Basic Elastomers:

Burning Test of various elastomers

• Nitrile (NBR): It burns with a sooty flame leaving an untolerable smell.
• EPDM: Burns readily with a sooty flame leaving a dry & waxy odour.
• BUTYL (IIR): Burns readily with a phenolic odour and if colour tested sith Pyrolysate, it will give a positive test.
• Neoprene (CR): It burns with a sparkling flame with HCL orour and if tested with Copper (Heat the Copper and touch to the sample) the flame will glow green.
• Fluorocarbon (Fpm): It burns and leaves an acrid HF odour and it can easily be found out due to its higher density than other Elastomers (VITON).
• Natural Rubber (NR): It burns continuously and becomes sticky and leaves a black patch on the holding portion.
• Polyurethene (AU.Eu): It burns and melts leaving drops continuously.
• Silicone (Q.MQ.MVQ): It burns with a white flame giving white smoke (No other Elastomer gives white smoke) smelling like bitter almond.

Ethylene Propylene Dion Rubber (EPDM):

EPDM is a Rubber manufactured as a Co-polymer of Ethylene and Propylene

COMPATIBLE WITH:

• Hot Water and Stream upto + 150^oC, Special Comouns upto + 200^oC
• Brake Fluids on Glycol base upto + 150^oC
• Many Organic and Unorganic Acids
• Cleaning Agents, Natron and Kali-Alkalies.
• Hydraulic Fluids based on Phosphate-Ester (HFD-R)
• Silicone Oil and Grease
• Many Polar Solvents (Alcohol, Ketone, Ester)
• Skydrol 500 and 7000
• Ozone, Ageing & Weather Resistant.

NOT COMPATIBLEWITH:

• Mineral Oil Products (Oil, Grease and Fuel).

Chloroprene (Neoprene) Rubber (Cr):

Chloroprene was the first Synthetic Rubber and shows in general good Ozone, Ageing and Chemical Resistance, acceptable Oil Resistance and good Mechanical Properties over a wide temperature range.

COMPATIBLE WITH:

• Mineral Oil Paraffin base with low DVI e.g. ASTM Oil No.1
• Silicone Oil and Grease
• Water and Water Solvents at low temperatures
• refrigerants (Ammonia, Carbondioxide, FreonO
• Improved Ozone, Ageing and Weather Resistance in comparison with NBR.

NOT COMPATIBLEWITH:

• Aromatic Hydrocarbons (Benzene)
• Chlorinated Hydrocarbons (Trichloroethylene)
• Polar Solvents (Ketone, Ester, Ether, Acetone)

Fluorosilicone Rubber (MFQ):

MFQ contains Trifloropropyl groups next to the Methyl group. The Mechanical and Physical properties are very similar to those of MVQ.

COMPATIBLE WITH:

• As per MVQ plus also compatible with
• Aromatic Mineral Oil (e.g. ASTM Oil No.3)
• Fuels
• Low Molecular Aromatic hydrocarbons (e.g. Benzene, Toluene).

Silicone Rubber (Q.MQ.MVQ):

The term Silicone Rubber covers a large group of materials in which Methyl Vinyl Silicone (MVQ) is the main. Silicone Elastomers as a group have relatively poor Tensile Strength and poor Wear & Tear Resistance. However, they have many Special Properties. Silicone in general has good Heat Resistance upto + 230oC and good Cold Flexibility upto -60oC, good Weather Resistance and good Insulating and Physiologically Neutral Properties.

COMPATIBLE WITH:

• SNF Engine Transmission Oil (e.g. ASTM Oil No.1)
• Animal and Vegetable Oil and Grease
• Brake Fluid (Non-petroleum base)
• Fire Resistant Hydraulic Fluid, HFD-S (e.g. Clophene) Cholorodiphenyl (incl. Flame-resistant Insulators, Solutions, Coolants for Tranformers)
• Water upto + 100oC 8 Diluted Salt Solutions
• Ozone, Agening and Weather Resistant.

NOT COMPATIBLEWITH:

• Superheated Water/Steam over + 120^oC
• Acids and Alkalies
• Silicone Oil & Grease
• Low Molecular Chlorinated Hydrocarbons (e.g. Trichloroethylene) Aromatic Mineral Oil
• Fuels
• Aromatic Hydrocarbons (e.g. Toluene).
• Fuels with high Aromatic contents (for Super Fuels a Special Compound must be used)
• Aromatic Hydrocarbons (Benzol)
• Chlorinate (Trichloroethylene)
• Polar Solvents (Ketone, Acetone, Acetic Acid, Ethyelene, Ester)
• Strong Acids
• Brake Fluids on Glyson base
• Ozone, Ageing & Weather Resistant.