This engineer is struggling with identifying validity of following statement:
Is ABS bad with household grease?
Is PVC better with Grease?
Is CPVC better with Grease?
Have you heard of this reaction of ABS with Grease?
What are the reactions of grease and ABS?
I would like to initiate a dialogue among members.
However, I like to give you the lest and their content.
Answer up to now:
Chemical equation of vegetable oil
Fats and oils are biological substances called lipids (chemicals not soluble in water). Fats are solid at room temperature, while oils are liquid. Structural formula of fats and oils contain three ester functional groups. Fats and oils are esters of the tri-alcohol, glycerol (or glycerine) known as triglycerides or triacylglycerols. Source: http://scifun.chem.wisc.edu/chemweek/pdf/Fats&Oils.pdf
In Chemical Resistance Guide, thermoplastic Piping Systems, a 71 page guide by IPEX (http://www.gilsoneng.com/reference/ChemRes.pdf) the result of the chemical resistance of the vegetable oil is as follows:
Table 1
Chemical Resistance Chart of PVC, CPVC, and ABS to Vegetable Oil (by IPEX)
PVC 1 (60 F) 2 (104 F) – (140 F)
CPVC – (60 F) – (104 F) – (140 F)
ABS – (60 F) – (104 F) – (140 F)
RATINGS
1 High Resistance – All materials belonging to this class are completely or almost completely inert when used with the specified chemical at the specified concentration/ temperature levels.
2 Limited Resistance – All materials belonging in this class are partially attacked by the specified chemicals at the specified concentration/temperature levels. Life expectancy is thus shortened and it is recommended to use a higher safety factor than that adopted for Class 1 materials.
3 No Resistance – All materials in this class are severely attacked by the specified chemicals at the specified concentration/temperature levels. They should, therefore, not be used.
The absence of any class indication for any given materials, signifies the absence of data for such material(s) with respect to the specific chemical(s), temperature(s) and concentration(s).
Based on Data above PVC is not acceptable for temperatures at 104 degrees. CPC or ABS have not been tested or at least IPEX has not identified them. This Engineer also is having hard time responding to this question.
THERMOPLASTICS
ABS – (Acrylonitrile-Butadiene-Styrene) is ideal for residential and commercial sanitary (DWV) systems. With a working pressure up to 230 psi, ABS is also suitable for industrial applications such as mine slurry lines. Temperature range is -40°C (-40°F) to 82°C (180°F). ABS is resistant to a wide variety of materials ranging from sewage to household chemicals. It is joined by solvent cementing or threading.
PVC – (Polyvinyl Chloride) is the most frequently specified of all thermoplastic-piping materials. It has been used successfully for over 60 years. PVC is characterized by distinctive physical properties, and is resistant to corrosion and chemical attack by acids, alkalis, salt solutions and many other chemicals. It is attacked, however by polar solvents such as ketones and aromatics. Of the various types and grades of PVC used in plastic piping, Type 1, Grade 1 PVC (Cell Classifications 12454) conforming to ASTM D1784, is the most common. The maximum service temperature for PVC is 60°C (140°F) under pressure and 82°C (180°F) in drainage. With a design stress of 2,000 psi, PVC has the highest long-term hydrostatic strength 22.7°C (73°F) of any other major thermoplastic material used for piping. PVC piping is joined by solvent cementing, threading, flanging, grooving, gasketed joints, or mechanical joints.
CPVC – (Chlorinated PVC) (Cell Classification 23447), conforming to ASTM D 1784 has physical properties at 22.7°C (73°F) similar to those of PVC; its chemical resistance is similar to or generally better than that of PVC. With a design stress of 2,000 psi and maximum service temperature of 93.3°C (200°F), CPVC has proven to be an excellent piping material for hot corrosive liquids, hot and cold water distribution and similar applications above the temperature range of PVC. CPVC piping is joined by solvent cementing, threading, flanging or grooved joints.
PE – (Polyethylene) is a member of the polyolefin group. It is tough and flexible even at subfreezing temperatures. Pipes are generally formulated with only an antioxidant and some pigments, usually carbon black, to screen out ultraviolet radiation. ASTM D 1248 classifies three types. Type I low density, Type II medium density and Type III high density. Pipe is usually made from medium or high density for higher strength and hardness. PE is generally used for gas distribution, water lines and slurry lines.
PEX – (Cross-linked Polyethylene) is high density PE that undergoes a treatment to link single strands of PE through radical reactions between the molecules to form a dense network with up to 80% cross linking. The primary reason to crosslink PE is to raise the thermal stability of the material. Service temperatures are raised to 82°C (180°F). PEX pipe is primarily used for plumbing and radiant floor heating systems.
PP – (Polypropylene) is a lightweight polyolefin and generally high in chemical resistance. Although Type 1 polypropylene conforming to ASTM D2146 is slightly lower in physical properties than PVC, it is chemically resistant to organic solvents as well as acids and alkalis. Generally, polypropylene should not be used in contact with strong oxidizing acids, chlorinated
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