
For example, MD=EVA+RB=EVA+RB+TPR, and sometimes RB+PU shoes.
2. Advantages and disadvantages of different sole materials and a simple comparison
2.1, PU (or PR bottom), commonly known as: PU bottom, generally foamed, is lightest and most wear-resistant, of course, price is also most expensive, PU sole material is easy to recognize , it is very light in hand, and holes on back of the sole are round.
2.2. PVC is commonly known as: plastic bottom, which is heavier than TPR in hand and cheaper than TPR, but quality is not good, especially in winter, it is easy to break. bottom; PVC One of features of material sole is that there are no injection holes, and there is a smell when you feel it with your nose. If left for a long time, white things will grow back. Brother Hardness: Everyone who lived before 1970s has a deep impression. Slippers that are worn in summer are very painful to wear in winter. They are made of PVC material. Of course, current modified PVC material can be made. Also softer.
2.3. TPR outsole is more flexible than PVC. Hold sole firmly and lower it naturally. If it can bounce, it's TPR, but TPR sole is not difficult to age , not very wearable.
2.4, TR outsole has a bright surface. It's harder than a regular TPR outsole. TR has more injection holes than TPR. The injection hole is special. Toughness Brother's note: for reasons this shouldn't happen. If SEBS is used as TR base material, it should be more matte than TPR. If TPV is used, it will be more matte. It is commonly believed that some bovine tendon soles are made of TR material.
2.5, MD bottom, commonly known as: Huailong outsole (PHYLON), bottom is a rubber sheet, and top layer is high elastic EVA, non-slip and lightweight. , At present, first-class brands at home and abroad use this kind of substrate. Brother Resilience Note: It is said to be a first-class brand, it must be obsolete, and now new materials appear one after another, EVA is no longer a good material!
2.6 TPU outsole is a TPU elastomer outsole that usually has a brighter appearance and can also be foamed. As a rule, sole is formed by injection molding, which makes it difficult to grind. . This is different from PU bottom molding method, but raw material is same and, relatively speaking, not as good as PU bottom. At present, more popular popcorn material is made of TPU.
The difference between polyurethane and PVC is relatively simple. From corner, main fabric of polyurethane is much thicker than PVC, and there is also a difference in feel. PU is softer to touch, PVC is harder to touch. burned by fire. , PU taste is much lighter than PVC, and PVC smoke has a halogen taste.
Comparison of other weight, material, process, application
In terms of weight: RUBBER (rubber) is heaviest, PU and EVA are lightest.
Materials: PU is expensive, EVA, TPR are average and PVC is cheapest.
From a technology point of view: TPR is a casting, PVC needs to be machined. ABS is typically a high heel shoe material that is expensive and hard .
Application: PVC is mainly used in lining or non-load-bearing parts or in production of children's shoes; PU leather can be applied to shoe fabric or load-bearing parts. In terms of bags, PVC leather is more suitable. This is due to fact that objects in a bag, unlike legs in shoes, do not radiate heat, do not carry weight of a person. If you need slip protection, one of them is RB rubber outsole, all made of rubber, mainly used for skateboard shoes and casual shoes; other is MD Huailong outsole, which is made of rubber, mainly used for hiking shoes and running shoes. .
3. How to identify common rubber materials
3.1 SBR synthetic rubber outsole
Solvent identification: all solvents are not sticky after dripping
Identification by burning method: thick black smoke, rubber smell, sticky after burning, not self-extinguishing.
3.2 TPR bottom
Dissolution method identification: dropping point of toluene or ethyl acetate, breaks when folded
Identification by combustion method: dense black smoke, melted at place of combustion, not self-extinguishing.
3.3 PVC bottom
Solvent identification: sticky after cyclohexanone dripping, insoluble in acetone
Identification by burning method: when burning, smell of plastic is felt, and it will go out on its own after leaving fire; glue some PVC with hot copper wire and then burn it with green flame.
3.4, PU foam bottom
Solvent identification: drop any of cyclohexanone, methyl ethyl ketone and acetone, it will be sticky
Identification by burning method: flame is orange-red when burning and does not go out when away from fire.
3.5 high wear resistant nitrile rubber NBR
Solvent Method Identification: Solvent Resistance
Identification by combustion method: black smoke, red flame.
3.6 EVA midsole
Solvent Method Identification: Solvent Resistance
Identification by combustion method: during combustion there are colloidal streaks, flame is white, has smell of paraffin, is not drawn.
Source: network, R&C team federation
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