Date Published:May. 10. 2016
Chemical Resistance of Chemical-proof Screws
Chemical Resistance of Chemical-proof Screws
- A test piece was used to acquire the test data.
- Chemical resistance changes with performance conditions.
Always carry out tests under performance conditions similar to actual conditions in advance.
Teflon*coating's chemical resistance
Chemical name | Temperature (℃) |
Teflon*coating SNSS-TF(Hex Socket Head Cap Screws - Teflon Coating) SNHS-HTF(Hex Head Screws - Teflon Coating for Head) SWS-HTF(Seal Washers - Teflon Coating) |
---|---|---|
10% hydrochloric acid | 25 | ◎ |
50 | ◎ | |
75 | ◎ | |
10% nitric acid | 25 | ◎ |
70 | ◎ | |
30% sulfuric acid | 25 | ◎ |
70 | ◎ | |
10% sodium hydroxide | 25 | ◎ |
70 | ◎ | |
10% ammonium hydroxide | 25 | ◎ |
70 | ◎ | |
Acetone |
25 | 〇 |
50 | 〇 | |
Carbon tetrachloride |
25 | 〇 |
50 | 〇 | |
95% ethyl alcohol | 25 | ◎ |
50 | ◎ | |
Ethyl Acetate |
25 | 〇 |
50 | 〇 | |
Toluene |
25 | 〇 |
50 | 〇 | |
Benzene |
78 | 〇 |
- ◎:No erosion confirmed
- 〇:Slight erosion confirmed
*Teflon is a registered trademark of DuPont.
Chemical resistance of Inconel*, Hastelloy**, and nickel
Chemical name |
Temperature |
Inconel* | Hastelloy** | Nickel |
---|---|---|---|---|
Dilute sulfuric acid |
Room temperature |
A | AA | A |
Boiling point |
D | A | D | |
Concentrated sulfuric acid |
Room temperature |
C | AA | C |
Boiling point |
D | D | D | |
Dilute hydrochloric acid |
Room temperature |
B | AA | A |
Boiling point |
D | D | D | |
Concentrated hydrochloric acid |
Room temperature |
D | AA | D |
Boiling point |
D | B | D | |
Dilute nitric acid |
Room temperature |
D | AA | D |
Boiling point |
- | AA | D | |
Concentrated nitric acid |
Room temperature |
A | AA | D |
Boiling point |
- | D | D | |
Dilute phosphoric acid |
Room temperature |
AA | AA | AA |
Boiling point |
- | AA | D | |
Concentrated phosphoric acid |
Room temperature |
AA | AA | AA |
Boiling point |
- | B | D | |
Sodium hydroxide (weak) |
Room temperature Boiling point |
AA | - | AA |
Boiling point |
C | - | AA | |
Sodium hydroxide (concentrated) |
Room temperature |
AA | - | AA |
Boiling point |
C | - | AA |
- AA : Highly Excellent
- A : Very Good
- B : Satisfactory
- C : Limit
- D : Not satisfactory
Screws of special materials including Inconel*, Hastelloy** and nickel are available.
* Inconel is a registered trademark of Special Metals Corporation.
**Hastelloy is a registered trademark of Haynes.
Titanium's chemical resistance
Chemical name |
Composition (%) | Corrosion-resistant |
|
---|---|---|---|
Pure Titanium |
SUS304 | ||
Hydrochloric acid |
10 | 〇 | × |
30 | × | × | |
Sulfuric acid |
10 | △ | - |
50 | × | × | |
Nitric acid |
10 | ◎ | ◎ |
50 | ◎ | ◎ | |
Aqua regia (HCI:HNO3) |
3:1 | ◎ | × |
Chromic acid |
5 | ◎ | - |
Hydrofluoric acid |
5 | × | × |
Phosphoric acid |
50(ventilation) | △ | ◎ |
Ferric chloride |
10 - 30 | ◎ | × |
Copper chloride |
10 - 30 | 〇 | × |
Sodium chloride |
10 - 40 | ◎ | 〇 |
Calcium chloride |
50 | ◎ | 〇 |
Ammonium chloride |
40 | ◎ | - |
Magnesium chloride |
40 | ◎ | 〇 |
Ferrous sulfate |
10 - 50 | ◎ | 〇 |
Ammonia |
10 - 30 | ◎ | ◎ |
Sodium hydroxide |
50 | ◎ | ◎ |
Sodium carbonate |
10 | ◎ | ◎ |
Hydrogen sulfide |
Dry gas |
◎ | △ |
Moist gas |
◎ | 〇 | |
Chlorine |
Dry gas |
× | - |
Moist gas |
◎ | - | |
Sulfurous acid gas |
Dry gas |
◎ | - |
Moist gas |
◎ | - | |
Seawater |
High flow rate |
◎ | - |
Formic acid |
10 - 50 | 〇 | 〇 |
Lactic acid |
50 | ◎ | 〇 |
Oxalic acid |
20 | × | - |
Citric acid |
10 - 50 | ◎ | 〇 |
Test temperature: Normal temperature
- ◎:<0.127 mm/year
- 〇:0.127 - 0.508 mm/year
- △:0.508 - 1.27 mm/year
- ×:>1.27 mm/year
Titanium screws are available.
Ceramic's chemical resistance
Chemical name |
Temperature |
Time |
Effect |
---|---|---|---|
35% hydrochloric acid | Boiling |
30 minutes | ◎ |
70% nitric acid | Boiling |
30 minutes | ◎ |
98% sulfuric acid | Boiling |
30 minutes | ◎ |
90% phosphoric acid | Boiling |
30 minutes | 〇 |
60% hydrofluoric acid | 20℃ | 24 hours | △ |
10% potassium hydroxide | 80℃ | 7 days |
◎ |
Potassium hydroxide |
500℃(boiling) | 24 hours | △ |
Sodium hydroxide |
500℃(boiling) | 24 hours | 〇 |
Sodium carbonate |
900℃(boiling) | 24 hours | 〇 |
Sodium sulfate |
1000℃(boiling) | 24 hours | ◎ |
Potassium fluoride |
90℃(boiling) | 4 hours |
× |
- ◎:No erosion confirmed
- 〇:Minor erosion
- △:Medium erosion
- ×:Major erosion
Ceramic screws are available.
Resin's chemical resistance
Chemical name |
PTFE | PEEK | VESPEL® SP-1 |
VESPEL® SCP-5000 |
PPS | H-PVC | RENY | PC | PP | PVDF |
---|---|---|---|---|---|---|---|---|---|---|
10% hydrochloric acid | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 | × | 〇 | 〇 | 〇 |
10% sulfuric acid | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 | × | 〇 | 〇 | 〇 |
50%sulfuric acid | 〇 | × | × | △ | × | 〇 | × | △ | - | 〇 |
10% nitric acid | 〇 | 〇 | △ | △ | 〇 | 〇 | × | 〇 | 〇 | 〇 |
50% nitric acid | 〇 | × | × | × | × | △ | × | △ | - | 〇 |
10% hydrofluoric acid | 〇 | - | △ | △ | △ | △ | × | 〇 | 〇 | 〇 |
50% hydrofluoric acid | 〇 | × | × | × | × | △ | × | △ | △ | △ |
Phosphoric acid |
〇 | 〇 | - | - | △ | 〇 | × | 〇 | 〇 | 〇 |
Formic acid |
〇 | △ | △ | △ | 〇 | △ | × | 〇 | 〇 | 〇 |
Acetic acid |
〇 | 〇 | 〇 | 〇 | 〇 | 〇 | × | 〇 | 〇 | 〇 |
Citric acid |
〇 | 〇 | 〇 | 〇 | 〇 | 〇 | △ | 〇 | 〇 | 〇 |
Chromic acid |
〇 | 〇 | - | - | △ | 〇 | × | 〇 | 〇 | 〇 |
Boric acid |
〇 | 〇 | 〇 | 〇 | 〇 | 〇 | △ | 〇 | 〇 | 〇 |
Methyl alcohol |
〇 | 〇 | △ | △ | 〇 | 〇 | - | △ | - | 〇 |
Glycol |
〇 | 〇 | 〇 | 〇 | 〇 | - | - | 〇 | - | - |
Ammonia |
〇 | 〇 | × | △ | 〇 | 〇 | 〇 | × | 〇 | 〇 |
10% sodium hydroxide | 〇 | 〇 | × | △ | 〇 | 〇 | 〇 | - | 〇 | 〇 |
10% potassium hydroxide | 〇 | 〇 | × | △ | △ | 〇 | 〇 | × | 〇 | 〇 |
Calcium hydroxide |
〇 | 〇 | - | - | △ | 〇 | × | 〇 | 〇 | 〇 |
Water |
〇 | 〇 | 〇 | 〇 | 〇 | 〇 | △ | 〇 | 〇 | 〇 |
Hydrogen sulfide (gas) |
〇 | 〇 | - | - | 〇 | - | 〇 | 〇 | 〇 | 〇 |
Sulfur dioxide |
〇 | 〇 | - | - | △ | - | 〇 | 〇 | 〇 | - |
Ammonium nitrate |
〇 | 〇 | - | - | 〇 | - | 〇 | 〇 | 〇 | 〇 |
Sodium nitrate |
〇 | 〇 | - | - | 〇 | - | 〇 | × | 〇 | 〇 |
Calcium carbonate |
〇 | 〇 | - | - | 〇 | - | 〇 | × | 〇 | 〇 |
Calcium chloride |
〇 | 〇 | - | - | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 |
Magnesium chloride |
〇 | 〇 | - | - | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 |
Magnesium sulfate |
〇 | 〇 | - | - | 〇 | - | 〇 | 〇 | 〇 | 〇 |
Zinc sulfate |
〇 | 〇 | - | - | 〇 | - | 〇 | 〇 | 〇 | 〇 |
Hydrogen peroxide |
〇 | 〇 | △ | △ | △ | 〇 | △ | 〇 | 〇 | 〇 |
- 〇:Available
- △:Available depending on the conditions
- ×: Cannot be used
This is test data with a specimen used at room temperature (23°C).
Plastic screws of various chemical-resistant materials are available.
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