Loctite Green High Strength, Retaining Compound 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide,
- RS Stock No.:
- 8211425
- Mfr. Prt No.:
- Loctite 638
- Brand:
- Loctite
Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
EU Directives 2011/65/EU and 2015/863 restrict the use of the 10 substances below in the manufacture of specified types of electrical equipment.
Whilst this restriction does not legally apply to components, it is recognised that component “compliance” is relevant to many customers.
RS definition of RoHS Compliance:
- The product does not contain any of the restricted substances in concentrations and applications banned by the Directive,
- and for components, the product is capable of being worked on at the higher temperatures required by lead–free soldering
The restricted substances and maximum allowed concentrations in the homogenous material are, by weight:
| Substance | Concentration |
| Lead | 0.1% |
| Mercury | 0.1% |
| PBB (Polybrominated Biphenyls) | 0.1% |
| PBDE ( Polybrominated Diphenyl Ethers) | 0.1% |
| Hexavalent Chromium | 0.1% |
| Cadmium | 0.01% |
| DEHP (Bis (2-Ethylhexl) phthalate) | 0.1% |
| BBP (Benzyl butyl phthalate) | 0.1% |
| DBP (Dibutyl phthalate) | 0.1% |
| DIBP (Diisobutyl phthalate) | 0.1% |
The supplier of the item listed below has informed RS Components that the product is "RoHS Compliant".
RS Components has taken all reasonable steps to confirm this statement. Information relates only to products sold on or after the date of this certificate.
| RS stock number | 8211425 |
| Product description | Loctite Green High Strength, Retaining Compound 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, |
| Manufacturer / Brand | Loctite |
| Manufacturer part number | Loctite 638 |
RS Components Ltd, Birchington Road, Corby, Northants, NN17 9RS, UK
Statement of Conformity
This statement confirms that the product detailed below complies with the specifications currently published in the RS media and has been subject to the strict quality conditions imposed by RS Components’ internal management systems. Furthermore and where applicable, it confirms that all relevant semiconductor devices have been handled and packed under conditions that meet the administrative and technical requirements of ANSI/ESD S20.20 and EN61340-5-1 electrostatics control standards.
| RS stock number | 8211425 |
| Product description | Loctite Green High Strength, Retaining Compound 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, |
| Manufacturer / Brand | Loctite |
| Manufacturer part number | Loctite 638 |
The foregoing information relates to product sold on, or after, the date shown below.
RS COMPONENTS
| Date | Nov 8, 2024 |
RS Components Pte Ltd Robinson Road, P.O. Box 1582, Singapore 903132
Country of Origin: IE
Product Details
Threadlocking and Retainers
Loctite 638 High Strength Retaining Compound
Loctite 638 is a high strength retaining compound designed for the bonding of cylindrical parts where the bond gaps can approach 0.25 mm. The compound is used to fill the inner space between components and close-fitting metal surfaces. Loctite 638 cures in the absence of air to form a strong precision assembly and prevents loosening and leakage caused by shock and vibration.
Note
Testing should be carried out prior to contact with styrene, acrylic and polycarbonate based plastics to ensure compatibility.
What is a Retaining Compound?
A retaining compound is an anaerobic adhesive that can secure bearings, bushes and cylindrical parts into housings or onto shafts. The compound is applied as a liquid and is used to fill in the inner spaces of components forming a 100% contact between mating metal surfaces. Once cured the retaining compound forms a strong precision assembly
What Are The Benefits of a Retaining Compound?
A retaining compound helps to achieve maximum load transmission capability and uniform stress distribution. Micro movements between parts are eliminated to prevent component damage and fretting corrosion which reduces the need to purchase costly replacement parts
Features and Benefits of Loctite 638
• Robust curing performance
• Works on active metals such as mild steel
• Works on passive substrates such as stainless steel and plated surfaces
• High temperature performance
• Tolerates minor surface contaminations from oils including cutting, lubrication, anti-corrosion and protection fluids
• Single component, quick and easy to apply
• Ideal for shafts, gears, pulleys and similar cylindrical parts
• DVGW Approval (EN 751-1): NG-5146AR0619
• WRAS Approval (BS 6920): 0511518
Applications
Loctite 638 retaining compound offers a high resistance to dynamic, axial and radial loads. This feature makes Loctite 638 ideal for bonding cylindrical fitting parts, shafts, gears, pulleys and locking bushing and sleeves into housings and onto shafts.
Specifications
| Attribute | Value |
| Brand | Loctite |
| Trade Name | Loctite 638 |
| Application | Bonding |
| Anaerobic | Yes |
| Colour | Green |
| Chemical Ingredients | 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, Dimethacrylate Ester, Hydroxyalkyl Methacrylate, Methacrylate Monomer, Methacrylic Acid, Polyglycol Dimethacrylate, Polyurethane Methacrylate Resin |
| Product Form | Liquid |
| Package Type | Bottle |
| Package Size | 10 ml |
| Cure Time | 1 week, 7 days, 15 min, 24 h |
| Strength | High |
| Maximum Operating Temperature | +150 °C |
| Minimum Operating Temperature | -55 °C |
| Chemical Composition | 2-Hydroxyethyl Methacrylate, Acrylic Acid, Cumene Hydroperoxide, Dimethacrylate Ester, Hydroxyalkyl Methacrylate, Methacrylate Monomer, Methacrylic Acid, Polyglycol Dimethacrylate, Polyurethane Methacrylate Resin |
| Operating Temperature Range | -55 → +150 °C |
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